Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f0311823c589f8d…

MALICIOUS

PDF

75.0 KB Created: 2021-03-01 23:10:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 7af4ce9c5a2ceae22674891f97b3a2e4 SHA-1: cd7de74f683c87b3a2b02cfdc96b0012259a763b SHA-256: 4f0311823c589f8d4f79d4a08c11f66c59849b6567d4a0b3f54d13b242d233fe
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are flagged as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious 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://lozipotod.ru/award?keyword=erika+pani+historia+minima+de+estados+unidos+pdf PDF link annotation
    • http://monstergym.ru/thoughts_are_things_book1wiv3.pdfIn PDF document text
    • http://forkidsshop.online/69297830629clds9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393188/normal_5fd3368ebc4f9.pdfIn PDF document text
    • http://sell-toclick.online/wanesipodevubozmia4y.pdfIn PDF document text
    • http://ladyso.ru/big_fish_audio_momentum_pop_rock_hitsf7skh.pdfIn PDF document text
    • http://autoupgrade.website/cowboy_hat_shapes_chartnoz2d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485946/normal_5ff78ef16d22e.pdfIn PDF document text
    • http://wegoluxetas.scienceontheweb.net/36244145737.pdfIn PDF document text
    • https://wezuzasiteva.weebly.com/uploads/1/3/1/3/131397996/b2c12c.pdfIn PDF document text
    • http://arthromedshop.xyz/147110110278i8fn.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451945/normal_5fff46a329e12.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383923/normal_600447de10323.pdfIn PDF document text
    • http://imkl-checker.com/bluestacks_windows_8._1_proqgwtm.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497368/normal_600cc7d763b92.pdfIn PDF document text
    • http://www-sfr-fr-monespace.com/algebra_age_problemsm2b28.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/sazixipame/c_programming_language_bangla_tutorial.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/ponoxemivajuxu.pdfIn PDF document text
    • https://s3.amazonaws.com/musoxifuvitalo/92387995821.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://dx.doi.org/10.24201/hm.v67i2.3488In 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_off0000d5af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5AF 5152 bytes
SHA-256: 2762d1426714820d01bc6e5cde83e12788547635b92d147bfc95e4ada37cdd1f
font_01_sfnt_off0000e6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6FA 12064 bytes
SHA-256: 5770ddfd49d98e48aa39211f8a261f39b52dfdae2aa68a114e3ada9b666cccd5
font_02_sfnt_off00010e4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E4A 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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