Malicious PDF — malware analysis report

Static analysis result for SHA-256 739d0ce8ec877a36…

MALICIOUS

PDF

79.9 KB Created: 2021-09-20 01:29:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b5b1bcc1e1acdf9be4368aca6f6c6be2 SHA-1: aa743646276e322460a2604d4e583c5b843d1c88 SHA-256: 739d0ce8ec877a36be91c59b84ae391fc50fb02b3ecdf84ccbe0c670ee24e910
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs that point to a link farm, suggesting a phishing or malware distribution attempt. The PDF structure and embedded links are indicative of a tactic to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://tt-ural.su/admin/ckfinder/userfiles/files/tizejudakot.pdf In PDF document text
    • https://newdesert.pl/userfiles/file/51717342333.pdfIn PDF document text
    • http://www.brickchamber.com/ckfinder/userfiles/files/xenesax.pdfIn PDF document text
    • https://bf-pomosch.ru/wp-content/plugins/super-forms/uploads/php/files/fr5r5k0bo8rka2eloikk6da9f7/tulamexonovupego.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/44182726174.pdfIn PDF document text
    • https://sealskinz.ru/files/file/2081110556.pdfIn PDF document text
    • http://daindnc.com/fckeditor/userfiles/file/ruzegosumakegum.pdfIn PDF document text
    • http://vucert.vn/uploads/files/59733536513.pdfIn PDF document text
    • https://knurussian.kr/DATA/upload/files/202109050009121364.pdfIn PDF document text
    • http://nacyc.jp/Upload/file/semuxobosugeragi.pdfIn PDF document text
    • http://studioguidobarbieri.it/userfiles/files/pilibefekotedimisudufofi.pdfIn PDF document text
    • http://emilybarnes.com/DEVELOPMENT/VERSIONED/emilybarnes/trunk/sites/default/files/file/35353581970.pdfIn PDF document text
    • http://bebsulmare.com/userfiles/files/59699911857.pdfIn PDF document text
    • https://careerexpo.alljobsinliberia.com/ckfinder/userfiles/files/xukej.pdfIn PDF document text
    • http://2m-m.eu/userfiles/files/pedorubafepej.pdfIn PDF document text
    • https://rumahbaruku.com/contents/files/pexugifekes.pdfIn PDF document text
    • http://travelci.ru/ckfinder/userfiles/files/wozamu.pdfIn PDF document text
    • https://scavilecis.it/userfiles/file/bewojomekelalij.pdfIn PDF document text
    • https://ifacemount.com/wp-content/plugins/super-forms/uploads/php/files/tvd2rc41rg0vfgt2g929b6qbg7/melubelovedemilalemases.pdfIn PDF document text
    • http://weddingdove.tw/uploads/files/202109081253086749.pdfIn PDF document text
    • https://clubsecurite.fr/webroot/upload/files/97769781089.pdfIn PDF document text
    • https://nnt52.ru/userfiles/file/pumomemo.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=define+disaster+management+cyclePDF link annotation
    • 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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49C 17244 bytes
SHA-256: 9e575128dd058ad3248bbdc01e5463587cb9ae06c9f4d0f816ceb71ae8618e2c
font_01_sfnt_off00010124.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10124 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001193b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1193B 10812 bytes
SHA-256: 1996d24ebd2ec0f45cd1f3c8b7e1e2a00614830456f751bc447f0861413f2f81

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