Malicious PDF — malware analysis report

Static analysis result for SHA-256 72da39f7d4ab28c7…

MALICIOUS

PDF

87.1 KB Created: 2021-05-30 03:51:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: a6f0a7ac5013a28f0f0e275b618727dc SHA-1: 440f9e468819e69a69fbfcf190a8c0f78e9f43ae SHA-256: 72da39f7d4ab28c74dbe1eea3d4943d5c8ef47bfd73809c22d2455caedb692c9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristics reveal it contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or SEO manipulation tactic. One of the embedded URLs, https://vilenefex.ru/strik?utm_term=what+is+26th+amendment+in+pakistan+constitution, is likely part of this scheme to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://vilenefex.ru/strik?utm_term=what+is+26th+amendment+in+pakistan+constitution PDF link annotation
    • https://gixeroparot.weebly.com/uploads/1/3/4/5/134586235/3435808.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417808/normal_6028925e3c1a9.pdfIn PDF document text
    • https://rutedidatares.weebly.com/uploads/1/3/4/4/134490949/c0560038f18.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421764/normal_5ff71342266ea.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4450338/normal_60b2bbb965cf0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427509/normal_5fec1f561baf3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414852/normal_6048e065a528a.pdfIn PDF document text
    • https://mitometivu.weebly.com/uploads/1/3/6/0/136094147/7999277.pdfIn PDF document text
    • https://babotiditufo.weebly.com/uploads/1/3/4/6/134694550/bedopifewufut-mibukuwatotu.pdfIn PDF document text
    • https://siwufofewexiv.weebly.com/uploads/1/3/5/3/135329456/jutamufiw-mavopojubobox-zovetosapum-jotutawe.pdfIn PDF document text
    • https://jodawozuwiki.weebly.com/uploads/1/3/1/4/131437728/7947856.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407756/normal_601bf9b87b72f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368763/normal_5fe6c72089c06.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/89c05acb-f826-4027-ae8e-386a8c7a4e2e/jebusiza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/808369cb-caef-4678-a05a-ca5960e81cd6/diwadep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6829728b-0e75-4db7-9a2a-bdf1754471ab/asus_m2a-vm_sound_drivers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cb554fd-c0c1-4e25-8829-bcd47f3196c7/10-11.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ec0ca4-64d4-47cf-bf3c-f555b0f38079/oracle_database_11.2.0.4_download_for_linux_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67eed14f-d1d6-496d-b11c-5ed6ebe456a4/food_chain_worksheet_grade_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eed16c10-6125-4c8c-b9b9-be2cf3541cba/xifedexututu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f22b879-02a5-4957-8e83-67a1fbde999b/graphic_design_software_free_trial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e289777e-d4c5-4a2c-a879-d44d9c1a7ba2/kulojomefewetukimosu.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
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001046a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1046A 5428 bytes
SHA-256: 51f3249fb5badc1b36e1483dd3a1a19237bf5ccbb176f972f1f9ee08950ac829
font_01_sfnt_off000116c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116C1 12868 bytes
SHA-256: f98d3442bb3bebf02f2a51037e3103c019efd1a52ad2655df8b026c5fe235b3d
font_02_sfnt_off0001408d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1408D 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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