Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b45c8eb9dec615c…

MALICIOUS

PDF

74.2 KB Created: 2021-03-30 09:43:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 526e457ac02f69ae65bcf5346b9270fd SHA-1: 2c43b0f1740548339715bfa2104e3b5763fb6677 SHA-256: 9b45c8eb9dec615c8cc8187533d303545bf82df7ea340230d4e6e31bcdb9da08
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which are hosted on disposable domains or file-sharing services, indicating a link farm or phishing attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely to redirect users to malicious sites for credential harvesting or further malware delivery. Although no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://nipisod.ru/strik?utm_term=lonely+planet+sweden+book
    • https://kukitame.weebly.com/uploads/1/3/1/3/131379641/tenagawiw.pdf
    • http://physcoo.com/78805677418nna6o.pdf
    • https://bugupomulu.weebly.com/uploads/1/3/5/3/135396692/jotilokuzuraxon.pdf
    • https://cdn.sqhk.co/sedazozesufu/fgvhjhh/karenalizifomaxo.pdf
    • http://microbestdigitalmeter.xyz/frigidaire_ffad7033r1_70_pint_white_dehumidifier_canada2hg4r.pdf
    • https://katesagi.weebly.com/uploads/1/3/4/8/134864962/1854290.pdf
    • https://cdn.sqhk.co/pajubopolak/5OhiKhh/kitten_runt_behavior.pdf
    • https://cdn.sqhk.co/kuzetuzame/aGjewjc/looper_movie_age_rating.pdf
    • http://agreevudb.rest/pafifewevojuwusunejivyeeq.pdf
    • http://laithub.pro/97147433953vumdz.pdf
    • https://xovatikawe.weebly.com/uploads/1/3/4/7/134726086/zowebades.pdf
    • https://cdn.sqhk.co/guzoladip/fUlhcid/wasesobigetegerifibitefiv.pdf
    • https://cdn.sqhk.co/mepapogivoma/jejciha/odd_eyes_revolution_dragon_legacy_of_the_duelist.pdf
    • https://goneduxif.weebly.com/uploads/1/3/0/9/130969586/1978130.pdf
    • https://cdn.sqhk.co/lirebirab/mha3jdA/54441270404.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://pefodajisotavuk.rf.gd/astro_free_website_templates.pdf
    • http://nufufud.epizy.com/android_notification_sound_not_playing.pdf
    • https://3fb740b9-71d8-4183-8edb-de11b68c0a29.filesusr.com/ugd/1fbf8b_e9e4d7b7cbf2462fb602d5ca926ced0c.pdf?index=true
    • http://rupexobepuwum.epizy.com/voziv.pdf
    • https://c2dbac7f-2075-4dc1-ad03-af0d0352bff2.filesusr.com/ugd/278743_697d3abe595544d497c82eee50bdfd1f.pdf?index=true
    • https://b1b0174c-961c-4936-87f6-765e1132391e.filesusr.com/ugd/6cf804_94df6c32edbe43eda3ecef5f05781944.pdf?index=true
    • https://4dd4a32c-aced-41d2-87e6-7ff9ca8080d7.filesusr.com/ugd/6d6f33_01767ad6c16f4ae18865ad1d3bf127f8.pdf?index=true
    • https://b66a6cc6-7028-4fd7-9d19-084b2b27c535.filesusr.com/ugd/4015cf_7e92ca03c94045de91b212b1d913f7af.pdf?index=true
    • 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_off0000dfe2.bin
a71ce87b3e5807b2fd8c4b3b4b6be56a9191947bb94d7d52a0e865d09c41b686		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE2 5196 bytes
font_01_sfnt_off0000f1b8.bin
0b7f39b2c03390d076cec5781403376251a1ef9c961cd805fd9587408d1b9a47		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1B8 12920 bytes

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