Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6ff2b6d520441c6…

MALICIOUS

PDF

83.6 KB Created: 2021-03-29 05:32:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 0dec3db1838651a3795c794a865e629e SHA-1: 38827a5ff7173a3aa367a4535b5889aa7f1b12ee SHA-256: c6ff2b6d520441c6088dee0492d3b46b0d3377cd9113d24d94400f62305b5fe3
156 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic. One of the primary external links points to a URL that appears to be part of a malicious campaign. ClamAV also detected the file as a 'Pdf.Phishing.Trojan'. The presence of embedded URLs and the overall structure suggest a phishing or malicious content distribution attempt.

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=present+simple+questions+exercises+pdf+macmillan
    • https://cdn-cms.f-static.net/uploads/4382406/normal_601e1a68e14b1.pdf
    • https://cdn.sqhk.co/kuzetuzame/ejdmVsS/lomuwipagumomigizasoj.pdf
    • https://cdn-cms.f-static.net/uploads/4468837/normal_60525f9201230.pdf
    • https://cdn.sqhk.co/regomesu/hgqjhe2/podunudonolupidewuzaruka.pdf
    • https://cdn.sqhk.co/jojevirelo/hdBifjg/back_wars_mod_apk_rexdl.pdf
    • https://static.s123-cdn-static.com/uploads/4382972/normal_5ff66a98cf3b9.pdf
    • https://cdn-cms.f-static.net/uploads/4444636/normal_601e56d2234e1.pdf
    • https://cdn.sqhk.co/bizujutenifo/eieHHhf/solar_system_super_simple_songs.pdf
    • https://cdn.sqhk.co/forinabam/hfg6ghM/gozejiluganukufuzowusevo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/nonabafat/derilufebaxifawoki.pdf
    • https://uploads.strikinglycdn.com/files/0595f106-b488-41fa-81d8-67b0ce41b4cb/33988887101.pdf
    • https://e6f9d1db-9bad-45ba-a188-0e8e378e8087.filesusr.com/ugd/99b222_c34c004fd17d452294398848aff80ac1.pdf?index=true
    • https://s3.amazonaws.com/jusagi/how_to_understand_college_algebra.pdf
    • https://uploads.strikinglycdn.com/files/997d4482-6e96-4a0d-ae7a-d702866986ee/panoxorivepivejoxob.pdf
    • https://uploads.strikinglycdn.com/files/bc4067ee-3232-40ea-b50b-4453bb3fb890/aguda_o_llana.pdf
    • https://46ebecaa-9490-439b-bba6-ee77f1a6ca93.filesusr.com/ugd/cee8a1_2d5ad36dfbb64b44ba7bded9d2eafcab.pdf?index=true
    • 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_off000105e6.bin
ee6ccd1d673e066d1531191f06b3c91e1fb1bf7779e605af97eaeb243351d075		 pdf-font-stream PDF embedded font (sfnt) at offset 0x105E6 5496 bytes
font_01_sfnt_off00011880.bin
add95c2b6ed914873d941cc6b0916296d84b9a28c81a40f99874a8705f2f10dd		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 12492 bytes

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