Malicious PDF — malware analysis report

Static analysis result for SHA-256 3fc8a91be8c2d6ef…

MALICIOUS

PDF

74.5 KB Created: 2021-06-11 05:01:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: e2577430c0ab7992994949a97ff6a218 SHA-1: 5e39f3da4f93243f34f0045b88f52a6f1625a97b SHA-256: 3fc8a91be8c2d6ef78942714b6b184aa7f39087aac85016b48c5cf3534330696
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 0.9996

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://nomylo.ru/pbw?utm_term=fade+kanye+west+mp3+free+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4472200/normal_5fe2bcbce8753.pdfIn PDF document text
    • https://lunidopufakim.weebly.com/uploads/1/3/4/4/134482460/4ab3f3ee1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391327/normal_60bec9205b9ea.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4528915/normal_6000a1505d36b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444626/normal_5ff0063e41079.pdfIn PDF document text
    • https://daxugukixirujin.weebly.com/uploads/1/3/4/7/134739014/wotagubim_megexidifurop.pdfIn PDF document text
    • https://vatunumorese.weebly.com/uploads/1/3/4/8/134866462/jomilubo_nojelokijidotej_dinazogoxale.pdfIn PDF document text
    • https://dozexida.weebly.com/uploads/1/3/4/5/134590021/1540476.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480878/normal_6054ea7b23490.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4497358/normal_5fcb0b24c31f7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376619/normal_5fdd9c60f377c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369142/normal_5fd6c29170626.pdfIn PDF document text
    • https://zuripiri.weebly.com/uploads/1/3/1/8/131856797/1ff73b7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496001/normal_601c7aaf1293f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fenetikuro.pbworks.com/w/file/fetch/145031451/totadibop.pdfIn PDF document text
    • http://nozobitativi.pbworks.com/f/spin_the_wheel_for_robux_no_human_verification.pdfIn PDF document text
    • http://lorugaz.pbworks.com/w/file/fetch/144878847/11508609389.pdfIn PDF document text
    • http://sovafiben.pbworks.com/w/file/fetch/144563037/35647079358.pdfIn PDF document text
    • http://tinigogazos.pbworks.com/f/validity_of_open_work_permit_canada.pdfIn PDF document text
    • http://katafuzum.pbworks.com/w/file/fetch/144483933/how_to_uninstall_asi_loader_gta_5.pdfIn PDF document text
    • http://pebolokunaz.pbworks.com/f/60435976508.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_off0000e19c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE19C 5564 bytes
SHA-256: 512fac0ec69baae461f510783e4420dd0afa724595ecfdf84ac6515f058b559b
font_01_sfnt_off0000f498.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF498 12412 bytes
SHA-256: afb8143ffc0a2f8ac0bd8a0b37483b3ed7e63d50dbd1949290cfa323fde9636e

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