Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a972d0fcc03aed…

MALICIOUS

PDF

72.2 KB Created: 2021-03-18 03:03:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 42ab3e49e0404a7a55910b879af4e7d2 SHA-1: 21542bd4b93b2eb8200e42b3e281eddc3e0f973d SHA-256: d8a972d0fcc03aedf8858a74b1bad11dabac78906653253e301df2353a15c6df
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO spamming operation. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristics point towards a malicious document designed to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/award?keyword=rassembler+plusieurs+documents+pdf+en+un+seul PDF link annotation
    • http://tezijexipilimo.getenjoyment.net/wuzokamomapubavu.pdfIn PDF document text
    • http://tryici.xyz/drums_of_autumnm6bmd.pdfIn PDF document text
    • https://nuzivepumug.weebly.com/uploads/1/3/1/3/131379706/64c494b45fdacac.pdfIn PDF document text
    • http://com-signto2.xyz/cujo_stephen_king7zq38.pdfIn PDF document text
    • http://hurleyshamburgers.com/libro_de_matematicas_financieras_de_hector_manuel_vidaurriw53zs.pdfIn PDF document text
    • https://mitivowa.weebly.com/uploads/1/3/1/6/131607237/vezetilusixadipafamu.pdfIn PDF document text
    • https://puzagoliwosur.weebly.com/uploads/1/3/4/4/134462366/gekovep.pdfIn PDF document text
    • http://kushtanash.ru/nolurokulekojidamum3693p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://xiwagopa.epizy.com/excel_2010_bedingte_formatierung_3_farben_skala.pdfIn PDF document text
    • https://91ca87c2-c493-4616-adaa-fbcec45394e1.filesusr.com/ugd/6116da_1450945b59074671858525204e87f631.pdf?index=trueIn PDF document text
    • https://c1cb471f-fc5c-4ef2-b3e1-4d0d0d09d135.filesusr.com/ugd/cc5b41_151e19b4e84247a593b7deb42cbc3f0f.pdf?index=trueIn PDF document text
    • https://4bc473c2-84d0-4913-8b4e-281bf44fba2e.filesusr.com/ugd/a25dbd_dc8720670e6744a3b4481edbdf1b0000.pdf?index=trueIn PDF document text
    • https://510b81f6-be4e-4e40-9acf-3f60af495837.filesusr.com/ugd/5f226b_ed5be623f8f04df98fe6ac39c5ca330f.pdf?index=trueIn PDF document text
    • http://pekoguwomigurup.epizy.com/wave_motion_book.pdfIn PDF document text
    • https://35479656-6a94-44d6-ac55-da507c14a2ae.filesusr.com/ugd/d68318_87ec810c64424771a05243a6bc4bb1b3.pdf?index=trueIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_58d5a8261b644e579582bcba4301c5ea.pdf?index=trueIn PDF document text
    • https://61249681-e2d1-4375-841a-b3723294d79c.filesusr.com/ugd/3d514e_8cb8ba2362b549f4948de1538a8d05c3.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d9db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9DB 5448 bytes
SHA-256: 500fac857316cba38ce68aa13d64d3587bd08cba162fd718b384fe506066d774
font_01_sfnt_off0000ec48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC48 11852 bytes
SHA-256: 3d14501290fc06b3a603227f087f9b5b0a0825eb95b6380e41a009e7e1174a94

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