Malicious PDF — malware analysis report

Static analysis result for SHA-256 a67096c78f4a8b9d…

MALICIOUS

PDF

81.6 KB Created: 2021-09-18 12:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: cf3c728a6cd260cc9098bb9167edf385 SHA-1: 38600ea26a641aa9e9e8e2c40f98b2915637ea29 SHA-256: a67096c78f4a8b9d05ffa800cdbf1b184c6e1cbe31a0f3f6b75d2a122186646c
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The presence of a 'Security software disable instruction' heuristic strongly suggests an attempt to bypass defenses. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a phishing or malware distribution lure, likely involving a JavaScript exploit to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Security software disable instruction high SE_SECURITY_BYPASS
    Document instructs the user to disable antivirus or security software — unusual for ordinary documents and high-risk in an unsolicited file
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dom-titan.rs/files/89317624029.pdf In PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210902111038.pdfIn PDF document text
    • http://gkz-crimea.ru/userfiles/file/vipamoxevesuti.pdfIn PDF document text
    • http://qiuyutv.com/userfiles/files/20210908115225.pdfIn PDF document text
    • http://villaturri.it/wp-content/plugins/formcraft/file-upload/server/content/files/16132b6815cc04---fubidaruvesizekigiremedon.pdfIn PDF document text
    • https://dimensionshoppe.com/alpha/ckfinder/userfiles/files/32427970014.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/jifovulagaron.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/jolemonateburulisolef.pdfIn PDF document text
    • http://actybrain-consult.com/Upload/files/zimexotarojoridur.pdfIn PDF document text
    • http://rubensova16.cz/files/file/89053517163.pdfIn PDF document text
    • https://hotelritariccione.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613fdcb1dc09d---92208257605.pdfIn PDF document text
    • https://bibliothequedesarts.ch/ckfinder/userfiles/files/5149046365.pdfIn PDF document text
    • http://nhadep30giay.com/uploads/image/files/xilabazet.pdfIn PDF document text
    • http://thaoduoconline.com/userfiles/image/file/97765223537.pdfIn PDF document text
    • http://bluebiz.kr/userData/board/file/14325673935.pdfIn PDF document text
    • http://xn----7sbakn3aoflleitf3m6a.xn--p1ai/userfiles/file/koguzapaziwumevidokifo.pdfIn PDF document text
    • http://chinalabware.net/d/files/38277799958.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/6naE_Nh8_CY/uplcv?utm_term=call+of+duty+modern+warfare+3+torrent+downloadPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d811.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD811 18484 bytes
SHA-256: a23c784d76acd13bd99dadc6e1064e0880b1492e4be6d97e2f240fb530231468
font_01_sfnt_off0001082d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1082D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012044.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12044 10756 bytes
SHA-256: 2a096fc2fb832d94cb17b285dc90d51ee6e275bc02c26f2f7647e82268e27733

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