Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a7ed3c46134d91a…

MALICIOUS

PDF

84.0 KB Created: 2021-04-27 22:55:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: f27e0ebede9a0e7699cbc8e49dfd103d SHA-1: 7ce4cc0eb646249c4ece36b3fa3224c9ced37feb SHA-256: 0a7ed3c46134d91ad51c7be6e0c17fedb08686fc564a77c367b4e141e10346bf
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, pointing to various domains. One such link is https://mezovuduw.ru/strik, which is likely used to redirect users to malicious content or phishing pages. The ClamAV detection and ML classifier also strongly indicate malicious intent, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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 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.
  • 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://mezovuduw.ru/strik?utm_term=seasonal+unemployment+definition+wikipedia PDF link annotation
    • https://cdn.sqhk.co/wevexifimur/3ihsjgh/avengers_game_beta_xbox_date.pdfIn PDF document text
    • https://cdn.sqhk.co/disegivoji/5xl8shh/pixx_band_wikipedia.pdfIn PDF document text
    • https://cdn.sqhk.co/nogorodizet/KcE1iaq/kewefanaxi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4382781/normal_5fdab453c29da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4375209/normal_5fdbd41ee66ea.pdfIn PDF document text
    • https://cdn.sqhk.co/joziroluxu/hji7ihl/among_us_mod_menu_always_imposter_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/kawurefeki/hihhhak/oldies_music_radio_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387235/normal_604dd117088ad.pdfIn PDF document text
    • https://cdn.sqhk.co/bepemuno/jjbhdlp/bekidukedirofewedibun.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414167/normal_602d3f44938e4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4412591/normal_5fd9cd0e421b0.pdfIn PDF document text
    • https://cdn.sqhk.co/kimorotadopo/ciggh7K/combat_assault_shooter_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/iXihVtv/cool_synonym_formal.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470703/normal_5fe6e275152d0.pdfIn PDF document text
    • https://cdn.sqhk.co/jivazufevi/cTLRgiW/music_rock_and_roll_racing.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/zinudipir/gutak.pdfIn PDF document text
    • https://s3.amazonaws.com/lezerawe/gijazabo.pdfIn PDF document text
    • https://f039f7e9-c7fa-441d-bf3d-2f0e35d6be10.filesusr.com/ugd/80685d_740908fa4bfa48d59267567da148f5ea.pdf?index=trueIn PDF document text
    • https://367e539a-c541-4439-991c-4bf2bef2aa7a.filesusr.com/ugd/77d535_4ff1824508634a55bc57dafd2dada0b1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/widuxade/48215768464.pdfIn PDF document text
    • https://s3.amazonaws.com/bulujono/petty_cash_book_format.pdfIn PDF document text
    • https://s3.amazonaws.com/wivunonovef/asme_journals_template.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_off00010bd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BD2 5452 bytes
SHA-256: 30e44ff7125ac42c98245449a624889b9dc4747947e496d4e2a953695d271496
font_01_sfnt_off00011e6c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E6C 10360 bytes
SHA-256: aa335be963dc983fcfb7c8c5ef61c9b7ce7e0daaedd7c4f9355dc826ec45f03b

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