Malicious PDF — malware analysis report

Static analysis result for SHA-256 2be379994c157721…

MALICIOUS

PDF

83.4 KB Created: 2020-11-23 22:48:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 65328206d84f5fd3b35247471b1f9a9a SHA-1: 3ba181aaa435a14d68f3ea0693e56e199fb1d21d SHA-256: 2be379994c157721296fdc2c910b2740b7417445272f1c63342a2c1de1e28af7
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 pointing to what appears to be a link farm designed to host various PDF files. The primary malicious URL identified is trafffe.ru, which is likely used for phishing or distributing further malware. The ClamAV detection and ML classifier strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://trafffe.ru/strik?utm_term=kiko+narvaez+y+patricia+ruiz+se+sepa
    • https://davobudo.weebly.com/uploads/1/3/4/4/134432622/kuvoku.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://www.daltonmaag.com/
    • https://uploads.strikinglycdn.com/files/ca031b91-44ad-4c72-8fc3-7450ce5af91b/18415191719.pdf
    • https://uploads.strikinglycdn.com/files/089394bf-e7ee-4305-899e-ea8345c8ec61/dragon_age_arcane_warrior_build.pdf
    • https://uploads.strikinglycdn.com/files/a3c1d824-dd7f-4d14-bef4-ba2f76005b20/97092650959.pdf
    • https://uploads.strikinglycdn.com/files/385e98d5-d0f8-4792-9ffe-983b62697e85/7651396686.pdf
    • https://uploads.strikinglycdn.com/files/71feee22-1f89-4e5a-b5f6-6b68ca7c5df8/children_stories_in_telugu.pdf
    • https://s3.amazonaws.com/sugaguxagu/fefubu.pdf
    • https://s3.amazonaws.com/tugumeb/osrs_42_def_pure_guide.pdf
    • https://uploads.strikinglycdn.com/files/a21e18f1-14af-4dcf-b101-ec48e71ebca4/rolinezoritudita.pdf
    • https://uploads.strikinglycdn.com/files/b2ddc9fe-bc9c-4be3-9096-f245f24a3b16/free_download_point_break_2015_full.pdf
    • https://uploads.strikinglycdn.com/files/c359fd37-3c59-4b46-bea7-9e927423ef0e/tres_partes_de_la_teoria_celular.pdf
    • https://uploads.strikinglycdn.com/files/5648ee31-ab0c-4d24-a92e-fb96fef45a72/39039769789.pdf
    • https://uploads.strikinglycdn.com/files/18aa71f0-4df6-4fe9-a668-8bfa4fccdd70/relasetelekovesovogowogo.pdf
    • https://uploads.strikinglycdn.com/files/2d75a5a8-9aba-4522-9247-b5c90f4b7fb0/79903056242.pdf
    • https://uploads.strikinglycdn.com/files/0ac81d65-a6f4-4061-aa40-9ac07e3593ef/zenusudenigobam.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010eee.bin
3353eb0dc20e103fa0129890161065331ee36af1bd1b31fbfbad67be0b16a909		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10EEE 20868 bytes
font_00_sfnt_off0000d7d8.bin
2852a35e2fa6a7fb212d794c40283c0d3f9ab7a69450630deb789d82b850acac		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD7D8 5024 bytes
font_01_sfnt_off0000e909.bin
10dc03d2bb26df74cebbebdaabe245540798950806709e5ffbac82b6583e32be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE909 11064 bytes
font_03_sfnt_off00013231.bin
a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13231 4324 bytes

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