Malicious PDF — malware analysis report

Static analysis result for SHA-256 52901bd0f1d20d79…

MALICIOUS

PDF

81.9 KB Created: 2021-04-22 01:26:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 6284f73f97e76278ed07ebd8081c40e4 SHA-1: dc6d1df0e66ff8856c1b6dc3c3f91946dadd25d8 SHA-256: 52901bd0f1d20d79fc76170103457e423c790d22e6197b114e0a6645c469c591
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://golowaki.ru/strik?utm_term=best+beginner+piano+book+for+adults+reddit PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383687/normal_6004b05167374.pdfIn PDF document text
    • http://rexavomevezuro.iblogger.org/volcano_diagram_worksheet.pdfIn PDF document text
    • https://zipegudedore.weebly.com/uploads/1/3/1/6/131636753/4fefccc3e.pdfIn PDF document text
    • https://vavuwujaxozu.weebly.com/uploads/1/3/1/0/131070334/4675173.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487192/normal_6056ab9bdab3b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425912/normal_5fd8c0beb65b7.pdfIn PDF document text
    • https://lofemeraj.weebly.com/uploads/1/3/2/8/132814933/1640182.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494166/normal_603671ce996f3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d8f9a80-19df-414d-bce8-26d1c9a4f51c/gegexonevorabari.pdfIn PDF document text
    • http://lemimokodifuve.epizy.com/fodikevuwujilu.pdfIn PDF document text
    • https://s3.amazonaws.com/faduxodiwo/53418468539.pdfIn PDF document text
    • https://s3.amazonaws.com/fidobakipivogit/potakifidu.pdfIn PDF document text
    • https://s3.amazonaws.com/kikunojulejuj/71832184993.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/gegumewadewopexido.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0f3571c5-bf7c-46a0-99ab-a8af57eb8197/taval.pdfIn PDF document text
    • https://s3.amazonaws.com/dazifozixawus/nigeria_hip_hop_instrumental_beat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/daca2553-c8b7-4f25-af5b-209390fbe23e/nafamirawigozilagariniwu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a0e0d34-06ab-4634-9c4e-efa7a9662a68/wofekivutoferapuvol.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/pabidizunazitedaxoxevok.pdfIn PDF document text
    • http://namulamix.rf.gd/counter_strike_source_zombie_riot_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/jotogorurekuro/63330614486.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010424.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10424 5464 bytes
SHA-256: f3dfbfd81956fea074482264f245225826ce46bf30c3482b24bfc5fa0b5a75b0
font_01_sfnt_off000116cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116CB 10484 bytes
SHA-256: dbd6b68bba5d34fa27964e6dc38567cd04c0ae671a72760ddf9add49bab4b152

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