Malicious PDF — malware analysis report

Static analysis result for SHA-256 0cde6f95b8630a25…

MALICIOUS

PDF

75.9 KB Created: 2021-03-14 09:06:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-13
MD5: c217d0a482aacfa27a666da1fcf8d855 SHA-1: 55d8616279c55f91dc61ba30c9f9a08eb274070d SHA-256: 0cde6f95b8630a251fb17ae9819f9b6864e9310716f5fc0565a5d3dc7809c982
126 Risk Score

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious. The embedded URL points to a domain that is not confirmed benign, suggesting a phishing or malware distribution attempt. Although no scripts were explicitly extracted, the PDF structure and URL suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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/award?keyword=que+es+equidad+educativa+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4448339/normal_600f17de8ebe8.pdfIn PDF document text
    • http://a-trvl.ru/how_many_yards_of_fabric_to_make_a_jelly_rollqf1xr.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410985/normal_6007e18fa801d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4424364/normal_6043374f9465e.pdfIn PDF document text
    • http://temilops.xyz/gukobepazuraxufow0zfpx.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/subject_verb_agreement_worksheets_for_grade_6_with_answers.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/rogugagatuf/insulators_and_conductors_worksheets_for_5th_grade.pdfIn PDF document text
    • https://bef89f6e-6323-4b84-ad9d-a44490bfcc4f.filesusr.com/ugd/96768c_504a53356c7e45f1a2fbc497fc4643cd.pdf?index=trueIn PDF document text
    • http://jeximojela.myartsonline.com/wozid.pdfIn PDF document text
    • http://zerowegujij.onlinewebshop.net/77490788857.pdfIn PDF document text
    • https://6bfd3344-23d3-4e03-ab7d-00c1c23eecf6.filesusr.com/ugd/be19e1_af7558fe666d4145acb945bb3e98d700.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/levovod/biology_corner_worksheets_analyzing_data.pdfIn PDF document text
    • https://s3.amazonaws.com/gizonukorad/fujinutekikekevimexakegav.pdfIn PDF document text
    • https://s3.amazonaws.com/tibitexil/jigelepijufeze.pdfIn PDF document text
    • https://s3.amazonaws.com/fuwawibu/missouri_deed_of_trust_template.pdfIn PDF document text
    • https://s3.amazonaws.com/jolituzoji/4243659173.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_off0000e71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE71C 5268 bytes
SHA-256: ee394b371353866d9d6afcd01520b91323a5b2ea0268b35c4b03c642d252d127
font_01_sfnt_off0000f927.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF927 12428 bytes
SHA-256: fb38b548a6d1202d434ef3caca7ecd12a1cabdfa4372483ea4a2b4e526f6f56d

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