Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc7941bb4fd9610…

MALICIOUS

PDF

73.8 KB Created: 2021-03-10 21:16:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54b717dc2c6632757b670188e564e570 SHA-1: 2da3fafc0157c79c70ab8fe0b7aaeb3127d3e286 SHA-256: cfc7941bb4fd9610618d78f25693347b8b1eac56d110e9af15640618d9efa8c2
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://ponafet.ru/123?utm_term=fm+bmp+to+pdf+converter+free PDF link annotation
    • http://bagezokazuraw.medianewsonline.com/electrophilic_substitution_reaction_mechanism.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452587/normal_603d3c25d37e9.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/good_night_gorilla_story.pdfIn PDF document text
    • http://fasekafalig.scienceontheweb.net/nec_dt300_change_extension_name.pdfIn PDF document text
    • http://theraisins.pro/494016754952dxet.pdfIn PDF document text
    • http://tesekal.mygamesonline.org/69371127702.pdfIn PDF document text
    • http://aromaita.space/wixizoxujvp0sd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454672/normal_604397f31f3f7.pdfIn PDF document text
    • http://saudiautoinsurance.com/niwoporinigazza9f1.pdfIn PDF document text
    • http://1-bog.ru/nogepaxuxixudenogoh8e7q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409103/normal_5feb3b0234871.pdfIn PDF document text
    • http://gibelineg.sportsontheweb.net/39448204078.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://japamitafixe.myartsonline.com/referncias_bibliogrficas_abnt_2020.pdfIn PDF document text
    • http://gajutar.onlinewebshop.net/what_does_the_story_of_cain_and_abel_teach_us_about_god.pdfIn PDF document text
    • https://4a1cfc67-5981-466d-a13b-75576fe7431f.filesusr.com/ugd/64e449_31db9c181df3489d8b872af9563e1b0c.pdf?index=trueIn PDF document text
    • http://filosoko.onlinewebshop.net/feboboranoxidugexabi.pdfIn PDF document text
    • https://f733e552-90a1-4d1f-83ca-a6b36afcf31c.filesusr.com/ugd/38bf1f_02ff2735d2624cf8870a0c9622376b71.pdf?index=trueIn PDF document text
    • https://98e80eac-0673-4bf9-a3de-4132461903b3.filesusr.com/ugd/1acd69_213a99975f57413f906b6b6f5b399fc3.pdf?index=trueIn 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_off0000e365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE365 5036 bytes
SHA-256: bcba692484560905f23ee5ddd77e222ccf3a625f7a39661a13a91ff760087041
font_01_sfnt_off0000f47d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF47D 11292 bytes
SHA-256: c42c5fcf6b852a39b2f835ce0ec970cab47798aedd270740049a23955dad90d5