Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1b89d376a7ea5f8…

MALICIOUS

PDF

78.1 KB Created: 2021-05-11 15:33:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 6d781ab4fbca3a37dd40e1051bf84fb2 SHA-1: bdda32f4384d2720270cb1594524c9bd66696ca3 SHA-256: a1b89d376a7ea5f8f0e546fe92e02f8f5dac7f2539a1f1d60d8c8a37f5fc4606
134 Risk Score

Malware Insights

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

The PDF document contains numerous external links, with one prominent URL suggesting a lure related to a 'falcon bms 4.34 training manual'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. While no scripts were explicitly extracted, the nature of the links and the detection suggest the PDF is designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://botokaw.ru/strik?utm_term=falcon+bms+4.34+training+manual
    • http://roflan.site/61767048632gqiww.pdf
    • https://dajidavibaral.weebly.com/uploads/1/3/4/6/134606929/xeritagev.pdf
    • http://effektzhizni.ru/dobojokulusirekezonuzaqtj04.pdf
    • https://cdn-cms.f-static.net/uploads/4413008/normal_5fd308353cbf2.pdf
    • https://static.s123-cdn-static.com/uploads/4383451/normal_5fc936cad1ddb.pdf
    • https://gopaposoxawa.weebly.com/uploads/1/3/0/7/130740193/zurovitura.pdf
    • http://baltika-trans.com/no_speed_limit_road_germanyk1ozv.pdf
    • https://jotigigej.weebly.com/uploads/1/3/0/7/130739509/375459.pdf
    • http://usejus.club/the_entertainer_pianob3wm9.pdf
    • http://shopee24.site/active_listening_skills_exercisesjaubq.pdf
    • http://trycabinets.xyz/vector_calculus_marsden_solutions1lwj8.pdf
    • https://situnege.weebly.com/uploads/1/3/4/5/134578036/6796578.pdf
    • http://stroymarketmetal.ru/como_dividir_un_circulo_en_partes_iguales_autocadh78ye.pdf
    • http://blacklaser.ru/culottes_patternh23vb.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/mexijegedakol/kanurofuvoberezut.pdf
    • http://magajavopisili.epizy.com/tibadaseri.pdf
    • https://s3.amazonaws.com/sowewazulejewi/gejujaf.pdf
    • http://xitozowofuza.epizy.com/axalta_logo.pdf
    • https://s3.amazonaws.com/mozedijiz/aditya_narayan_image.pdf
    • http://sufekowanak.rf.gd/tamil_movies_2015_bahubali.pdf
    • https://s3.amazonaws.com/satulibaren/88373872049.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f127.bin
2dc605a6e74826e58b5c6ac7856cbb87f6a341074befbab5deb60d63a080c3e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF127 5496 bytes
font_01_sfnt_off000103ce.bin
903f3d3b8019b23080900f51e8c420a4e4860e66fb97a0d37980b048d049be30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x103CE 11644 bytes

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