Malicious PDF — malware analysis report

Static analysis result for SHA-256 93691416affe44c4…

MALICIOUS

PDF

82.2 KB Created: 2021-05-17 17:47:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e420f5029ef570fb306c4e1bea33f0fa SHA-1: bb4c79a0d5238174de2ecc85456ae461c2ba8aee SHA-256: 93691416affe44c4d0b181bb5905c742e9869ea1edbbe347f6d2c25f30da533f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm for SEO manipulation or to host malicious content. The presence of external URIs suggests an attempt to redirect the user to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://pelibifir.ru/strik?utm_term=heil+furnace+prices PDF link annotation
    • http://acupofjacob.com/vocabulary_building_english_worksheetsrmjd1.pdfIn PDF document text
    • http://spencermcman.us/fovoxisiwugexepwgfq.pdfIn PDF document text
    • https://cdn.sqhk.co/zeliravepuj/qhfhgoS/11952675712.pdfIn PDF document text
    • http://reznitskygallery.com/233040871095i6nq.pdfIn PDF document text
    • https://cdn.sqhk.co/rotogogoji/GqhcmIu/flight_simulator_2020_ps4_controller_not_working.pdfIn PDF document text
    • http://cardioactiveufficiale.site/fizefevaleratulatazijid4g53h.pdfIn PDF document text
    • http://jufumabenosenup.iblogger.org/courtly_airs_and_dances_movement_4.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4389568/normal_600240f21d5ce.pdfIn PDF document text
    • https://cdn.sqhk.co/tawibonikigo/e2bhjTT/50417980453.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476272/normal_60362ceaa9bd2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410015/normal_5fdd20c12c38d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4390081/normal_600b62c66637f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419003/normal_603833044a712.pdfIn PDF document text
    • https://cdn.sqhk.co/naziwixolagu/uyiciUw/42022793573.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452834/normal_600b24528e671.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/fadedosi/american_burger_menu.pdfIn PDF document text
    • https://s3.amazonaws.com/tokatefozude/zosobanisibamonepuwuregap.pdfIn PDF document text
    • http://zisunajupanege.rf.gd/case_studies_in_pharmacy_ethics_2nd_edition.pdfIn PDF document text
    • http://fevafimavot.epizy.com/100_startups_to_watch_2020.pdfIn PDF document text
    • http://jevazebi.epizy.com/developing_crm_strategy.pdfIn PDF document text
    • http://rujosaru.rf.gd/seziviwigunojos.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_off00010396.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10396 4968 bytes
SHA-256: 8eb004bb7f964d68762785da5b4cf30565827d6221963ebb30e25c670dd0a435
font_01_sfnt_off00011489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11489 11400 bytes
SHA-256: 3e4115c0fc64c87aa94e7dc48772e0e1247c3142d9e09f71ebebbfdb0d95e6ec

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