Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd7b42794382b6f4…

MALICIOUS

PDF

69.4 KB Created: 2021-04-08 06:22:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 5c708f7a5022be72c344a23fe3e60cdc SHA-1: 704a327ff85857628e5dd63d1f80b0233a8d70e9 SHA-256: bd7b42794382b6f4cfe8ab2acb07f29561882e348d1335fc499383f562d7ffa3
186 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 6

  • 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.
  • 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/wix?keyword=black+clover+fanart PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4371004/normal_60460dd1d2d19.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487186/normal_6023bf207b8d6.pdfIn PDF document text
    • https://cdn.sqhk.co/wimedizi/ifThghi/pokemon_go_wallpaper_for_ipad.pdfIn PDF document text
    • http://stassikorskyi.com/38920948973p7i08.pdfIn PDF document text
    • https://cdn.sqhk.co/minamojazi/hghijWV/invaluable_experience_definition.pdfIn PDF document text
    • http://granitmetrospecstroy.ru/manual_mill_cnc_conversion_kit4l8xg.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/ibhbicd/anime_face_changer_for_pc.pdfIn PDF document text
    • https://lekomitigukajar.weebly.com/uploads/1/3/5/3/135345412/7113636.pdfIn PDF document text
    • https://zawasofolebu.weebly.com/uploads/1/3/4/9/134902788/3845448.pdfIn PDF document text
    • http://mgacessoria.online/best_orhan_pamuk_book8adc1.pdfIn PDF document text
    • https://jajaleregonu.weebly.com/uploads/1/3/4/2/134235513/xudiparojopok.pdfIn PDF document text
    • https://cdn.sqhk.co/xamapetarel/jvhbGGO/vortex_bladeless_wind_turbine.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410002/normal_603714e04405b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_605ca34859a65.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449421/normal_6002d3adab8e9.pdfIn PDF document text
    • https://cdn.sqhk.co/fugovigul/ie329cy/46469111566.pdfIn PDF document text
    • http://ukranews.icu/bitigadebefokibekijogigoetgd.pdfIn PDF document text
    • http://stepka2016.xyz/tgirls_new_york1odwq.pdfIn PDF document text
    • https://cdn.sqhk.co/solijisivono/P7Oic6K/96405284803.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/1552b59c-86ac-4c04-a64c-8bf5bcbb6346/olympus_om-1_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e30b8ca-3240-4908-b6ac-d1c29edd5b11/how_to_properly_clean_honeywell_humidifier.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f1a07e90-8dcd-4b9e-bec7-1a3261910a3e/76260823168.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_off0000d268.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD268 4868 bytes
SHA-256: 49bd1f47ddcb17c41b68186cb924d9ba82f7d7468a2b273ae42d9ce1058a9d95
font_01_sfnt_off0000e313.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE313 10756 bytes
SHA-256: 81af4eb91351e7131f7531271794b93e831c5c66b52fd8446fe558c526ca372c

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