Malicious PDF — malware analysis report

Static analysis result for SHA-256 0ecc4624dff3c3ee…

MALICIOUS

PDF

96.2 KB Created: 2021-02-23 07:36:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 79c97e6889a6412e4e85e7ef7b384d65 SHA-1: 7ca6e0612aba9d1a4731101fc4344f2ab4bba1c9 SHA-256: 0ecc4624dff3c3eef13db74fdf6b35734f5ed765c7c7c191e64c5cee566298b8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating it functions as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jacksth.ru/strik?utm_term=steins+gate+closing+song PDF link annotation
    • http://lesifipi.22web.org/ace_academy_rrb_je_test_series.pdfIn PDF document text
    • https://lixazasowab.weebly.com/uploads/1/3/4/5/134588429/7993265.pdfIn PDF document text
    • http://pipvip.ru/monthly_expense_sheet_template_excel9xtzk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500432/normal_601759f9b3b18.pdfIn PDF document text
    • http://bogplaktnc.fun/nor_baccarat_manual0pxzq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443342/normal_5ff694384e94d.pdfIn PDF document text
    • http://lemixebu.22web.org/98029730537.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zotapem.rf.gd/24495907517.pdfIn PDF document text
    • http://vowaderisosalel.epizy.com/43237005915.pdfIn PDF document text
    • http://bezopiwuzalobit.rf.gd/79700754341.pdfIn PDF document text
    • https://s3.amazonaws.com/pevarijidasalop/96139932551.pdfIn PDF document text
    • http://kagapoxarizi.rf.gd/what_are_the_irregular_imperfect_verbs_in_spanish.pdfIn PDF document text
    • http://givobodetaruzo.epizy.com/harry_potter_and_the_half_blood_prince_full_movie_facebook.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/bipuzurev.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010ce8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CE8 5144 bytes
SHA-256: 079cf6aaf610607ceb6287d7679f74fd538eaceb7f3828a997978f8bbd523617
font_01_sfnt_off00011f05.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F05 4972 bytes
SHA-256: 6c9326859c1fd3cd054a441fabdeaac9288490309313dd5c0865f591dc4de5b3
font_02_sfnt_off00013000.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13000 12960 bytes
SHA-256: a6830929d79cda847e2443e8e1a1562d33fa979c048c3d488f00da1e88426a1f
font_03_sfnt_off00015aa1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15AA1 17036 bytes
SHA-256: 68878d024fbc91cec42362ee728f7473b4ce8749eb8c5335e18cd7b0a2f4b725

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