Malicious PDF — malware analysis report

Static analysis result for SHA-256 dcb9eb2e09d53d12…

MALICIOUS

PDF

88.7 KB Created: 2021-09-12 08:25:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3d542cf11e7be98149d5da4a39dd003a SHA-1: 6646705e7d44bdcae8aec60442d0437e444cbf73 SHA-256: dcb9eb2e09d53d122a706ef6d588c02332db1b22864b66b577647337e97d25e8
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, and exhibits characteristics of a link farm PDF with numerous external URIs pointing to potentially disposable domains. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic specifically flags this behavior, indicating a phishing or scam attempt. No scripts were extracted, but the presence of external links suggests a redirection mechanism to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9979

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://www.andreivieru.com/ckfinder/userfiles/files/gogofakevas.pdf In PDF document text
    • http://littlepearlspublishing.in/data/eimages/file/79619725525.pdfIn PDF document text
    • http://doks-films.com/pcms/content/file/42731265208.pdfIn PDF document text
    • http://www.puhito.hu/uploads/43006399854.pdfIn PDF document text
    • http://www.psyforyou.nl/upload/fckeditor/file/derewez.pdfIn PDF document text
    • http://ebbers-schilderwerken.nl/uploads/files/52911399232.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/subakosotarivaxabowadaxas.pdfIn PDF document text
    • http://hattingtoemrerogsnedker.dk/userfiles/file/bowasojesuwadarawaxavobat.pdfIn PDF document text
    • https://plewmal-d.com/Uploads/files/96386412126.pdfIn PDF document text
    • http://altiro.nl/home/tjerk/file/62757574456.pdfIn PDF document text
    • http://kxnjl.com/userfiles/files/mukaveruzokogivatidodawot.pdfIn PDF document text
    • http://www.aamuhsv-madisonalumni.org/files/files/gajowaxuwulibugazijewan.pdfIn PDF document text
    • http://ccshecea.org/upload/files/72561615382.pdfIn PDF document text
    • http://platcometals.com/images/file/8553138710.pdfIn PDF document text
    • http://wellogo.in/userfiles/file///kukivixijikaxa.pdfIn PDF document text
    • http://microcement.ua/userfiles/file/20027914049.pdfIn PDF document text
    • https://argekaucuk.com/nbg/upload/files/roxelotupimuruverovebeda.pdfIn PDF document text
    • https://matrainagycsalados.hu/userfiles/file/65911068487.pdfIn PDF document text
    • http://yilbasipromosyonu.com/userfiles/file/bebuzadonexuk.pdfIn PDF document text
    • https://apskarota.org/userfiles/file/votegovupusepilidi.pdfIn PDF document text
    • http://flapboxes.com/userfiles/files/befatekefo.pdfIn PDF document text
    • http://mrs724.ir/basefile/drtiketcom/files/36387065339.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/ngfLrbzwjls/uplcv?utm_term=apexonline+learning+platformPDF 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_off0000f3be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3BE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010bd0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD0 18616 bytes
SHA-256: 00f4862891cf5a033752582df007739c1111a775a1f17405fff6ecd008550aea
font_02_sfnt_off00013b2d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B2D 10616 bytes
SHA-256: de97eb81ef22190eaae326ca87010229f3b9da7054a97ec12c70e582d4917c91

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