Malicious PDF — malware analysis report

Static analysis result for SHA-256 2931e3c5b048940e…

MALICIOUS

PDF

72.1 KB Created: 2021-10-06 01:54:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 13583f9af50edf64fadc32af9d3fab09 SHA-1: b32b712ebdc1f1282ae95c387947b0af16cf9d99 SHA-256: 2931e3c5b048940ee55c5d6c7ba9938af25260f261f46f94947c101754d9c65d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically flagged as a phishing trojan. The PDF contains numerous embedded URLs, many of which point to domains that appear to be part of a link farm, suggesting an attempt to redirect users to malicious content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a non-clustered link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://ketchas.ru/uplcv?utm_term=being+ethical+definition PDF link annotation
    • http://paroissedementon.fr/upload/files/28905841940.pdfIn PDF document text
    • http://elite-nails.pl/Upload/file/1860122395.pdfIn PDF document text
    • https://jss-moms.si/upload/File/51110579719.pdfIn PDF document text
    • https://x-software.cz/data/file/65346937408.pdfIn PDF document text
    • https://tannhatviet.vn/upload/files/30377343208.pdfIn PDF document text
    • http://alhegazgroup.com/userfiles/file/98293472177.pdfIn PDF document text
    • http://nusratali.com/userfiles/files/sotetawete.pdfIn PDF document text
    • http://isdoor.ru/uploads/files/zogolojewiwojevagowonaxuk.pdfIn PDF document text
    • https://clifestyle.net/uploades/userfiles/file/87586027828.pdfIn PDF document text
    • https://holocaustresearch.pl/nowy/photo/file/xavonoloj.pdfIn PDF document text
    • http://urbariatprasice.sk/upload/file/jojanurijitukodi.pdfIn PDF document text
    • http://atmaircenter.com/lb/userfiles/files/waxegu.pdfIn PDF document text
    • http://tatugigo.com/ckfinder/userfiles/files/5076873063.pdfIn PDF document text
    • http://floridadressyourhome.com/uploaded_files/userfiles/files/63916119665.pdfIn PDF document text
    • http://lustigersteirer.at/userfiles/file/46461208452.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/52872067624.pdfIn PDF document text
    • http://7seapharmtech.com/Uploadfiles/files/34118111518.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/pipibapujinosakowegoze.pdfIn PDF document text
    • http://czernavendeghaz.hu/admin1/file/rugoxekumapaxupesivis.pdfIn PDF document text
    • https://textosolutionslinguistiques.ca/upload/editor/file/mavumov.pdfIn PDF document text
    • https://marthomaktrplrdiocese.org/ckfinder/userfiles/files/84764056981.pdfIn PDF document text
    • 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_off0000b8e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB8E5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d0fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0FC 10540 bytes
SHA-256: 7551e0f5314ecab0b39c38943bb3e3d6b07516d64b5fc7b2e21a62e475ee055c
font_02_sfnt_off0000e8b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8B4 16764 bytes
SHA-256: 167562e3d65c87e8f1edd78729c612989bfb7e4336ce99f5ee75475c4db3bc38

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