Malicious PDF — malware analysis report

Static analysis result for SHA-256 b39b97ee1b3d8c86…

MALICIOUS

PDF

95.5 KB Created: 2021-03-24 23:49:35 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 779e0e99056f910beb86d70f06e3e0a1 SHA-1: c9402bedd97a5a085d36045b127345fa8757b0fa SHA-256: b39b97ee1b3d8c869f4e83278cb22aa30aafd9a2a6d3280bcbe866c50a01d0f4
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier. It contains a link farm with numerous external PDF links, including one to 'jumiwimov.ru', suggesting a phishing or SEO manipulation tactic. The document body is heavily obfuscated, but the presence of external links and the heuristic firings indicate a likely attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://jumiwimov.ru/strik?utm_term=tipos+de+grupos+sanguineos+y+compatibilidad PDF link annotation
    • https://cdn.sqhk.co/ninuxoti/gFjhhhg/color_by_number_multiplication_free_halloween.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465145/normal_6019bf7034d1e.pdfIn PDF document text
    • https://cdn.sqhk.co/baresupujar/zhaM0mL/niti_aayog_sustainable_development_goals_agenda_2030.pdfIn PDF document text
    • https://cdn.sqhk.co/telupiza/RQb5GE9/payday_2_stealth_assassin_mod.pdfIn PDF document text
    • https://cdn.sqhk.co/dorejewibiz/ghdC9hc/fapigituxamuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450145/normal_60137d06a9f2f.pdfIn PDF document text
    • https://cdn.sqhk.co/xibidodoko/QMygfwN/kuvafavefanunuwunixoxer.pdfIn PDF document text
    • https://cdn.sqhk.co/norowitidot/HNxhcSw/44482793058.pdfIn PDF document text
    • https://cdn.sqhk.co/nerurepaza/gighjjs/katavukalanewinem.pdfIn PDF document text
    • https://cdn.sqhk.co/viwiratoposu/aW3jbdY/roblox_promo_codes_november_2020_wiki.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e86c6366-0652-46cb-9e1f-5633a133dba9.filesusr.com/ugd/510a18_a90982e866ac406ebad46de0a81b34c3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/metubevozisul/maxiscan_ms300_link_error.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/windows_media_creation_tool_32_bit.pdfIn PDF document text
    • https://bf808793-8b46-4c54-8b11-319763181fa0.filesusr.com/ugd/0d018b_c9ad6f92a2f249cf9f40fc7cdac6d336.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d29b609-f3fe-44a6-a94b-9e214acc4383/how_to_be_a_licensed_minister_in_texas.pdfIn PDF document text
    • https://8dac4d01-2cd1-45d2-8b5f-6005f802adc9.filesusr.com/ugd/1f96ce_49aa01504af2448e849876786f508a49.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ec372f38-07a7-45a0-96fd-8f021ed1e5d9/devipetutasubetezidivedu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0bf606a1-3370-4a84-85bf-d89e672730a6/78460787638.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/448687d6-1686-4298-9bee-60875fce2d68/how_do_i_open_bitmap_files.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ce02eed5-0b6e-4722-b124-cd28d68dc0d7/xakawajotelekuza.pdfIn PDF document text
    • https://626fb5af-1d67-41cb-86ce-204163677ff0.filesusr.com/ugd/9d869b_fedaa36edd5b4b429bbffefbd9f91724.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011a93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A93 4300 bytes
SHA-256: 033aa4f107ac83ea1b8e052260f1c6c55c8329b954a0a1911f6fc9c63399563e
font_01_sfnt_off000129aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AA 5584 bytes
SHA-256: 2078ffac71aa6093810a422da078cc5812fe2a2aecab26a2921762b8f47affce
font_02_sfnt_off00013c95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C95 17228 bytes
SHA-256: b9022fce5ab571c695fc417ddedc241d34f2fd29c5dc7b7d76d25fc9a8fbdd30