Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a592c113d8a4a11…

MALICIOUS

PDF

69.9 KB Created: 2021-02-27 02:39:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: f9152693cb9c0a8e0b333d900198adef SHA-1: 95fb62f5cfd6da75de0e6c4d7156c45431827de5 SHA-256: 9a592c113d8a4a110327fc8e2644c2a4c10b7a6aa6e8a91f20a2ca55d8770127
186 Risk Score

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains a significant number of external links, many hosted on disposable domains, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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://vilenefex.ru/strik?utm_term=define+evolutionary+theory+in+government PDF link annotation
    • https://zoseduzarososu.weebly.com/uploads/1/3/2/7/132740870/b134b0e.pdfIn PDF document text
    • https://fazerirusabutef.weebly.com/uploads/1/3/1/3/131381144/movizipavurakuxulim.pdfIn PDF document text
    • http://eurofamily.pro/how_to_pray_for_a_birthday_person1wvhy.pdfIn PDF document text
    • https://wezawelo.weebly.com/uploads/1/3/0/8/130813956/rozeperen.pdfIn PDF document text
    • https://labaveboto.weebly.com/uploads/1/3/4/6/134611097/xuxafobeme.pdfIn PDF document text
    • http://bemixenorekuji.22web.org/dufajenemujijewasufekirow.pdfIn PDF document text
    • https://sefedajexoxoj.weebly.com/uploads/1/3/4/4/134479396/mifugixenag.pdfIn PDF document text
    • https://vajilitoseg.weebly.com/uploads/1/3/1/4/131437648/8e024.pdfIn PDF document text
    • https://podisubegipuvu.weebly.com/uploads/1/3/0/7/130739029/wadolidinekepus.pdfIn PDF document text
    • https://wenojobopowegit.weebly.com/uploads/1/3/4/8/134879608/telikurijijew-filizizew.pdfIn PDF document text
    • https://tasototunone.weebly.com/uploads/1/3/4/7/134755659/pasinajunajanupige.pdfIn PDF document text
    • https://suzeziji.weebly.com/uploads/1/3/0/7/130739492/0860ec.pdfIn PDF document text
    • http://esclub.pro/aircare_ep9_800_filtervklfw.pdfIn PDF document text
    • http://poroda.site/82098467344db5vx.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/tiniruru/20535552088.pdfIn PDF document text
    • http://ludilisi.epizy.com/mame_0.139_roms_zip.pdfIn PDF document text
    • https://s3.amazonaws.com/lupuvogotog/7008137455.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_off0000d5c5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C5 5164 bytes
SHA-256: 9526ffb6593b2852554f89b02005abfddfa4f87ed9071aa2336ddb47ec7c9681
font_01_sfnt_off0000e746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE746 10200 bytes
SHA-256: c23d30696d6ee436e86ce7f61f38f72aa09c035a4efed3f327b7bdd5c29f1d6c

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