Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2cf30d8f6e13ff…

MALICIOUS

PDF

69.9 KB Created: 2020-12-19 12:53:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-26
MD5: e3c6fee76d82026a14e04371f968541d SHA-1: bf70ebcb085223cc71664063b9a0d017302a9d0a SHA-256: df2cf30d8f6e13ff9ed71ef0a7f2efaf2b800f204dbb0ab96cdfcf6b9a27c6a3
96 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains an embedded URL that appears to be part of a lure, referencing a common printer issue to entice clicks. The document body, though heavily obfuscated, contains text fragments related to the printer issue and the wkhtmltopdf tool, suggesting it was generated programmatically to present a deceptive interface.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://trafftec.ru/strik?utm_term=hp+officejet+pro+8600+plus+problem+with+ink+system PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4421472/normal_5f9851ce7c858.pdfIn PDF document text
    • https://gijogolip.weebly.com/uploads/1/3/4/7/134755622/keronosofiv-gajasowixeti-bofezilog.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408184/normal_5fdcc06f41a66.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382429/normal_5f91d4911c593.pdfIn PDF document text
    • https://masogipu.weebly.com/uploads/1/3/1/6/131606875/dotora-nutulog.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483624/normal_5fb6cf4f08dc2.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/75a63690-6e65-45e1-8696-4136ff7cf38a/5528172561.pdfIn PDF document text
    • https://s3.amazonaws.com/desenaz/rdr2_online_money_making_guide_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/28223e02-c49e-4ec1-95ce-042f1b3cc818/iglesia_de_efeso_su_historia.pdfIn PDF document text
    • https://s3.amazonaws.com/vetamedisoz/what_is_r3_zoning_in_charlotte_nc.pdfIn PDF document text
    • https://s3.amazonaws.com/nowokil/nujasa.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc79f8081da8a590db1a476/t/5fd6a46089566e781f599628/1607902305799/cucumber_json_report_parser.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_off0000d1c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1C0 5972 bytes
SHA-256: 4b6394d6c430d6287fb151b3a3b5ddbeb7064b6443ccb6264b65c3c2ad27d469
font_01_sfnt_off0000e603.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE603 10740 bytes
SHA-256: 53ee22f9a69c03832d0d377e862238fc4fe3cd425c038669e3d17b4576cc7630