Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f823a2d5ae87bc5…

MALICIOUS

PDF

72.5 KB Created: 2021-02-13 11:50:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: cea9e0d42bc4e9abe70d7debcd1d992e SHA-1: 03c558740d9dae6e065ffd692af225635f534890 SHA-256: 2f823a2d5ae87bc58fdc092c86732613e202ac4619dbf30d2104e296a2cc1b72
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to a domain that appears to be a link farm designed to redirect users. The document body, though heavily obfuscated, contains text related to search terms, suggesting a lure to trick users into clicking the embedded malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/123?utm_term=dallas+flea+market+in+gastonia+north+carolina PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4482023/normal_5fcd89657361a.pdfIn PDF document text
    • http://geesecam.com/line_rider_mountain_king_gamex9jn5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4365546/normal_5fffd13f4cf86.pdfIn PDF document text
    • http://trikolor.site/causative_form_exercises_with_answers77np3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483345/normal_60172d97da03f.pdfIn PDF document text
    • http://losinglotterynumbers.com/islamic_banking_in_saudi_arabiapclw4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469358/normal_5fe1f09f9d9c9.pdfIn PDF document text
    • https://cdn.sqhk.co/pivatiwon/Ojjidij/masejogidewal.pdfIn PDF document text
    • https://cdn.sqhk.co/xomorenut/9MvNG4s/cookie_clicker_stock_market_bot.pdfIn PDF document text
    • https://cdn.sqhk.co/wanuvudeb/jdhgifV/78136051742.pdfIn PDF document text
    • http://opt05.ru/dental_update_submission_guidelinesx4tn7.pdfIn PDF document text
    • https://cdn.sqhk.co/pabelewexo/aXvhfhi/lufemibizuvibenanag.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450355/normal_5fdc3c3752955.pdfIn PDF document text
    • https://cdn.sqhk.co/reretukida/izijija/nivexegapojonesu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4466689/normal_5fec6f340d347.pdfIn PDF document text
    • http://blaugrana.ru/515901588ys1ha.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ziwibavufu.rf.gd/nylatron_specification_sheet.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_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 5360 bytes
SHA-256: 33d6a05836a051441b5f89f90601496968e67cb483b476fc68773ab3d1e541d2
font_01_sfnt_off0000f13e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF13E 10420 bytes
SHA-256: 4f34cb1e8ce932c3617e22d4543a7c61cf3e81c99abdc3392cc077e4f6b7c8d4

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