Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c04bd4c3d8f3670…

MALICIOUS

PDF

70.4 KB Created: 2021-04-14 12:25:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 3690c56ece0fffd2471f77efb01b26cf SHA-1: f0cafc458c3c02fb68dfae2330d4ff1eb0f85656 SHA-256: 6c04bd4c3d8f3670a1acd2331b58ab8e8dd838545059e2b966f81399d8eb5472
134 Risk Score

Malware Insights

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

This PDF document was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. It contains numerous embedded URLs, with one prominent URL pointing to `vilenefex.ru/strik`, suggesting a phishing or redirection attempt. The document body, though heavily obfuscated, appears to be a lure related to a forklift manual, aiming to trick users into clicking the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://vilenefex.ru/strik?utm_term=caterpillar+r80+forklift+manual
    • http://popubim.iblogger.org/mutufolegenufawopojeguzew.pdf
    • http://jexemukanofefoj.iblogger.org/rijesunaliriviji.pdf
    • http://kajipim.mypressonline.com/89373653327.pdf
    • https://jixusalozexifan.weebly.com/uploads/1/3/1/4/131407855/c54e0.pdf
    • https://taxirexojonub.weebly.com/uploads/1/3/4/7/134767272/losebusevogav_zixavuwa_fanasifu_leranumip.pdf
    • http://brandframeb.com/triade_de_cushing06068.pdf
    • http://investorlands.ru/accounting_standard_26_icaie7d6b.pdf
    • http://zarewubizeno.mywebcommunity.org/tolitosabesi.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://30c0d994-bee2-4d79-bc91-d4aaa7251653.filesusr.com/ugd/0962d9_2200a0ce4358442b8749c111b254cedb.pdf?index=true
    • http://gesorowar.rf.gd/effect_of_substituents_on_basicity_of_aromatic_amines.pdf
    • http://biwosagamivi.myartsonline.com/ace_academy_books_for_eee.pdf
    • https://uploads.strikinglycdn.com/files/699242c9-35c2-4823-8ce4-b85bf9a24df1/nuvarofovobov.pdf
    • https://aabf49e0-5477-4fd2-8456-a986ef8f2a87.filesusr.com/ugd/9e14ca_15efcd4a852b426bad0b569d8e66c58b.pdf?index=true
    • http://midarofezit.rf.gd/74221079004.pdf
    • https://34886cf3-15ed-44db-93e8-8979dc7c4cd7.filesusr.com/ugd/ea2c45_c76782ff63294b52adf243cda0e91100.pdf?index=true
    • http://wolobugoxew.myartsonline.com/48477644626.pdf
    • https://uploads.strikinglycdn.com/files/2ade14c1-4b27-4af9-bb1d-1f5941e6f386/how_to_use_viewsonic_projector_remote.pdf
    • https://52431b39-7396-4b0c-bcaf-ab72d449a1bf.filesusr.com/ugd/f8cef3_434b2f011d784c9792a33c0449aff22c.pdf?index=true
    • https://765a5d72-5774-4a4d-a421-5c90307110ba.filesusr.com/ugd/f2a868_227fe9171e7d44588eb2b45a65419269.pdf?index=true
    • http://telimagafire.epizy.com/adjetivos_comparativos_en_espaol.pdf
    • http://zevesijuduma.atwebpages.com/19993118037.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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d3f0.bin
7064905f6ede6c80b1ae396ad1bd674d43cfaf64aee9b00f81ab4d1cc6cc7bce		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD3F0 5176 bytes
font_01_sfnt_off0000e576.bin
d468a2bbc5c296fbe4c6950db366449c363e15772bc91a6b70be2bd97577787b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE576 11456 bytes

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