Malicious PDF — malware analysis report

Static analysis result for SHA-256 86bd7258ec437149…

MALICIOUS

PDF

76.0 KB Created: 2020-12-27 03:41:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: a415052298000d8d60e0909079d9458c SHA-1: c5dc99da435a23be22f2a2cb605d55cdb5e40508 SHA-256: 86bd7258ec437149f1fcb3ce56128728ba3c559860a901939e3716e9c446c256
176 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including ML classifiers and ClamAV, indicating malicious intent. The 'SE_CALLBACK_LURE' heuristic specifically points to a callback phishing or tech-support scam pattern, where the document likely prompts the user to call a number for a fake issue. While no scripts were explicitly extracted, the presence of external links and the overall detection suggest it's designed to exploit vulnerabilities or trick the user into further interaction.

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.
  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://trafficel.ru/aws?utm_term=hortonworks+inc+annual+report PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4417314/normal_5fcd3a3c858c4.pdfIn PDF document text
    • https://cdn.sqhk.co/lawafopugu/ahbPjdy/pikidufoju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366668/normal_5fe2c12dce6e7.pdfIn PDF document text
    • https://xunitumewotoril.weebly.com/uploads/1/3/4/6/134612341/32316.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/73c28936-fca6-41bd-8fac-a3d26685d4d0/common_mistakes_in_english.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9333315e-7358-4bcc-8866-f376dc5afd4c/warship_craft_hack_app.pdfIn PDF document text
    • https://s3.amazonaws.com/lomogas/us_sheet_metal_gauge_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/baxadelefofibuz/2017_ford_focus_rs_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9e203a1a-09f2-4d82-8080-8f165023e26d/lowititupesexujex.pdfIn PDF document text
    • https://s3.amazonaws.com/bufipevuril/42892565107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/122d6ef3-0f34-4fc5-a956-a6f5b8dda698/48117864577.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_off0000dfe5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFE5 4924 bytes
SHA-256: 324a6e2943437470a3803259b2b2e602fe60b757f5edfb4fab560581b876b154
font_01_sfnt_off0000f0bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0BD 10600 bytes
SHA-256: eabf7da20ab4b239d07664cbfab117280363803e6872ad5435658b6ea4b7c103
font_02_sfnt_off000114cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114CB 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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