Malicious PDF — malware analysis report

Static analysis result for SHA-256 4402fdac16ecf03e…

MALICIOUS

PDF

76.6 KB Created: 2021-03-14 13:06:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b34d9b9dcccd9b4ab45176d1d4345c6d SHA-1: 44a594622b9aed856a95bf2156cdf89553b09183 SHA-256: 4402fdac16ecf03e24be2985893aab703926e704e706371f76959e613bb3b5f4
156 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by multiple heuristics, including ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The presence of numerous external links, including a link farm, suggests the document is designed to redirect users to potentially harmful websites. The ClamAV detection name 'Pdf.Phishing.Trojan' further supports a phishing or trojan delivery vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://midufefew.ru/wix?keyword=the+wife+of+bath+questions+and+answers
    • https://cdn.sqhk.co/rubogomuweme/ii9hIjb/shelter_in_place_california_alameda_county.pdf
    • http://bas-vorota.ru/19351109810tvk3d.pdf
    • http://velesvoyage.ru/crazy_zombie_v_9._0_y8bquk0.pdf
    • http://lopixerirerenex.mywebcommunity.org/arduino_tutorials.pdf
    • http://getcreditcheck.info/toro_20332_lawn_mower44m31.pdf
    • http://vasakuso.sportsontheweb.net/xisoxurutalilis.pdf
    • http://rezumitisud.mygamesonline.org/zaxanomotusajesabotuj.pdf
    • https://cdn.sqhk.co/dediwifime/RhjghOS/49382584703.pdf
    • https://cdn.sqhk.co/loganidob/23gehd5/bomber_crew_game_pass.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://63b1f34b-4847-450f-8d9a-4788d10e1cf5.filesusr.com/ugd/451a43_3bd6a6cced6d4664b7779d79b9c39049.pdf?index=true
    • https://s3.amazonaws.com/zesixefe/guredezolerelufijuzofopej.pdf
    • https://2e5cbe44-7de3-4e3f-b94c-8a8567814465.filesusr.com/ugd/f96b02_baaca4fe528b452684e86d015756f5fb.pdf?index=true
    • https://700ceb37-22d2-47c5-9888-d858af679aee.filesusr.com/ugd/c345b0_c7f75a76eab4498cb43584eac34f6d26.pdf?index=true
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_c7ffc32eeaf74f21ac543ab4d1f1c961.pdf?index=true
    • https://11210a16-d5d1-4e17-93a3-27fbbb12f21b.filesusr.com/ugd/fb658e_5ceabe72f4f44e80a47513870d507083.pdf?index=true
    • https://e0eedba4-cf99-4c42-97f5-d3f9ae5832dd.filesusr.com/ugd/e36ea7_b1d861a17cd34e479acf455704132fac.pdf?index=true
    • http://liraperuwuw.atwebpages.com/39054536523.pdf
    • https://s3.amazonaws.com/wujodibu/java_emulator_for_android_free.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_off0000ecfe.bin
1fb729abb29c684cd7b2d15bc4962e24461d4cb3ae5f841d731e2a67778d1ade		 pdf-font-stream PDF embedded font (sfnt) at offset 0xECFE 5268 bytes
font_01_sfnt_off0000fef4.bin
035f1e92a2b8acc309abbdf480039e27180f3474dc2fcb14c65bf8c1bac68925		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFEF4 10808 bytes

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