Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b014f4e1d932424…

MALICIOUS

PDF

75.0 KB Created: 2021-10-04 18:35:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 2d1c478e4611065a21426b77525bdff8 SHA-1: 182351a92eb9febce2715c834b74cb3c56b3d6d6 SHA-256: 6b014f4e1d932424d62fab37f6a7101a8d3f708d7a0291948ecb75d9a656d2d0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The ML classifier and ClamAV detection strongly indicate this PDF is malicious. The presence of numerous embedded URLs, many pointing to PDF files on various domains, suggests a phishing or credential harvesting attempt, or a distribution point for further malware. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that this PDF is part of a link farm designed to obscure malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://nhatngudongkinh.com/upload/ckupload/files/47304586490.pdf In PDF document text
    • http://arsvet.ru/img/upload/roxaruloluxa.pdfIn PDF document text
    • http://darec.sk/files/files/tedosetepegipenelidowokem.pdfIn PDF document text
    • https://myparrotfood.com/user_files/files/47160953506.pdfIn PDF document text
    • http://www.valaisconsulting.ch/file/demepazovijeluse.pdfIn PDF document text
    • http://hzbmsj.com/images/upload/File/49647177191.pdfIn PDF document text
    • https://hilanguage-com-tw.triangle-design.com/files/vavaxidujakitivabow.pdfIn PDF document text
    • http://www.magicapro.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613905ac993a7---remomivepur.pdfIn PDF document text
    • https://ubranni.com/uploader/files/jokajurijowax.pdfIn PDF document text
    • http://lse.hu/userfiles/file/86787598537.pdfIn PDF document text
    • https://mygoaltv.org/ipp/images/uploads/files/javaturidulibumodax.pdfIn PDF document text
    • https://auf.vn/wp-content/plugins/super-forms/uploads/php/files/fe7fhbsk0ic57d0tklltlc8gk2/18011497229.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/fizesofivajamodulopo.pdfIn PDF document text
    • https://98ing.com/upload/ck/files/20210909_164814.pdfIn PDF document text
    • http://invismortgagebroker.com/images/file/rizafogiripezisolavakuwe.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/fukuf.pdfIn PDF document text
    • http://herbwaterthailand.com/userfiles/files/72461279846.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=long+hair+with+layers+and+curtain+bangsPDF 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_off0000c143.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC143 11048 bytes
SHA-256: 8018f3c4cb6d54786349175195395566d9ef9d6f9f72353d347eb829d5f012e4
font_01_sfnt_off0000dac6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC6 17076 bytes
SHA-256: 981fc51aafe7e0d974dced5ac9d285035f5e6043676e3af310322f169bb4842f
font_02_sfnt_off000106d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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