Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3585959219cc2ac…

MALICIOUS

PDF

87.2 KB Created: 2020-12-26 23:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 2d08da7030ee57732db21a08f63ed1cd SHA-1: 8bd7f98f717358e161cfad71643b5955259baf5f SHA-256: b3585959219cc2ac0170c511298b5a133cc8f51017f83a3cb5e534a7621482eb
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, with a critical heuristic identifying a link farm pointing to external PDFs. One of these external links, 'https://trafffe.ru/strik?utm_term=jelly+lam+shifter', is flagged as suspicious and likely serves as a lure. The ML classifier and ClamAV detection strongly indicate malicious intent, consistent with phishing or malware distribution via a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://trafffe.ru/strik?utm_term=jelly+lam+shifter PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fb3014c13aab.pdfIn PDF document text
    • https://jotujovogubiraf.weebly.com/uploads/1/3/4/6/134627891/0db83a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495262/normal_5fda4c0d64206.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426974/normal_5f9fd5075ae45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371800/normal_5fa14fb0c59e3.pdfIn PDF document text
    • https://natuvowefuzun.weebly.com/uploads/1/3/4/5/134516005/jexasatokamede.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382193/normal_5f8c95a9dc0da.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://s3.amazonaws.com/kakef/software_quality_assurance_plan_template.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48485d2c-f9ee-4cba-a5c9-b0cbae65f4fd/ralph_lauren_river_guide_pant.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c574f4bb-2c1f-4a9f-96ad-f5f2f92af9e7/properties_of_alcohols_and_phenols_lab_report.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/89410f7f-a71b-4fe2-a0d6-7fcf4273f9bd/davie_police_department_records.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c07b01dd-5f76-4910-b09a-e2271862fe78/vajigobuvosa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7830bd64-02ce-4772-9101-875becde82a8/xelawopotagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ead10575-0743-4c1e-bfab-695628efa558/s14_auto_to_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/ritoma/autocad_blocks_free_dwg_file.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

Related samples 8

Ranked by shared artifacts, heuristics, extracted URLs, CVEs, and signatures.

Full JSON: related samples API

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0AA 6412 bytes
SHA-256: 0f78577d93aa895459b510975a756c4296dc837afa14fca8ea787630aab87024
font_01_sfnt_off00010690.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10690 4672 bytes
SHA-256: a46393bcb5a7fdbb3cf07ec1f6c5f72fb1eda15546a5c451e2b0fc7e2e4f7359
font_02_sfnt_off00011667.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11667 13908 bytes
SHA-256: 357770ca720622742e0002aa146486a94402860a082740190759c5386174db16
font_03_sfnt_off000141c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x141C5 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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