Malicious PDF — malware analysis report

Static analysis result for SHA-256 d04c42fa92648bd7…

MALICIOUS

PDF

74.8 KB Created: 2021-03-10 18:21:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f5bf2444926f75b39f6b8c3f8e27eff7 SHA-1: dcbf8d0cf431148b986a86e684a8cfe4f105c88b SHA-256: d04c42fa92648bd79cb388e889e7cbd3e0db394dc0f2894e76b359a177160892
186 Risk Score

Malware Insights

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

The PDF contains a significant number of external links, identified as a link farm, suggesting a phishing or SEO manipulation tactic. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards the document being used to redirect users to potentially malicious sites, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://xajibur.ru/123?utm_term=all+dj+manish+song
    • https://bewogataxatux.weebly.com/uploads/1/3/2/6/132695278/1683871.pdf
    • https://wesuzimowigimeb.weebly.com/uploads/1/3/4/7/134745326/simikakuzumaf.pdf
    • http://chempion.coffee/cen_tech_battery_charger_recondition_modetk1gm.pdf
    • http://com-copyrighit.com/240427363613dyhp.pdf
    • https://bigonukoduxa.weebly.com/uploads/1/3/2/7/132741189/4ea568ecb1965e.pdf
    • http://all-gopro.com/301974774056v2gp.pdf
    • http://fruct.space/tenis_beira_rio_plataforma_branco6t1eb.pdf
    • https://nifonafepo.weebly.com/uploads/1/3/5/3/135319448/1e3c40044595.pdf
    • https://dukiferuxol.weebly.com/uploads/1/3/0/8/130873869/2242729.pdf
    • http://tiktokcopyrighthelpteam.com/kerala_weather_report_liveps1ow.pdf
    • http://trells.space/216997454618t9kd.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/farefasejikap/pobuf.pdf
    • https://6e8b94c7-278c-4a65-9c30-8d61c93a8f31.filesusr.com/ugd/9ff9b8_7e609425e9cc43fd9727c63c2d56dcd8.pdf?index=true
    • https://uploads.strikinglycdn.com/files/b4b11ccb-2085-4864-9809-8cd3e4b84928/vocabulary_workshop_level_c_unit_7_completing_the_sentence_quizlet.pdf
    • https://s3.amazonaws.com/fofeguj/vekaxikuxulogawuwugife.pdf
    • https://uploads.strikinglycdn.com/files/76539418-8e58-4991-9c61-0b3bb917b983/55487503331.pdf
    • https://6440a9f6-5e82-4153-977b-4ffe9374ec4a.filesusr.com/ugd/7182f3_8b87bfff96f744619618b90057d714d5.pdf?index=true
    • https://uploads.strikinglycdn.com/files/3b3952f4-6fb0-439a-97ee-718b11a2a7b2/general_chemistry_linus_pauling.pdf
    • https://a8a70d16-e3f0-4805-b115-4d8c62c40b57.filesusr.com/ugd/82e28d_e979ae48366f47fa9d565471ca16e9f0.pdf?index=true
    • https://uploads.strikinglycdn.com/files/90c86759-5de2-4f98-9cea-ec4f977ab5c0/1979_skamper_pop_up_camper_weight.pdf
    • https://uploads.strikinglycdn.com/files/0c84c6c4-a7bb-4565-b22f-17c4da383fa1/dowilarudiwix.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_off0000e852.bin
9d4b6bb8007ba624ffcfce3a2de8d96b108b9fef0f33b2649280b9f64e3ce8a0		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE852 5208 bytes
font_01_sfnt_off0000f9e7.bin
48854e1f3885b38cf4b971c85fb43cc19f03d0121c74026fd6522d8232b3ab21		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF9E7 10560 bytes

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