Malicious PDF — malware analysis report

Static analysis result for SHA-256 f00b51aa3ab280de…

MALICIOUS

PDF

80.9 KB Created: 2021-03-06 15:03:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 15ee889f26edb44a94346c423e407497 SHA-1: 2fb55abfb92254adfc8fb21d1e32c32068e50ed3 SHA-256: f00b51aa3ab280deedb99d1c3821995e82d2b18e82f6729fd0ea3471fab0d9c2
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as a phishing trojan and by an ML classifier, indicating malicious intent. It contains numerous embedded URLs, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically highlights this behavior, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure points to a phishing or malware distribution lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://gimoguvi.ru/strik?utm_term=roomba+980+black+friday+2019 PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4456998/normal_5fcafc83282e0.pdfIn PDF document text
    • http://xekuluw.iblogger.org/xagopevajasokawonu.pdfIn PDF document text
    • http://pigigozoruda.mypressonline.com/26308417435.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446491/normal_602b5f123f56e.pdfIn PDF document text
    • https://cdn.sqhk.co/nitumatemi/hhif1hc/elements_of_art_examples_form.pdfIn PDF document text
    • https://cdn.sqhk.co/pibepufas/igiid2r/89809658237.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404313/normal_5ff832ee106c8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446759/normal_600d8a930c133.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459941/normal_6037df953b7a0.pdfIn PDF document text
    • https://cdn.sqhk.co/vujenibolo/gjcmigh/mma_fighting_clash_mod_apk_1._34.pdfIn PDF document text
    • https://cdn.sqhk.co/toromerepowa/hehbjdk/taretodimex.pdfIn PDF document text
    • http://vakiduweg.mygamesonline.org/xibemibexedebefujati.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://litopuputorer.rf.gd/psychology_symbol_vector_free.pdfIn PDF document text
    • http://rupeguv.epizy.com/10_minutes_belly_fat_workout_video.pdfIn PDF document text
    • http://vixekufu.epizy.com/82319999071.pdfIn PDF document text
    • http://biligisagazo.epizy.com/confidence_treadmill_pink.pdfIn PDF document text
    • http://xikepidefam.epizy.com/virarufa.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/xoranupudezodelupaliliwas.pdfIn PDF document text
    • http://polebofoxajiras.rf.gd/immanuel_kant_books_list.pdfIn PDF document text
    • http://fipuxogililego.epizy.com/86525146082.pdfIn PDF document text
    • http://bozexobasunuz.rf.gd/check_my_starbucks_gift_card_balance.pdfIn PDF document text
    • http://firuwasuwubo.epizy.com/towoxetilirijovimaf.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_off0000fa78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA78 5976 bytes
SHA-256: cf2163cb8ae89244f662bb5ffdce20b0ac37e2580a9c21693361776eeaa17ff8
font_01_sfnt_off00010ec7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EC7 11544 bytes
SHA-256: 24c6fff3cf15321c945b171322ce1c0b6b94d0cc5c3ab3aef00e01036017b191

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