Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43967758cdd1676…

MALICIOUS

PDF

71.9 KB Created: 2021-09-15 19:16:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: ee8ae555d2a45a067e6762540ebea47a SHA-1: 77d680adf9492c5d94e6c28593830894d77300b4 SHA-256: e43967758cdd1676a6a328dcd00cf9d4f942998f2539d627357a9bbe8b8f8db5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, indicating a tactic to obscure the true destination of the links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://cructi.ru/uplcv?utm_term=aplikacija+za+blokiranje+reklama+na+androidu PDF link annotation
    • http://cheers-gifts.com/userfiles/79781093655.pdfIn PDF document text
    • http://ccswcd.com/userfiles/file/tumisowebuma.pdfIn PDF document text
    • https://www.agencesramos.com/ckfinder/userfiles/files/60108752773.pdfIn PDF document text
    • https://vinocastillo.hu/editor_up/fejumevix.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/telurop.pdfIn PDF document text
    • https://baglab.pl/galeria/file/13852986295.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/114kip77160cvu207oq7bqlcmi/34573777710.pdfIn PDF document text
    • http://uspeh-kursk.ru/ckfinder/userfiles/files/tolitodatuseruluxakoj.pdfIn PDF document text
    • http://4darchitecture.org/img/all/bimonutulasefavod.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/74449328236.pdfIn PDF document text
    • https://kiptep.ru/file/pemogogafofinujekupe.pdfIn PDF document text
    • https://emtracing.net/userfiles/file/zoniwezesubawub.pdfIn PDF document text
    • http://logo4you.dk/userfiles/file/37176137970.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/161328e140ceed---korotuka.pdfIn PDF document text
    • https://ecoledesgourmets.com/userfiles/file/dukodoluxulibijolusonugas.pdfIn PDF document text
    • http://urjabatteries.in/userfiles/file/76806960371.pdfIn PDF document text
    • http://vonschickenconcord.com/uploads/files/jatatimu.pdfIn PDF document text
    • http://amsuatrust.org/survey/userfiles/files/rasuxuwa.pdfIn PDF document text
    • http://reylab.com/userfiles/file/pipadawitewojume.pdfIn PDF document text
    • https://hssanesteban.cl/files/xedikevadofudimux.pdfIn PDF document text
    • https://www.passion-rnd.com/upfile/files/2021/09/05/nekesuboxufugewemaranunur.pdfIn PDF document text
    • https://sofahatinh.com/upload/files/vuruwefezefego.pdfIn PDF document text
    • https://mediaget.com/userfiles/files/94900763047.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://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_off0000b5dc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB5DC 16472 bytes
SHA-256: c1a03bcc48ce26e52143cb01f396878df19783d9f137426c576383237d15cea7
font_01_sfnt_off0000df23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF23 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f73a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF73A 10912 bytes
SHA-256: c7e9f16f4faf64a59c799ff2c81178f9018efd91b52e8b18da0135807d09162f

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