Malicious PDF — malware analysis report

Static analysis result for SHA-256 33e43f8cf2dca311…

MALICIOUS

PDF

85.3 KB Created: 2021-01-08 19:57:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc52c44bf745df97fce3992377c839e4 SHA-1: dcad29b6682cc0b4d2c467b42493765c408797e4 SHA-256: 33e43f8cf2dca311eb903b5e687c577eed3761d6ed3675d07acd7e6ab62233b4
156 Risk Score

Malware Insights

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

The sample is a PDF file flagged by ClamAV and an ML classifier as malicious. It contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary external links, 'https://trafftec.ru/123?utm_term=c%252B%252B+math.h+pow', is suspicious, while another link points to a PDF hosted on AWS. The document body is heavily obfuscated and unreadable, suggesting an attempt to hide its true content or functionality.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafftec.ru/123?utm_term=c%252B%252B+math.h+pow
    • https://cdn.sqhk.co/bazopaxepifu/VREiije/rorukoxi.pdf
    • https://ratopavitakam.weebly.com/uploads/1/3/4/4/134460251/diledikod.pdf
    • https://cdn.sqhk.co/zetanitanedo/qihvibd/star_trek_premium_pinball_mods.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fakuguvil/fevawawuniloxixataravewet.pdf
    • https://uploads.strikinglycdn.com/files/81444c97-e733-47e8-a7a4-45da5b447529/83299466096.pdf
    • https://uploads.strikinglycdn.com/files/e2bb4c48-9e46-464a-aef7-3b6cdbc82034/netuzakanifudijoneluz.pdf
    • https://uploads.strikinglycdn.com/files/be00e7d5-4dd3-455f-8508-873e0669217c/how_to_prescribe_insulin_dosage.pdf
    • https://uploads.strikinglycdn.com/files/a4074e3b-afbe-41d1-b3b0-1d190db6142f/carpet_rc_car_tracks_near_me.pdf
    • https://uploads.strikinglycdn.com/files/1071554a-e144-4468-b846-3829042ecb2f/31913704249.pdf
    • https://s3.amazonaws.com/xojafemori/80001336517.pdf
    • https://s3.amazonaws.com/mozirolinitaje/rupusizijivoguvapifarug.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
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cc38.bin
ee967d0753b2d2a4adac8653f626fc35aa0f6825758fca4093f1b33b6e1af134		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCC38 12316 bytes
font_01_sfnt_off0000f397.bin
debf058372f33374e76d91dbb56f8fecfd23fde37203e59ec47be985412db434		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF397 4780 bytes
font_02_sfnt_off000103c5.bin
2d08be51284d9de5c5b28e69c28089aab3519a2b5674886b00af3f1af31a9575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103C5 14416 bytes
font_03_sfnt_off000132fe.bin
06d84a79787f49517cba9647d12dd77c675544b9e46e70dbd0c3ec2b8d2a160e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132FE 16132 bytes

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