Malicious PDF — malware analysis report

Static analysis result for SHA-256 3931ac58c6bb3dee…

MALICIOUS

PDF

77.5 KB Created: 2021-03-01 18:44:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: e61e0ebd8ae4ba034649c0e2ab7b5eca SHA-1: 1105d8292a1f061d0fff2c39abcc05d5fd3fa866 SHA-256: 3931ac58c6bb3dee6f99ccd11dbff440c34c1ed6167319098d40fdce462fa294
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of external URIs and the link farm heuristic suggest the primary goal is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://maypoin.ru/aws?utm_term=dell+optiplex+7010+-+intel+i5-3570+sff-8gb-500+hdd PDF link annotation
    • https://cdn.sqhk.co/remimidotomi/ibqwc70/hard_riddles_with_hidden_answers.pdfIn PDF document text
    • https://cdn.sqhk.co/wapadofiwe/giemlpE/gwent_deck_builder_tutorial.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465545/normal_600b0f68d4dda.pdfIn PDF document text
    • http://osummer.space/28243987897miz6p.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4468837/normal_5fe22314bbb64.pdfIn PDF document text
    • https://cdn.sqhk.co/linidivez/idiegjk/shelter_island_ferry_map.pdfIn PDF document text
    • http://bufo.online/oedipus_rex_analysisb847o.pdfIn PDF document text
    • https://cdn.sqhk.co/balaragu/ahd2jeR/nimevamu.pdfIn PDF document text
    • http://leaninrzpd.site/network_security_engineer_salary_canadarztjl.pdfIn PDF document text
    • https://cdn.sqhk.co/jujadiziga/mhdXzcI/infective_endocarditis_diagnosis_and_treatment.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4419836/normal_5fe4d2be55037.pdfIn PDF document text
    • https://cdn.sqhk.co/bomemenun/jcfA1ij/62540205480.pdfIn PDF document text
    • https://cdn.sqhk.co/sowotewope/vhe6Ykl/renaissance_history_channel_video.pdfIn PDF document text
    • http://nowtorrentz.com/whatsapp_for_macbook_air_laptopffobj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajozikudesurek.epizy.com/2010_chevrolet_malibu_transmission_problems.pdfIn PDF document text
    • http://mimubokufalow.rf.gd/finding_solution_set_of_quadratic_equation.pdfIn PDF document text
    • http://jarewixefokoxem.epizy.com/wenoxabogepidi.pdfIn PDF document text
    • http://supabije.rf.gd/30xa1202_carrier_chiller_manual.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_off0000ecf3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECF3 5992 bytes
SHA-256: 7d31d8c34acbfcd24eb1d6fd821076cd6a10aee435ad8d1527fbef99c7cb1277
font_01_sfnt_off00010175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10175 11848 bytes
SHA-256: 26e40e6e93bef501a0fb2d3b6587ef16c2106b4c0758a63930003d714d476dcb

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