Malicious PDF — malware analysis report

Static analysis result for SHA-256 c1dde755a6d21fbb…

MALICIOUS

PDF

72.1 KB Created: 2021-04-07 22:43:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: e69e831f11b1cb0242d429f2df337301 SHA-1: 3b9a040225a13b19f6f80066486e238ba118cd4d SHA-256: c1dde755a6d21fbb9f16f8ce1ad39e779b41123332ea1a6ce8fcb5c51bfd42c6
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware delivery attempt, likely initiated via a spearphishing attachment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://pelibifir.ru/strik?utm_term=easy+veg+indian+food+recipes PDF link annotation
    • https://rirokenu.weebly.com/uploads/1/3/5/3/135349909/rixofikoxakosuvesa.pdfIn PDF document text
    • https://cdn.sqhk.co/notokulojow/ij9giZn/817766584.pdfIn PDF document text
    • https://ganokupojedozo.weebly.com/uploads/1/3/4/8/134890080/fojozetixulukow.pdfIn PDF document text
    • http://logekolumo.22web.org/84425539339.pdfIn PDF document text
    • https://cdn.sqhk.co/mopomotop/hcyjetF/7148835105.pdfIn PDF document text
    • https://gazelavulokar.weebly.com/uploads/1/3/4/2/134265358/tigujakotak-votobikanu.pdfIn PDF document text
    • https://rowigoto.weebly.com/uploads/1/3/0/8/130813427/nijovawenujimuzojulu.pdfIn PDF document text
    • https://cdn.sqhk.co/wifilivemij/cijeOld/wogomirexutebefodagu.pdfIn PDF document text
    • https://mulibini.weebly.com/uploads/1/3/4/8/134881685/zevoxu_jerufiw_nugofozife.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/fF0cgci/35599925790.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://30de3caf-c510-4ce9-8691-b8280dc60d9b.filesusr.com/ugd/4980ee_ae0dbe5e870946b88620912e720d858c.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a774c1f6-dacb-4be3-872d-4756f7474c72/brothers_sing_on_americas_got_talent.pdfIn PDF document text
    • https://c4a5d104-04f9-44e6-b03f-1f5edac3680f.filesusr.com/ugd/f23921_57f232cbb70c41a6a8ee6b53e5535190.pdf?index=trueIn PDF document text
    • http://satokivobusik.rf.gd/sukuwuguf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7d20d28-9a31-4649-adbd-63eb1350bc90/sobaseriripetumirudu.pdfIn PDF document text
    • http://jugorufu.epizy.com/billboard_hot_100_2015_zip.pdfIn PDF document text
    • https://6c49ff76-e13b-46da-8354-2e633d56f736.filesusr.com/ugd/211c2d_9eee053583fc44b5bbad0559b8ef44ba.pdf?index=trueIn PDF document text
    • https://3e80c8bf-0031-4ca1-bfa9-4484641fefed.filesusr.com/ugd/08103e_a4ed3e1ba201422395b35de88568196b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/c79c1bc0-d570-40a9-bfc1-c16971dc0b64/how_to_check_used_car_before_buying.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_off0000d0bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0BF 5116 bytes
SHA-256: 4dfe9b8aafac224ce6132754b08e49a6214b2b731b81e445fad23fcfb2ed84e2
font_01_sfnt_off0000e23d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23D 10228 bytes
SHA-256: 65d5e86be77ee152d13e779bc3ec7d34243fb866ed212586194b7cca5d1d5970
font_02_sfnt_off0001054c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054C 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3