Malicious PDF — malware analysis report

Static analysis result for SHA-256 98d5fa73b95e5fe5…

MALICIOUS

PDF

96.9 KB Created: 2021-01-25 08:05:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 2e60e34cc918ba448675e380cbbb6db8 SHA-1: 597e3fd27f35900f78535f5140acd176e0806170 SHA-256: 98d5fa73b95e5fe5427ea39ecfd5c787c316531c460790b6b18037fc2f781ca7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

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 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://trafffi.ru/aws?utm_term=chemistry+a+european+journal+supporting+information+template PDF link annotation
    • https://vesabigixovo.weebly.com/uploads/1/3/1/8/131857304/2c77a58a77d4d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472793/normal_600c5214b42c6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4457592/normal_5fd5f65e24357.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489850/normal_600211e53fb5e.pdfIn PDF document text
    • https://bateworolod.weebly.com/uploads/1/3/4/3/134315912/c19492e1.pdfIn PDF document text
    • http://yoga-fitness.space/joxuwumegqv.pdfIn PDF document text
    • http://shoes-storie.club/civil_war_photo_with_dinosaursw4it.pdfIn PDF document text
    • https://kotazuzufanimik.weebly.com/uploads/1/3/1/4/131438495/nipunugidudabimuj.pdfIn PDF document text
    • https://cdn.sqhk.co/ribobujir/aOmwjaB/nike_sky_force_3_4_red_and_blue.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471082/normal_5ff8dc0bbc3de.pdfIn PDF document text
    • https://fikenetefi.weebly.com/uploads/1/3/4/7/134771518/tiketevodozeba.pdfIn PDF document text
    • https://cdn.sqhk.co/rumomezojeku/a1jj00b/ionic_hammer_config.pdfIn PDF document text
    • https://cdn.sqhk.co/vujagefamig/IqXgjhh/lurutulidekulo.pdfIn PDF document text
    • http://immortal-sho.club/969937064684lsd3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gujemewemavud.rf.gd/toxurivigosi.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_off00013325.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13325 5400 bytes
SHA-256: bcc4caff5ffa2209b64b27c45c139d1088aa255d8b475746e0a4aaf9d649714f
font_01_sfnt_off00014562.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14562 14140 bytes
SHA-256: e9173672d0ef145f0fe4ca0e591bad68b3cad475ec093f32958b71ed91a1392e

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