Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4ea4c8af4d21f97…

MALICIOUS

PDF

87.9 KB Created: 2021-03-21 06:25:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: e89c7774dd647ccfee3297f2ceda2e9e SHA-1: 6266ac0d1508a40f720319a8cb08b619c654f6aa SHA-256: b4ea4c8af4d21f975f7bfc74c06b72bfa5beda40e35f8f8210e3819fa9b504f5
126 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. It contains numerous external URIs, including one pointing to 'zajinet.ru', suggesting it functions as a link farm or redirection mechanism to phishing or malware sites. The presence of embedded URLs and the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further support this, indicating the document's primary purpose is to drive traffic to potentially harmful external resources.

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 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://zajinet.ru/wix?keyword=second+life+beginners+guide+2019 PDF link annotation
    • http://wgathering.org/31476312233v0pty.pdfIn PDF document text
    • http://apparentlyopt.com/what_is_inductive_analysis_in_qualitative_researcho0y0p.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450724/normal_6027a523af107.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4528915/normal_604c98824bb96.pdfIn PDF document text
    • http://lesagotefawa.22web.org/acer_aspire_e5-_575_drivers.pdfIn PDF document text
    • http://oneshops.space/rakefikikikokac7qo1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484804/normal_60466b55c4db0.pdfIn PDF document text
    • http://parkji5x.xyz/padololiluvitanalaje1qdp4.pdfIn PDF document text
    • http://rawenspant.online/helo_status_app_tamilqyj69.pdfIn PDF document text
    • http://hookup153.site/hcc_guidelines_easl_2018zznjj.pdfIn PDF document text
    • http://lg-supportteam.com/77962940232h98vs.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://ba10d46a-d7c1-43af-8542-f1a50f31aa8a.filesusr.com/ugd/4dded2_1e986053a9c842cea5fd4fa9340e6732.pdf?index=trueIn PDF document text
    • https://dab7fb03-f2af-4a8e-9cb9-31de623bedb3.filesusr.com/ugd/58b596_c0cb43589a8947fa84ac760a3dac9335.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/bizamesuwepe/87532995971.pdfIn PDF document text
    • https://aca56392-15ae-48e8-982c-fdf6c4ac0dc3.filesusr.com/ugd/00c070_cca0ebe907b64b35915a5533b3550166.pdf?index=trueIn PDF document text
    • http://viwajetomuzopo.epizy.com/45643481965.pdfIn PDF document text
    • https://s3.amazonaws.com/bipovoromoj/konagiderev.pdfIn PDF document text
    • https://3f735f5a-cd1c-4288-bd93-adeff6e084d9.filesusr.com/ugd/bcc0e4_dbad4dc92f6e4ac8ad2dc1d6f06cf032.pdf?index=trueIn PDF document text
    • http://vipiwimepi.epizy.com/wesijejabib.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000119e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119E4 5704 bytes
SHA-256: 50b4ce6c33e1944886fdee6859043638883c05577a499e34fe8cea755b492498
font_01_sfnt_off00012d60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D60 10988 bytes
SHA-256: 3f38422928bdb62e490ab2358d8fd21c948d3451643efc350838a00dc93aae20

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