Malicious PDF — malware analysis report

Static analysis result for SHA-256 77af195fd9bb08c1…

MALICIOUS

PDF

74.9 KB Created: 2021-01-25 07:41:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: d8c5043632a77df97402f5e3a1c3b56f SHA-1: e96277fe4ae498a2e141d402706bb2dd0229f37a SHA-256: 77af195fd9bb08c1ee362feee3e31e63a7f6b81281c8d12c10a710d227bab04a
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to PDF files, suggesting a link farm or SEO poisoning tactic. One prominent URL, 'https://trafffi.ru/123?utm_term=how+much+is+a+carton+of+camel+cigarettes+at+walmart', indicates a lure related to cigarette prices. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the structure points to a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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://trafffi.ru/123?utm_term=how+much+is+a+carton+of+camel+cigarettes+at+walmart PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4462056/normal_5ff8b0d39408a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390638/normal_5fe911ef233f7.pdfIn PDF document text
    • https://rinixupikexem.weebly.com/uploads/1/3/4/0/134096042/letulu.pdfIn PDF document text
    • https://danikobunib.weebly.com/uploads/1/3/4/7/134755608/2710953.pdfIn PDF document text
    • https://cdn.sqhk.co/wifopuzuxiba/iTgeg25/31484005344.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379482/normal_5fee76c27c609.pdfIn PDF document text
    • https://juvosibizojeguw.weebly.com/uploads/1/3/4/0/134040958/befutamegaxavo_waxifam_vukanaw.pdfIn PDF document text
    • http://gedagefi.22web.org/angry_birds_transformers_apk_latest_version.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380084/normal_5fcc7f756ce22.pdfIn PDF document text
    • https://cdn.sqhk.co/difanemifal/cjcgjMR/dungeon_defenders_progression_guide.pdfIn PDF document text
    • https://zugufirit.weebly.com/uploads/1/3/1/1/131163535/ganifabunedop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4374699/normal_5fed69f5a74be.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487208/normal_5fd2d447e3653.pdfIn PDF document text
    • https://cdn.sqhk.co/juzurupivepo/heQIqyd/27620752455.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4377935/normal_5fe975524b3b2.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/iegdGje/space_runner_game.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470832/normal_5fee6fcac7930.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413002/normal_5fd302a9a5baf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nadiripu.epizy.com/10th_class_result_2019_faisalabad_board.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_off0000dfed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFED 5348 bytes
SHA-256: 441c4779dd89eec54a495c296ab52bd8949bedf2b8fffa4e063b7c16fa47cc3b
font_01_sfnt_off0000f208.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF208 14340 bytes
SHA-256: 8b6c949fb876f819acb1f78b2d4f26581c081833b6a2a3b15832c79c6a2d542d

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