Malicious PDF — malware analysis report

Static analysis result for SHA-256 125da139fe6dbec5…

MALICIOUS

PDF

87.5 KB Created: 2021-03-15 18:31:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: ab7b588aa6952923c619a0bc9c3e3a49 SHA-1: 20ad7a83c2c5e5a8ee1f0114620b1c020f592d64 SHA-256: 125da139fe6dbec51ad7dee90f913bc55516a4f07bbe40eaba5dcda1a7ef257e
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/strik?utm_term=what%2527s+the+difference+between+vitamix+e310+and+e320 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416927/normal_603848040021d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449177/normal_5fd7a69299e18.pdfIn PDF document text
    • http://femalukus.iblogger.org/nedelavejesotozojivenik.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416500/normal_5fe92b5ea4a62.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470016/normal_5fcb036bc02a0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449984/normal_5ff8c4d2de1ef.pdfIn PDF document text
    • http://tadosuzewamu.medianewsonline.com/79383582344.pdfIn PDF document text
    • http://motarojetox.sportsontheweb.net/arris_tg1692a_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417990/normal_600bd0a8b0037.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404740/normal_60255e55553f4.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
    • http://tibepaxun.rf.gd/physics_textbook_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36285e23-3d7a-4fa2-8ebe-14ea2d72e930/robidiwijizumot.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de9ce924-c70f-4feb-ba4a-e2a0e59507e2/nutrition_diagnosis_terminology_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b0a81f2b-e57d-4b04-9cc6-4cc3b4516868/allen_bradley_1794-aent_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5af1bb21-c700-4530-be98-6f2aa68c18b1/mewid.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a36b196a-d57f-4ad0-9bb1-b017e6429842/philips_pasta_maker_recipes.pdfIn PDF document text
    • http://zatofax.rf.gd/best_bodyweight_workout_plan.pdfIn PDF document text
    • http://kinovogofidi.rf.gd/59313051173.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a780526-dadf-44fa-a37e-76db6b8b3ebb/zumop.pdfIn PDF document text
    • http://bitenozof.atwebpages.com/what_kind_of_business_expenses_can_i_write_off.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_off000106a0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A0 5804 bytes
SHA-256: 418589b22f00fa5b02dc1cb6fb84d8df7939fe661fa8b829ec2a454d27a02216
font_01_sfnt_off00011a4f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4F 11192 bytes
SHA-256: c787890b30d363a50e0aa3c51d9f70fe99cce2618cf431efe54801a4fc726bd7
font_02_sfnt_off00014050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14050 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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