Malicious PDF — malware analysis report

Static analysis result for SHA-256 9752b5692a35f754…

MALICIOUS

PDF

94.7 KB Created: 2021-05-30 05:52:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 264d2f5c3630ed51605956568fe85c65 SHA-1: d1f356d08917d2139a640f88e1a5daccf931f7cd SHA-256: 9752b5692a35f7547cf7513bd4779bb0346fd3499ab857a822d8936b0c6d4486
244 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded links, many of which point to disposable hosting services and are designed to create a link farm. One critical heuristic indicates that these links lead to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution through these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://dafemum.ru/strik?utm_term=5+times+what+equals+105 In PDF document text
    • https://mamudige.weebly.com/uploads/1/3/0/8/130874639/lavabajob_jekunirexawu_gutarijo_muzaji.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408197/normal_5fcb01dd69897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4386086/normal_5fde490bb9e63.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4385647/normal_60b001955d4da.pdfIn PDF document text
    • https://xufitagetibo.weebly.com/uploads/1/3/4/4/134486135/jopetase-gamel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383334/normal_60351e89d1bb8.pdfIn PDF document text
    • https://jufufowepum.weebly.com/uploads/1/3/5/3/135348100/guniwapex_bijed_jerimonij_wasezatukebifo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501794/normal_5fdaf1e33cc7f.pdfIn PDF document text
    • https://gudivolopuna.weebly.com/uploads/1/3/5/3/135346868/1797946.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_60594bfc7ee2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374189/normal_60494e6186913.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366003/normal_602c62f193d05.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/04cead13-f7db-4d59-806b-66bbe43b3e67/bupulojavomumamukakamus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/45469a71-ea03-4014-9c5e-544fa719ff16/bavebubefegiwor.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/90f41827-1d92-4d48-afdb-de2a5cd453cc/cara_belajar_efektif_dalam_islam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4113d8b5-f6c8-456d-82d3-b90ecdaf62e8/teacher_created_resources_inc_answer_key_7th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f5c9dbd6-90d5-4b6b-bcfa-5bcd9086c83d/garmin_vivosmart_4_manual_espaol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15274739-c160-4979-943e-183b1abe2ce1/what_fast_food_has_gluten_free_bread.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/23aa1515-1f5a-463d-9e8d-151e766992a7/shampoo_solutions_for_oily_hair_target.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cfd8cd8a-0f14-4a66-b9ac-b7c793ab3c89/2058819312.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 7

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6E9 6416 bytes
SHA-256: 9e91590ae502ff902ba306624a00c8d44396a7ee9717b1bfa1717db63fe08483
font_01_sfnt_off0000e6bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BC 4936 bytes
SHA-256: f2f3c897549841efeeffdf65aac2ae5506af4bdb33e3606228e4ee08827ae914
font_02_sfnt_off0000f797.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF797 10868 bytes
SHA-256: 5e2d4e6282afd65b84bf00aca32120ff3057f7e8ffb59a18e33ef2d37f6a387e
font_03_sfnt_off00011a5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A5C 10788 bytes
SHA-256: 06c4bb285d87ba067c324c9d9be1eb78bc5fb818a99a0b6c669a97f08b5cc2b9
font_04_sfnt_off00013f52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F52 16256 bytes
SHA-256: 0c28d55d9957e5be45f9d3302843a1d8772fc4e8a9a81ea04eed1b5cc2016f23
font_05_sfnt_off000154c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x154C0 4324 bytes
SHA-256: 0d0f64e27578eb124b8bc81c7eceacdd166e22eddd95c81328e9fbd7de2a6333
font_06_sfnt_off00016273.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16273 1736 bytes
SHA-256: 5095ccdfdd328c3f25b1766e9c65bca58fa839170fcb9f3db3c20e130d955aff

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