Malicious PDF — malware analysis report

Static analysis result for SHA-256 469b34260d7032c5…

MALICIOUS

PDF

96.4 KB Created: 2021-03-03 15:22:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 4b7547e691273c47148a8ce2b1262bf7 SHA-1: d85f9b06298865498f7f0871038f9763945b8d6f SHA-256: 469b34260d7032c5febe59a2db966d453954ed64facc0a07869de82b80e55966
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external links, many hosted on disposable domains, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, common in phishing campaigns. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://xezojetit.ru/123?utm_term=skyrim+the+fallen+esbern+bug
    • https://xudagemiribu.weebly.com/uploads/1/3/1/3/131378943/62d3c.pdf
    • http://igme.site/xeraretisarobi0821.pdf
    • http://lifeit.pro/printable_butterfly_wings_templatel2j4u.pdf
    • http://get3creditscores.info/59269846306g4f3s.pdf
    • https://kotutoxegaru.weebly.com/uploads/1/3/2/6/132695780/248186.pdf
    • https://gumosoxegobekij.weebly.com/uploads/1/3/3/9/133999275/dutazano-fatitolugem-savegewexi.pdf
    • http://fly-drive.online/2020_nsfas_application_form_downloadd4y3q.pdf
    • http://prodson.space/155593779281bleb.pdf
    • http://thehensleys.org/sig_p229r_dak0yt20.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://tuwidapaj.epizy.com/pangolier_item_guide.pdf
    • https://s3.amazonaws.com/baxekojojexusol/dragon_age_origins_gameplay_guide.pdf
    • https://s3.amazonaws.com/mikibetiv/toro_power_clear_721_e_manual.pdf
    • https://s3.amazonaws.com/wutogugej/what_happens_at_the_end_of_vampire_diaries_season_7_episode_19.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License
    • http://scripts.sil.org/OFL

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001473c.bin
c44e4304800507a94ec83dedbc8ec0105c1b70a9018b5e29d8a4107f858723eb		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1473C 26176 bytes
font_00_sfnt_off00010c47.bin
dbb94a0d81a0d517d7a28ebfb9422f558f6aeb57e05322c7bad7525fa210b985		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C47 5588 bytes
font_01_sfnt_off00011f2a.bin
d8681c6695657880dd47af41578ec8912a09a2077956280ed4bcc8822bbe5153		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11F2A 12708 bytes

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