Malicious PDF — malware analysis report

Static analysis result for SHA-256 172f05acd13a85a2…

MALICIOUS

PDF

79.4 KB Created: 2021-04-07 16:14:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0266c4800521ff5a2213e1ba78a3378f SHA-1: 419ba5d151a6dce0535f5a371a114eceb5df7281 SHA-256: 172f05acd13a85a2125d6fcfa41007510099b917f9333c37fcad0f8f108e489c
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting it is part of a link farm designed to drive traffic to other sites. The ClamAV detection and ML classifier also strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and numerous URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://pelibifir.ru/wix?keyword=queen+weave+beauty+amazon
    • http://help-verifiedbadgecenter.com/warriors_dont_cry_summary_chapter_16p8czn.pdf
    • https://danudaxeki.weebly.com/uploads/1/3/5/2/135297903/3116438.pdf
    • https://cdn-cms.f-static.net/uploads/4485702/normal_60350da22821d.pdf
    • https://xapowukugo.weebly.com/uploads/1/3/4/7/134702937/xedafezenuwumirelepe.pdf
    • https://static.s123-cdn-static.com/uploads/4367644/normal_5fe08abdc2fb7.pdf
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5feccf382b95a.pdf
    • https://fupelesanu.weebly.com/uploads/1/3/1/6/131606305/jonuxikuruwesupov.pdf
    • https://jenitexul.weebly.com/uploads/1/3/4/8/134859983/xuxigadod_fobojatomum.pdf
    • http://smartradiobf.ru/systems_engineering_jobs_denverp55r9.pdf
    • http://samettemiz.xyz/maytag_bravos_quiet_series_300_washer_not_drainingamdd7.pdf
    • http://thrivewebs.com/how_to_fix_bosch_washing_machine_not_spinninguxszi.pdf
    • https://mojebope.weebly.com/uploads/1/3/4/6/134609081/b638bd45ba15d79.pdf
    • https://cdn-cms.f-static.net/uploads/4379053/normal_605adf4289e7e.pdf
    • http://winoraama.fun/15408311881mzvwe.pdf
    • http://instapodarok.site/2732258425vxeb6.pdf
    • https://tugojomabam.weebly.com/uploads/1/3/4/5/134588125/6683496.pdf
    • http://shop-profildoors.ru/314666156454z8iv.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://numifugok.rf.gd/video_player_android_library.pdf
    • http://fubimilimavun.epizy.com/80086384496.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f943.bin
078a064990245957aebb22e2bc6bc89c840b29e17e371db31d452772e7b7cf97		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF943 5028 bytes
font_01_sfnt_off00010a77.bin
9b5fe3e0321ef4db8088df2c9f3b38cf6c828b676b9bc44df21e6457625ba4d0		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10A77 11200 bytes

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