Malicious PDF — malware analysis report

Static analysis result for SHA-256 f51e438acd395943…

MALICIOUS

PDF

95.0 KB Created: 2020-11-24 10:22:46 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: d6d6ff069b68270109cff4b67978a417 SHA-1: 9edd6cb69d12598f6c35df7d922998d397e8ea19 SHA-256: f51e438acd3959434d740629300f69763a24bd379b62f85fb3894451aa2398b4
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many pointing to disposable domains and Weebly-hosted PDFs, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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 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.
  • 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://traffset.ru/123?utm_term=el+santo+rosario+lunes+amen+comunicaciones PDF link annotation
    • https://xenexaguvu.weebly.com/uploads/1/3/4/2/134265948/rikekewameros.pdfIn PDF document text
    • https://vavemome.weebly.com/uploads/1/3/4/6/134609594/1207505.pdfIn PDF document text
    • https://gifitutopa.weebly.com/uploads/1/3/4/4/134470147/749243.pdfIn PDF document text
    • https://xojerajap.weebly.com/uploads/1/3/1/3/131384359/abf7257efc49.pdfIn PDF document text
    • https://gekizunelim.weebly.com/uploads/1/3/4/8/134883517/2799123.pdfIn PDF document text
    • https://wawodupalise.weebly.com/uploads/1/3/4/6/134621762/gapezimumupoxi-mugupuzivonu-lames.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381095/normal_5f90d4e95322b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465393/normal_5fba3e1e80896.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/jomajawisejonif_lekomeset_vipakuxim_pukufadox.pdfIn PDF document text
    • https://tuledekubixa.weebly.com/uploads/1/3/4/7/134722649/negifevog_xinabusete_sadiferer_nosoletumi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/654947d8-3f2b-485d-be78-49c3e8fe38da/pathfinder_eldritch_knight_feats.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28e55224-ede2-4f89-91d1-71a609aed488/sony_dream_machine_auto_time_set_icf-c707_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49a0af6d-93ee-484c-aabc-903d2198e29b/lixonasexatotoruwumij.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6400691-ee54-4243-b07a-4265ca86f5ee/68766748808.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9f0dc0e-1256-48e9-b357-725ee06ac2b7/59382514262.pdfIn PDF document text
    • 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://scripts.sil.org/OFLIn 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_off00011fd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD3 4904 bytes
SHA-256: 16fc95f990d99e2c66ba4ed69a6b9eec8c18a5ba4ccea21d3bf993cce8d771f8
font_01_sfnt_off00013067.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13067 11912 bytes
SHA-256: f4f28ab56c70f97579d887b21f58675331bdc7e703a24f0be1e2014d04e54a64
font_02_sfnt_off00015798.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15798 16108 bytes
SHA-256: 8890efa2908b922876064fcfb5cfdb5fcd794e041991dcd9a695b9257a4ea440