Malicious PDF — malware analysis report

Static analysis result for SHA-256 461df1803e7a328a…

MALICIOUS

PDF

71.8 KB Created: 2021-01-25 01:00:49 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 144b7f16acf41d79ea67500cf5b16e80 SHA-1: 717ec94c50168667c8ab8008906cf8840b809d97 SHA-256: 461df1803e7a328a37c334a8940ae921d26e4d9a7ee46baaf463b5662c3dcf8b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics and a machine learning classifier as malicious, with ClamAV identifying it as a phishing trojan. The document contains numerous embedded URLs, many pointing to disposable or unknown domains, suggesting a link farm or phishing lure. The presence of external URIs and the ML classification strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafftec.ru/123?utm_term=arris+sbg6782-ac+factory+reset PDF link annotation
    • http://dvigatel.guru/didi_gregorius_stats_2020ahfr1.pdfIn PDF document text
    • http://online-bestshop.xyz/karaoke_online_sing_record_apkzni9p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383703/normal_5ffb47a3d1d11.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5ff5c70a90f25.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485166/normal_5ff401ee917ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464865/normal_5fd66f33d1294.pdfIn PDF document text
    • http://bt-management.website/pac_man_world_rally_ps4pd115.pdfIn PDF document text
    • http://greenbike.shop/podesamow1g3oe.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4486350/normal_5ffdd1f99a850.pdfIn PDF document text
    • http://clobuss.ru/86466730617jobee.pdfIn PDF document text
    • https://cdn.sqhk.co/vovusupa/eCig6id/81827778782.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bisegilupuf/binder_covers_and_spines_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/tixedujegibex/86051264568.pdfIn PDF document text
    • https://s3.amazonaws.com/ninazarila/tezokawovifal.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cfa4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFA4 2900 bytes
SHA-256: a28fcc4ba65d8171a55e8b87d646ac5d1dd213f66ab2b0026fd39e5ca5d32d1a
font_01_sfnt_off0000d9e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E6 5840 bytes
SHA-256: d0b89ed71fb329f9319b0dcbb4bb332249733b031dc76c349e281c2ea0efc746
font_02_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10608 bytes
SHA-256: 1180a57f03387a5c59aeb749993cbbce8849ec15cdb8ffdacfde8197f2ec8ff1

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