Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ea976718c1051a1…

MALICIOUS

PDF

69.9 KB Created: 2020-12-29 12:34:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: a4791672ac35b462e139f04817b8efed SHA-1: 23e9163f4c60d2f29e2a910d86c44de6904838fd SHA-256: 2ea976718c1051a1ff06ee3d75a464e4100daa0c151196d9229705d4512db07b
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, many pointing to other PDF files hosted on disposable or suspicious domains. This behavior is indicative of a link farm, often used for SEO manipulation or to distribute malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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 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://traffine.ru/strik?utm_term=restaurant+story+neighbors+2020 PDF link annotation
    • https://ropababiw.weebly.com/uploads/1/3/4/6/134667017/bexojojel.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393908/normal_5f9358e60d6c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4455390/normal_5fafe659159d7.pdfIn PDF document text
    • https://sowikidorazeku.weebly.com/uploads/1/3/5/3/135306740/mutibe_vafuxafijidi_wapes.pdfIn PDF document text
    • https://jufukakoxojopop.weebly.com/uploads/1/3/4/3/134317893/7594659.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f87031b236ed.pdfIn PDF document text
    • https://cdn.sqhk.co/sozovifena/cjcChbV/us_police_monster_truck_robot_mod_apk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450043/normal_5fdb6e0ad8693.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/iar3ihc/bored_button_games_emoji_quiz.pdfIn PDF document text
    • https://rikisuluwujufa.weebly.com/uploads/1/3/1/4/131452938/metugewajubadesutetu.pdfIn PDF document text
    • https://mufedagejex.weebly.com/uploads/1/3/4/7/134726032/43a349bf4de6ea5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/32007695-c9c3-4e85-80e1-9de01915bf97/vovinexewepalexisimijeje.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/college_application_form_2020.pdfIn PDF document text
    • https://s3.amazonaws.com/verirejon/witch_cackle_sound_effect_free.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_off0000d371.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD371 5436 bytes
SHA-256: 11b64ee5c3d0e26bbe9ab9d965547ef1ae84c3fd993e01b3a71c01fdff678a01
font_01_sfnt_off0000e5f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5F5 11080 bytes
SHA-256: c3569fd62bc90544a941048f57f55517a17a6bed3f97fe2f69b7a564900beb2a

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