Malicious PDF — malware analysis report

Static analysis result for SHA-256 51cdb214e9f7d6e0…

MALICIOUS

PDF

83.7 KB Created: 2021-03-31 19:01:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c550a391e35335f2dfc19b9d06b66249 SHA-1: d849b4b0102bdd68d7bad2fe54faef474044e3f2 SHA-256: 51cdb214e9f7d6e06d141bcf83da9fd41e5f76ddf0d01cb3edd956d42a31c0ce
156 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, exhibiting characteristics of a phishing or malware distribution lure. It contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. The primary external URI points to a URL that appears to be part of this scheme, likely serving as a gateway to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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=neuron+structure+packet+answer+key
    • https://cdn-cms.f-static.net/uploads/4476140/normal_602e129669e10.pdf
    • https://xuleminemixek.weebly.com/uploads/1/3/5/3/135333740/guvunox-zizijewebaf-rotupinen.pdf
    • https://mojibivod.weebly.com/uploads/1/3/4/4/134490358/ecd495a93fe.pdf
    • https://botefajom.weebly.com/uploads/1/3/4/6/134690565/9492374.pdf
    • https://pisubamu.weebly.com/uploads/1/3/0/7/130740412/womavaxuwebuz-pozasokixadur-jodenobenup-selogus.pdf
    • http://reduslim-italiaoficial.site/739186329173yzrc.pdf
    • https://bododomeliba.weebly.com/uploads/1/3/1/4/131408614/zezama.pdf
    • http://lawyer-consult.ru/bugibibawogikekem3uux.pdf
    • http://mugurapit.sportsontheweb.net/manual_solidworks_2020.pdf
    • http://brandframeb.com/cet_key_answers_2019uuder.pdf
    • http://filuxunokenobud.mygamesonline.org/number_tracing_worksheets_1_100.pdf
    • https://tonukujile.weebly.com/uploads/1/3/1/8/131857071/zirevebu-fidofo-texojugaziz.pdf
    • https://narosixepitifon.weebly.com/uploads/1/3/5/9/135960882/lizuv.pdf
    • https://nelizebowi.weebly.com/uploads/1/3/4/7/134734992/tewokakimexatulet.pdf
    • https://cdn-cms.f-static.net/uploads/4464319/normal_5fd6a8c750ed6.pdf
    • https://gekirexuwiri.weebly.com/uploads/1/3/1/4/131452917/xigokuluromaf.pdf
    • http://relax35.ru/best_oil_for_husky_air_compressor1fq0g.pdf
    • http://electriccannoz.club/punexazanati2udt7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://ad060920-74d0-4a59-a46a-f478898ed72a.filesusr.com/ugd/a7c1e6_275b32793d3940adbbf6b218f229b235.pdf?index=true
    • https://5e1449e8-5ae4-4a15-bc7a-ee23795bc964.filesusr.com/ugd/3a34a5_e0a4916e7bf74ef1af80c77acf279c94.pdf?index=true
    • http://tepominofujemo.atwebpages.com/agneau_de_dieu_agneau_vainqueur_partition.pdf
    • https://835a0401-7144-467e-aacc-710587930ffc.filesusr.com/ugd/432cba_14bf167bfe6d457fa719a8d7513ca011.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fd0b.bin
13ea12e0f44bfa4a49312dfe34619e95ac85073edc873126a0db7b56b6a826f9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFD0B 4956 bytes
font_01_sfnt_off00010e13.bin
dd820efc00d7435a3535c263212af95b40260361aa70515ecd96aa7c86ac10bf		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10E13 10412 bytes
font_02_sfnt_off000131bb.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x131BB 4324 bytes

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