Malicious PDF — malware analysis report

Static analysis result for SHA-256 35056c1af39d7fb6…

MALICIOUS

PDF

71.8 KB Created: 2021-01-08 08:06:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 424a0d540695bdcb46586e1ee6d02bb1 SHA-1: b6c9516debaa5860f4d73d7b18be1e9b15fc4df6 SHA-256: 35056c1af39d7fb637d82eb7ea01108be06d210fac4e884ae5788b11b1bb0df9
96 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains an embedded URI pointing to a suspicious domain, likely intended to redirect the user to a malicious site for further exploitation. The document body, though heavily obfuscated, suggests a lure related to downloading a resource.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://trafffe.ru/123?utm_term=from+neuron+to+brain+nicholls+pdf+download PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4498330/normal_5febd44a8b732.pdfIn PDF document text
    • https://vejazisiji.weebly.com/uploads/1/3/0/9/130969480/kafibadizulo_bategalubikes_tuwelu_sadopu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375507/normal_5f94cfcb3babd.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4444875/normal_5ff5d687a5cb1.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/ihHidJ5/weed_killer_for_lawns_granules.pdfIn PDF document text
    • https://cdn.sqhk.co/xelalizogim/ieifgft/creepypasta_amino_english.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428069/normal_5fa3f061291f8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423454/normal_5fc44c0e5e6a4.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/jfHp7jh/zumakujarodujipazo.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/b87eeb45-211b-4975-a151-0f5882400e0c/4960608672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d1754862-52a2-41ba-80e2-de7f94446cdc/fesewonasafatem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02f7d677-8bfb-4895-9b4e-8f33968686a7/tinder_apk_mod_2020.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d8f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD8F9 5584 bytes
SHA-256: fc8c2479b5fbe990742bf01339cb57eaf1a3f6058f23b703dbed1229164ad0bf
font_01_sfnt_off0000ebd6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBD6 11576 bytes
SHA-256: 1abf5e9cf52f5fff7265d2bb9717b7d3ffa4ab4f4cee1d0b80e5455e36136163