Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1319a8fab578c4e…

MALICIOUS

PDF

73.0 KB Created: 2021-06-09 16:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: ceaabfd3d3fb9b8dbe9068917553340e SHA-1: 3cfbba1d8ab0d0bf38220bb554bf02a680e2f579 SHA-256: a1319a8fab578c4e7447693da3c8efa4d317afbe39c35092ff0d975f6d4bf18b
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a primary external URI pointing to 'https://inwebjor.ru/pbw?utm_term=how+to+beat+kino+der+toten'. This URL, combined with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM', suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing.

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://inwebjor.ru/pbw?utm_term=how+to+beat+kino+der+toten PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427104/normal_602144b85e064.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/4018033.pdfIn PDF document text
    • https://sebanibukuj.weebly.com/uploads/1/3/4/3/134354661/052350d9b4.pdfIn PDF document text
    • https://tazokadenu.weebly.com/uploads/1/3/2/6/132695553/wakiminobopir.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454694/normal_606b0d14bd90f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426557/normal_600ea517a0e10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://ropotupi.pbworks.com/w/file/fetch/144497652/modele_attestation_de_travail_gratuit.pdfIn PDF document text
    • http://jadubunid.pbworks.com/f/8720910912.pdfIn PDF document text
    • http://wiwudoje.pbworks.com/f/thinking_functionally_with_haskell.pdfIn PDF document text
    • http://wenitudodub.pbworks.com/w/file/fetch/144625410/pejesinasox.pdfIn PDF document text
    • http://zepadatoju.pbworks.com/f/mafikaxerazewali.pdfIn PDF document text
    • http://kiwuwas.pbworks.com/f/10818074812.pdfIn PDF document text
    • http://fiwonotexo.pbworks.com/w/file/fetch/144686190/46938865866.pdfIn PDF document text
    • http://katafuzum.pbworks.com/f/bajirao_mastani_full_hd_movie_filmyzilla.pdfIn PDF document text
    • http://mumubib.pbworks.com/f/74302353449.pdfIn PDF document text
    • http://vazesuna.pbworks.com/w/file/fetch/144509100/the_absolutely_true_diary_of_a_part-time_indian_chapter_1_questions.pdfIn PDF document text
    • http://bemulopawed.pbworks.com/f/14485451042.pdfIn PDF document text
    • http://munonoraze.pbworks.com/f/kamutazix.pdfIn PDF document text
    • http://lokuwulixit.pbworks.com/w/file/fetch/144718386/91158230538.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_off0000e356.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE356 4868 bytes
SHA-256: f30e8c179899be47347e00cad8edb449f03b37e94ef4badbda76cadff44752ea
font_01_sfnt_off0000f3fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FE 10396 bytes
SHA-256: b60a3b0e1a27e655f81a3759f5e205dad47aeeefc73fa90718159c9cfa574682

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