Malicious PDF — malware analysis report

Static analysis result for SHA-256 194c37148960bee8…

MALICIOUS

PDF

69.9 KB Created: 2021-04-03 07:14:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 655c8edd61cd8aa6930bc8f543c757e0 SHA-1: 9877094bcccbcd524d94417b59252b8266d11b53 SHA-256: 194c37148960bee8d67470b20db4f096eb9d5089e07d03a9cfad3b5691ee84e7
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs pointing to a link farm, suggesting a phishing or SEO manipulation scheme. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document as a link farm on disposable hosting, reinforcing the malicious nature of the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=ideal+gas+law+and+stoichiometry+worksheet+chapter+11 PDF link annotation
    • https://cdn.sqhk.co/ruzaxube/JG1iaif/65451568424.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/gijWljd/58632121859.pdfIn PDF document text
    • https://cdn.sqhk.co/zidodovare/fjgEQhj/game_of_war_fire_age_movie_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470391/normal_6042c9c2513d6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4367645/normal_5ffc723921591.pdfIn PDF document text
    • https://cdn.sqhk.co/rubogomuweme/9icNZ6O/5881417727.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473359/normal_5fd13056e0459.pdfIn PDF document text
    • https://cdn.sqhk.co/paxajirawegu/ljigfjd/38235568004.pdfIn PDF document text
    • https://cdn.sqhk.co/samanugutu/dKvBSjf/godonetoj.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445726/normal_6060457547f1d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368487/normal_5fe819cb1c62a.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/MhgEhgb/vukemukuvipodaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4484383/normal_60476e3427181.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393790/normal_600032856139f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4503214/normal_5fd044549c834.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465151/normal_5fd61ff301136.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/edfb0267-3eb6-4ec6-932f-e6ec3944ab76/books_after_anna_todd.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad112e9e-5fac-41a5-852a-07c6f21e86bc/dell_optiplex_9010_drivers.pdfIn PDF document text
    • https://bf6af823-cb0d-4ee8-9d5b-4f0b1de5ed24.filesusr.com/ugd/9eb187_6c3d01b738064c68a1153d8e7202bc48.pdf?index=trueIn PDF document text
    • https://6d8b2927-5c4d-40df-b593-c6bd35e19528.filesusr.com/ugd/1adac8_7b0f0e662f1444ff8429416ed0fb18b9.pdf?index=trueIn PDF document text
    • https://8eefcaf3-52f5-4123-8be5-b1f0aaeea45e.filesusr.com/ugd/1d3654_93c3d65c54494e979692d3e553d1a8b8.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/195ea786-1223-4470-9520-c047c162dfc0/ziraxofel.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/470d626f-48c5-4f2b-a847-b6746d444bda/sevevewibixim.pdfIn PDF document text
    • https://b23183eb-b2e5-455e-bc25-91fac1efd10f.filesusr.com/ugd/cc14e4_c2dbc51c56b448c8add97a307f0ede45.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/40b70388-5226-479d-bcb4-920aeb249c32/gokorekabe.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_off0000cfb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFB3 5736 bytes
SHA-256: 7faa390ee28ea8ea033d27e877bce9185ef423e63425478126396b68217a5945
font_01_sfnt_off0000e32f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE32F 10736 bytes
SHA-256: 3f8af6084a8eefc4c777dec211f9f42b9721041835d41bd2e51c46dbf282e4b8