Malicious PDF — malware analysis report

Static analysis result for SHA-256 3a88420e0c781be4…

MALICIOUS

PDF

80.7 KB Created: 2021-04-04 21:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4484ab56e69c4ab79c4f28ea5bfdebc6 SHA-1: eb6593cd2f870f561166a3437348b4f231c66f20 SHA-256: 3a88420e0c781be43caae84b5c043914b0551a8af88821969a9f23669b24ec2b
194 Risk Score

Malware Insights

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

The PDF document was flagged by multiple heuristics as a link farm and a potential phishing lure, with a high ML score and ClamAV detection confirming its malicious nature. The document body, though obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, and the presence of numerous external links indicates an attempt to redirect users to potentially malicious sites. The primary attack pattern involves using a fake invoice or payment lure to encourage clicks on these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://bologen.ru/award?keyword=adobe+scan+pdf+to+excel PDF link annotation
    • http://fugilugidijud.22web.org/68881318176.pdfIn PDF document text
    • http://tiluvopira.medianewsonline.com/the_thrilling_adventures_of_lovelace_and_babbage.pdfIn PDF document text
    • http://bewujasixi.mywebcommunity.org/cricket_bowling_tips_in_tamil.pdfIn PDF document text
    • http://piwakere.iblogger.org/logusapekuguluwuwax.pdfIn PDF document text
    • https://zorikibezoxima.weebly.com/uploads/1/3/1/3/131384208/8391198.pdfIn PDF document text
    • http://gokawojop.scienceontheweb.net/tekudat.pdfIn PDF document text
    • http://wapadax.scienceontheweb.net/62079517167.pdfIn PDF document text
    • https://jadegivi.weebly.com/uploads/1/3/4/8/134851053/popedet.pdfIn PDF document text
    • https://lilikegemuvil.weebly.com/uploads/1/3/1/3/131398424/dezipofewolod_wigitinedikodon.pdfIn PDF document text
    • https://kififapowugix.weebly.com/uploads/1/3/4/6/134685489/33ac8a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://17c3d818-7f64-4152-976a-2fa997d7a7be.filesusr.com/ugd/e2c250_79837384a9474d4abc2789985f2eaf89.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8b24fd2-b0c3-4937-9c5e-74a8f2ec64e4/57799547643.pdfIn PDF document text
    • https://e590c0d9-b694-44fb-9862-47327b30d8b0.filesusr.com/ugd/89363e_66e732aa05c047fa81d704f164304cd8.pdf?index=trueIn PDF document text
    • http://biwedidato.rf.gd/acls_algorithm_download.pdfIn PDF document text
    • http://kebanibaru.epizy.com/bekurezufumezivinowofulu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cde2acd6-7ada-4809-8305-10d045bbc124/mastering_the_rockefeller_habits_2.0.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685d60c1-7b3e-48a3-a422-d2be4677b722/8365307309.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/236e7cb1-c388-4d50-81db-206b69633ad4/15051281052.pdfIn PDF document text
    • http://jowokepo.atwebpages.com/wovamufejafaruv.pdfIn PDF document text
    • http://sujutesar.rf.gd/58414391892.pdfIn PDF document text
    • https://67389751-14cc-4ed3-b660-7ef7239e4cc3.filesusr.com/ugd/bb5584_cad4e3d936e44f15974de761483ee3c4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/1bae9d70-aafe-439a-a6a6-7dfb4e5d8c7d/lista_de_verbos_irregulares_en_ingls_traducidos.pdfIn PDF document text
    • https://4b3b4da4-1145-40fd-8a04-0ac29766dab0.filesusr.com/ugd/6c6203_ef238275b73a4e1abe6085e7ebb91092.pdf?index=trueIn PDF document text
    • https://8569cc17-8b2a-4187-ace0-95b0550b99f0.filesusr.com/ugd/d6eede_e11c002db3064abfa2b3bef075dfe67b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b3e61a6-89d6-4f3d-b894-d99227a6ff6a/are_salons_safe_covid_19.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_off0000f145.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF145 5248 bytes
SHA-256: cc9abbd47c21ebb5f1365f079d6e215b480a9250999f2dc2d6594a8e5ad15c5f
font_01_sfnt_off0001033a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1033A 15720 bytes
SHA-256: 9fec7458daacde7e3c851fe1cb0c8457a6f3062ee6e1c76b18425344ebe268fc