Malicious PDF — malware analysis report

Static analysis result for SHA-256 866b50311d0ae2fb…

MALICIOUS

PDF

81.6 KB Created: 2021-04-04 00:33:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: e0200b2d474fa3bdb3369b9eda2c3b79 SHA-1: f330c03e51e14894795af847bb3b95396861e5d0 SHA-256: 866b50311d0ae2fbf911dc44b7bba903c16cbc03e479b917bdb301c2284b15f0
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_LINK_FARM' suggests the document is part of a network designed to manipulate search engine results by linking to numerous external PDFs. The embedded URLs, such as 'https://zajinet.ru/award?keyword=hernia+de+hiato+sintomas+pdf', are likely used to redirect users to malicious or spam content, aligning with a phishing or SEO manipulation attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://zajinet.ru/award?keyword=hernia+de+hiato+sintomas+pdf PDF link annotation
    • http://talajudoxuxip.mygamesonline.org/problem_solving_method_of_teaching_mathematics.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375355/normal_6006e1ee8d379.pdfIn PDF document text
    • https://xevivipemasap.weebly.com/uploads/1/3/4/4/134481894/fasakugorurivi_watixitog_doxowadukarorax_fonex.pdfIn PDF document text
    • https://zuwizogagotajal.weebly.com/uploads/1/3/4/0/134012426/ziwupuvomujatopaza.pdfIn PDF document text
    • http://sadogiropi.mypressonline.com/diphtheria_toxin_mechanism_of_action.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501374/normal_6053a1fee75cf.pdfIn PDF document text
    • https://cdn.sqhk.co/gonolesuzam/X262ic4/24345662201.pdfIn PDF document text
    • https://cdn.sqhk.co/kivipemo/Coljfza/20686375296.pdfIn PDF document text
    • https://cdn.sqhk.co/tofegejij/mLlThhO/niwux.pdfIn PDF document text
    • https://cdn.sqhk.co/zekafomaze/mCPqjel/18777315178.pdfIn PDF document text
    • http://bumefivaloso.scienceontheweb.net/bioremediation_research_articles.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://951e66c5-660f-4748-bfcc-a6cc0831133d.filesusr.com/ugd/4967bb_c58ee0cf59e145fca954f90b9f0fa948.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jubiferekaka/ann_arbor_observer_city_guide.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_5ce6607f11f64625a88e146689f85e8f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rabewiruzitewa/bujiwebimexo.pdfIn PDF document text
    • https://s3.amazonaws.com/xukanomarexumu/66063740542.pdfIn PDF document text
    • https://9eb5ee95-128e-4115-bcd6-d8db8525ce49.filesusr.com/ugd/9904c2_70978263f3694f40be5c252075cd9f4f.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_31cba20a63c14d4babb78a5e85097394.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/nigimul/kidaropadajunemovo.pdfIn PDF document text
    • https://234d5d8d-19c9-4cab-a884-dd0775662658.filesusr.com/ugd/fb7225_d36c0a080a7b4afc9d69fbcb975e0ab7.pdf?index=trueIn 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
    • https://medlineplus.gov/sIn 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_off0000fec4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFEC4 5212 bytes
SHA-256: 3d086f1fdfd8cfcbf118532e0e214cc097caa9978139750808b93de0f4d70a29
font_01_sfnt_off0001104d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1104D 12128 bytes
SHA-256: b2004395f7357eb547cf6ccfbd800f70b6473d32d3d497d1d2112124d94efa19

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