Malicious PDF — malware analysis report

Static analysis result for SHA-256 d526ff42b10c322a…

MALICIOUS

PDF

77.4 KB Created: 2021-01-19 04:20:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: ac1e16d096f889c7a313df65b45d946a SHA-1: 1147a8d1a249ece36ebdb0ed90c01fc3d15e8b76 SHA-256: d526ff42b10c322a0c663c7105c9721cd0dcae241e84160d917ec5166e9e54d6
186 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as a phishing trojan and a machine learning model assigned a high probability of maliciousness. The heuristics indicate it functions as a link farm, containing numerous external links to other PDFs hosted on disposable domains and potentially malicious sites like maypoin.ru. The document body is heavily obfuscated, but the presence of external links suggests an attempt to redirect users to malicious content, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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://maypoin.ru/aws?utm_term=acido+nitroso+ecuacion+de+formacion PDF link annotation
    • https://cdn.sqhk.co/kapideto/f4EsChe/rexitalifo.pdfIn PDF document text
    • https://rimimasosonajis.weebly.com/uploads/1/3/2/6/132681992/zodubuwapovetebipev.pdfIn PDF document text
    • https://tadegelu.weebly.com/uploads/1/3/4/7/134734806/duligizupiladoguje.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463565/normal_5ff4da1ad32d1.pdfIn PDF document text
    • https://cdn.sqhk.co/kotoweraga/jgoJYKl/hidden_objects_mystery_tales_hangman_returns.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450516/normal_5faa3941d9725.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406482/normal_5fff127686704.pdfIn PDF document text
    • https://cdn.sqhk.co/jatizaru/dLsjcx1/pideji.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483346/normal_5fb370815db7a.pdfIn PDF document text
    • https://cdn.sqhk.co/wadelovelo/c0hfjdn/31826790134.pdfIn PDF document text
    • https://cdn.sqhk.co/wunokebewoz/nxdBggp/81787667823.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388283/normal_5f914c0fa2628.pdfIn PDF document text
    • https://lasajiboz.weebly.com/uploads/1/3/1/3/131379041/vutelomete.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421624/normal_60018f374f326.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/qjfQnFH/39406662703.pdfIn PDF document text
    • https://cdn.sqhk.co/gawukale/gdjcPie/defugiravoxokibe.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/0Ojeieo/72840877305.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/9069355.pdfIn PDF document text
    • https://budozawepolok.weebly.com/uploads/1/3/4/8/134852557/wenitusibaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ed53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED53 5124 bytes
SHA-256: 51949ff692cb01c81e60fb0ea4efc94c182a8302e7799aa1b6c5f4ea52aafba9
font_01_sfnt_off0000fead.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEAD 12132 bytes
SHA-256: ce728556f14b9d45a31d889f7b6fb37111c17bfdb5a6a8a63b4d11dcce908856

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