Malicious PDF — malware analysis report

Static analysis result for SHA-256 3e8462ef4a076744…

MALICIOUS

PDF

87.1 KB Created: 2021-03-30 14:49:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d7f1170159fbbb4908e35454681d58a6 SHA-1: 1a382a10e8deca2a5eac9f3b4524be83ea13701b SHA-256: 3e8462ef4a076744d49aee39d0c38ef0b311eece77bbd95502deb8bb86bab44b
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, flagged as a link farm, and is identified as malicious by ML classifiers and ClamAV. The presence of embedded URLs and the heuristic 'PDF_SEO_LINK_FARM' indicate an attempt to redirect users to potentially malicious sites. While no scripts were explicitly extracted, the nature of the PDF and its numerous external links suggest it is designed to lead users to phishing or malware hosting sites.

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://xezojetit.ru/123?utm_term=linfoma+de+burkitt+en+ni%25C3%25B1os+pdf
    • http://dafesoxexigu.medianewsonline.com/63276817159.pdf
    • https://jewesorovusupim.weebly.com/uploads/1/3/6/0/136092124/3216727.pdf
    • https://vaxejoxumede.weebly.com/uploads/1/3/5/3/135346770/wilufutamej.pdf
    • https://nukawopuriw.weebly.com/uploads/1/3/4/3/134347541/af26e688049d.pdf
    • https://giweberemep.weebly.com/uploads/1/3/2/6/132682555/xegogexazo.pdf
    • https://static.s123-cdn-static.com/uploads/4482671/normal_6001c8b2db243.pdf
    • https://cdn-cms.f-static.net/uploads/4416935/normal_6054ee100f81b.pdf
    • https://cdn-cms.f-static.net/uploads/4483337/normal_600fb4a9b9db9.pdf
    • https://cdn-cms.f-static.net/uploads/4451028/normal_601a53b3a1c31.pdf
    • https://falaxejuwutop.weebly.com/uploads/1/3/2/6/132681153/pubafugisim.pdf
    • http://renijulemigato.iblogger.org/19453296300.pdf
    • https://raxitiladiruwek.weebly.com/uploads/1/3/4/4/134487911/nevipipujezipapus.pdf
    • https://cdn-cms.f-static.net/uploads/4471513/normal_60512c7b3ec53.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://powazov.rf.gd/setumusimozisixidute.pdf
    • http://jokajejuti.atwebpages.com/redes_troficas_ecosistemas_acuaticos.pdf
    • https://s3.amazonaws.com/ruzumeb/how_to_influence_and_win_friends_summary.pdf
    • https://s3.amazonaws.com/wopari/enchanting_minecraft_guide.pdf
    • https://s3.amazonaws.com/fonibinaraj/vpn_unlimited_lifetime_free_for_android.pdf
    • http://mepitar.atwebpages.com/velalisiniju.pdf
    • http://jalasofumikom.rf.gd/zumipajoxetojekafiputol.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_off000113b4.bin
03efc858c42680741f31460c8162515d2f08af3c96341e387225414d2ae07df7		 pdf-font-stream PDF embedded font (sfnt) at offset 0x113B4 5512 bytes
font_01_sfnt_off0001261a.bin
ef7291bcc4a4949e001b126c29aed062550e6b0b33dc4d55b4db33fbe92a7728		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1261A 12176 bytes

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