Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f610a0d903f1a14…

MALICIOUS

PDF

79.8 KB Created: 2021-03-11 05:53:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: df1a22a9201d0ec0d392c3ea5e3be66d SHA-1: 1cc587add896dc008b2c661bf3140a389777a9c1 SHA-256: 7f610a0d903f1a14e95f46b41e4fb4b3015a75a447a4507ed5ac3d1fc5c4ffab
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a phishing or link farm attack. The ClamAV detection and ML classifier further support its malicious nature. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://resalured.ru/123?utm_term=sheridan+sheet+reviews
    • https://cdn.sqhk.co/jotapepikota/gcxvdir/puwonexu.pdf
    • https://cdn.sqhk.co/xugosovemi/heR3gnn/truck_crafts_for_toddlers.pdf
    • https://cdn-cms.f-static.net/uploads/4459483/normal_60334a908672b.pdf
    • https://cdn-cms.f-static.net/uploads/4419441/normal_6023016c5383d.pdf
    • https://cdn-cms.f-static.net/uploads/4491669/normal_6025059389d5d.pdf
    • https://cdn.sqhk.co/fafaviwi/PShekjd/xizutabenajoxobuvilo.pdf
    • https://cdn.sqhk.co/perikowep/lhjJTja/lemalemu.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d920bd67-dfaf-4c99-85b0-fcb8118dfb91.filesusr.com/ugd/383849_6abf0435cdc648b1bbbb440a9571f1fa.pdf?index=true
    • https://fe426b01-1dd0-498a-b08e-7ec37e320b94.filesusr.com/ugd/6b45f0_bfcdd34163954770bb5f57d8f8ca9531.pdf?index=true
    • https://f2d828cf-06d9-46ea-85af-d88b0bc20d44.filesusr.com/ugd/501a20_30ca6d45b07046fd813238d6d06615d2.pdf?index=true
    • https://90ff81fc-98d9-4e53-96a3-aaa5c1c2042e.filesusr.com/ugd/bb5aff_99829de08eca4693b093df1d9e2c0b71.pdf?index=true
    • http://lafibuwed.rf.gd/astra_stylesheet_is_missing.pdf
    • https://7d33af4c-acfd-4996-9436-348e89828b5b.filesusr.com/ugd/289672_5cf2989c4236405680bd35a58a924399.pdf?index=true
    • https://0eb00d84-361a-45dc-b346-1af5c8eb785c.filesusr.com/ugd/d79848_66b7597680274fb19c3419845b715c27.pdf?index=true
    • https://9a60fab3-6fb0-4be7-9305-b2e3cc44d963.filesusr.com/ugd/811c4f_9cf61fdc37a1495fa5764ca1fa3e6fa2.pdf?index=true
    • https://1a441fb4-51dd-4528-a053-eb59ff664e18.filesusr.com/ugd/43d9d5_3c69a344ecef49b8ada197dc760c58fb.pdf?index=true
    • http://jamurujitexezi.epizy.com/cellular_respiration_review_worksheet_answers.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fb17.bin
0efcf52843be32e83d058f6c12647c5311cdefef41f428ac7f9e87e195807f26		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFB17 5136 bytes
font_01_sfnt_off00010c96.bin
a829645dcceec5954af757aa7a8e4c360d089a1c3b5f3378214b4eab1339db43		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10C96 11124 bytes

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