Malicious PDF — malware analysis report

Static analysis result for SHA-256 36934edc1b4fef8e…

MALICIOUS

PDF

84.8 KB Created: 2021-02-12 17:48:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4d8cbcd75dea92eb545d3dd040b84edb SHA-1: d1146c4fdde323dd3cebd4400e3ddf7d00b5d0eb SHA-256: 36934edc1b4fef8e2d1ec9911031e9bc40efe47e53f205ac13bea069504e29b1
126 Risk Score

Malware Insights

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

This PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a phishing or trojan-like behavior. It contains numerous embedded URLs, with one specifically identified as part of a link farm designed to redirect users to various external sites, such as 'http://fisuruwibowin.66ghz.com/lagu_ahmad_dhani_terbaik.pdf'. The document body, though heavily obfuscated, contains text related to 'top best graphics android games', suggesting a lure to attract users to these external links.

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 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://leonvi.ru/wb?keyword=top%20best%20graphics%20android%20games PDF link annotation
    • http://fisuruwibowin.66ghz.com/lagu_ahmad_dhani_terbaik.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410206/normal_5fcbf94027030.pdfIn PDF document text
    • https://novigavaze.weebly.com/uploads/1/3/0/8/130874354/vowelowapesew_nonit.pdfIn PDF document text
    • http://tularafujebok.iblogger.org/96549002308.pdfIn PDF document text
    • https://welavomuwaj.weebly.com/uploads/1/3/4/6/134633166/xirujo_vunesuki_bugeda.pdfIn PDF document text
    • http://wovolutoxali.iblogger.org/ranowopuw.pdfIn PDF document text
    • https://cdn.sqhk.co/lamiwifa/eYDXD8i/64237551932.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4382948/normal_6008efbba9eee.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485309/normal_5fd1be829091d.pdfIn PDF document text
    • https://cdn.sqhk.co/nonuripot/fjdidgh/winidik.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/julexekubaj/wozilurupibukaguroxu.pdfIn PDF document text
    • http://xenemusexo.epizy.com/barricade_transformers_the_last_knight_toy.pdfIn PDF document text
    • https://s3.amazonaws.com/fotojipifuzitul/calfresh_benefits_income_guidelines.pdfIn PDF document text
    • http://wepaxilex.epizy.com/skype_version_7._39.pdfIn PDF document text
    • http://mefowoweman.epizy.com/android_software_update_app.pdfIn PDF document text
    • http://muwaziri.epizy.com/company_logo_designer_free.pdfIn PDF document text
    • https://s3.amazonaws.com/tixeligufokup/jodonarezetivugadusi.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_off00010e0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E0E 5544 bytes
SHA-256: c8dde67ac36ae004c7922ccf469961b8ca13c9dda96115e8a856327c7ff0481d
font_01_sfnt_off000120b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120B1 11012 bytes
SHA-256: f00028734d2af6a8a4a171ccbeab872532e985b74bbd543ff850c1729060c982

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