Malicious PDF — malware analysis report

Static analysis result for SHA-256 5795da609ca73d33…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 15:14:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 0b9e8dd55e54b572d3966bfe17831c47 SHA-1: ef20352eb62f809bb34399da076c4d47b0ffda9f SHA-256: 5795da609ca73d33f88502777a259e481b222fb479531984e4e7dec0b763b969
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. Heuristics identified it as a PDF link farm with numerous distinct hosts, suggesting a tactic to obscure the ultimate destination of the links. The embedded URLs, particularly those associated with the link farm heuristic, are considered high-priority IOCs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://organicearthfiji.com/documents/file/terabutasup.pdf In PDF document text
    • http://uitvaartverzorgingsindex.nl/images/uploads/lutabif.pdfIn PDF document text
    • https://seerupit.dk/assens/file/najividotarojufanofodege.pdfIn PDF document text
    • https://on-the-markmarketing.onthemarkmarketing.com/userfiles/file/luvinejajejujodobuwulozob.pdfIn PDF document text
    • https://needletherapy.eu/upload/file/74913144522.pdfIn PDF document text
    • https://delphin-bau.com/ckfinder/upload/files/fevig.pdfIn PDF document text
    • http://veronikavilla.hu/userfiles/file/40041641134.pdfIn PDF document text
    • https://qeyeoptical.com/ckeditor/ckfinder/userfiles/files/59475446074.pdfIn PDF document text
    • http://uklearningnetwork.com/userfiles/file/10262521892.pdfIn PDF document text
    • http://saaretravel.ee/images/file/4147186132.pdfIn PDF document text
    • https://dammesliepas.lv/ckfinder/userfiles/files/wuwexazuse.pdfIn PDF document text
    • https://karinbentum.nl/uploads/file/83707874764.pdfIn PDF document text
    • http://jiab.net/userData/board/file/laxupemedo.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/86806313571.pdfIn PDF document text
    • http://fairway.cc/images/blog/file/79564758398.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/piwiloledelidorizodupu.pdfIn PDF document text
    • http://palestraarkadia.it/userfiles/files/wadixakefo.pdfIn PDF document text
    • https://ms1oke.com/contents/files/wunopapabedazudoxo.pdfIn PDF document text
    • https://kimcert.com/E/file/10998719653.pdfIn PDF document text
    • http://bagiez.com/userfiles/file/tofemakelixa.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/PmAiG5ZyT-k/uplcv?utm_term=health+during+the+industrial+revolutionPDF 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_off0000aed2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAED2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E9 10684 bytes
SHA-256: 1f161bf7785953bc9a5b459c21b4687fe235bca8236e48afc585677f2bc7c2db
font_02_sfnt_off0000df18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF18 15784 bytes
SHA-256: c9efa111eaa62d07fd2012213e73083c08dde4b5d643146208e1dc847fb6e571

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