Malicious PDF — malware analysis report

Static analysis result for SHA-256 ced0d40ce404cfbb…

MALICIOUS

PDF

72.9 KB Created: 2021-06-06 12:39:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 00591e4c87aeb4741d32e6f3a748a079 SHA-1: 68c930ac223c043cf52ef3d8d2f5039510c16f31 SHA-256: ced0d40ce404cfbb5b9cd77eda7e7c28be5e5b540798f2899a0d4e15df227477
156 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external links, with a specific heuristic identifying a 'PDF SEO LINK FARM' pointing to a large number of PDF files. The primary malicious URL identified is 'https://chcial.ru/pbw?utm_term=resume+de+l%2527oeuvre+la+guerre+de+troie+n%2527aura+pas+lieu', which appears to be the entry point to this link farm. The document body is heavily obfuscated, but the presence of external links suggests a phishing or content distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://chcial.ru/pbw?utm_term=resume+de+l%2527oeuvre+la+guerre+de+troie+n%2527aura+pas+lieu
    • https://xiluruzubu.weebly.com/uploads/1/3/0/8/130813732/xewavesuzusukuv.pdf
    • https://cdn-cms.f-static.net/uploads/4481509/normal_60172be8ad31c.pdf
    • https://cdn-cms.f-static.net/uploads/4477921/normal_600dde2ee3696.pdf
    • https://tivenudonokokom.weebly.com/uploads/1/3/0/9/130969369/luvomitezero.pdf
    • https://jexolelogirif.weebly.com/uploads/1/3/4/9/134901145/a0fc87930a03.pdf
    • https://gebigimudixerez.weebly.com/uploads/1/3/4/3/134374499/5101345.pdf
    • https://gitojigobireko.weebly.com/uploads/1/3/4/5/134517815/8839216.pdf
    • https://labatozun.weebly.com/uploads/1/3/1/6/131607827/piwibotafusavepu.pdf
    • https://kojaresojew.weebly.com/uploads/1/3/4/3/134312518/8214243.pdf
    • https://cdn-cms.f-static.net/uploads/4499651/normal_606eac170834b.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ed1eefcd-f3fd-4123-838a-7e26b6afacb0/the_end_of_the_f_world_soundtrack.pdf
    • http://nikekuva.pbworks.com/w/file/fetch/144426894/jasisusirelujoxofut.pdf
    • https://uploads.strikinglycdn.com/files/ccbe65ce-883a-44ec-b3ad-41d080e5e997/tableau_for_beginners.pdf
    • https://uploads.strikinglycdn.com/files/e99d9eec-792f-46a1-ab35-9f3779845140/probability_and_random_processes_grimmett_solutions.pdf
    • https://uploads.strikinglycdn.com/files/94160e97-f03c-4b59-8774-281eba540d35/14685809903.pdf
    • https://uploads.strikinglycdn.com/files/0c57a05b-a38d-4267-80e7-ec6cbdbb0630/cat_5e_cable_color_code.pdf
    • https://uploads.strikinglycdn.com/files/a3a03c47-9ea8-4d37-8341-a098a6e911cb/nail_salon_business_plan_south_africa.pdf
    • http://tiduxikuve.pbworks.com/w/file/fetch/144421752/malagevaxiforivifozozix.pdf
    • https://uploads.strikinglycdn.com/files/c77e9ab4-b2ef-4d54-810c-ae53de7bd84d/microsoft_2016_crack_kmsauto_lite_portable_test4.rar.pdf
    • http://sonopewobu.pbworks.com/f/jim_raman_cause_of_death.pdf
    • http://gafuxexosaru.pbworks.com/w/file/fetch/144549594/finuzoxagotonok.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_off0000dc7d.bin
c715717a735ff32bef9ba33877829e84e158f51db5cb86d0526a5c6ddfa7b0be		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDC7D 5380 bytes
font_01_sfnt_off0000eec5.bin
9f11a45abd522e96753712774979262adaf8e13a66185d059ad0646459e578ab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEEC5 11740 bytes

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