Malicious PDF — malware analysis report

Static analysis result for SHA-256 13aeb040c2757939…

MALICIOUS

PDF

78.1 KB Created: 2021-09-19 23:48:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 6337632a5e4ddde03ea99d40c4c910be SHA-1: 6704491223466681bde3bc1ca8708c2d47fa1506 SHA-256: 13aeb040c2757939d0ae114700948bf0393e784f449c0e3febb72f32e0f754e0
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 a large number of embedded URLs pointing to various domains, suggesting a link farm designed to redirect users to potentially harmful sites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a deceptive web presence.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://irlanc.ru/uplcv?utm_term=social+groups+near+me PDF link annotation
    • https://fanaf.com/article_ressources/file/dagoxavolorovigegala.pdfIn PDF document text
    • http://le-nora.com/userfiles/file/semalafavu.pdfIn PDF document text
    • http://karinameal.ru/imgdish/files/56642273175.pdfIn PDF document text
    • http://www.fonfe.com/uploads/files/kexanuf.pdfIn PDF document text
    • http://flynewsletter.com/uploads/file/98959419714.pdfIn PDF document text
    • http://daming-school.com/userfiles/file/6964219619.pdfIn PDF document text
    • https://tanvietnamdinh.com/uploads/files/36609296996.pdfIn PDF document text
    • http://ixtvs.de/_upload_bilder/_filemanager/file/60867100918.pdfIn PDF document text
    • https://embassyinvietnam.com/webroot/img/files/87342855096.pdfIn PDF document text
    • http://pacemakerpressintl.com/uploads/assets/file/gaxasodelowave.pdfIn PDF document text
    • http://foire-fromages-et-vins.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ebd9f8ca5c---55097099876.pdfIn PDF document text
    • http://oryginalnedekoracje.pl/userfiles/file/97326829370.pdfIn PDF document text
    • http://3bbb.fr/ckeditor/upload/files/faromofar.pdfIn PDF document text
    • http://dpsnowodworze.pl/userfiles/file/68262591224.pdfIn PDF document text
    • http://abwsalisbury.com/uploads/files/43874676561.pdfIn PDF document text
    • https://www.multilandtours.com/assets/ckfinder/userfiles/files/rogokofosizazifuwe.pdfIn PDF document text
    • https://vico-immobilien.com/ckfinder/userfiles/files/24071751676.pdfIn PDF document text
    • http://tuvantindat.com/uploads/2021-09-05/images/files/71080289426.pdfIn PDF document text
    • http://fandimnarodaku.cz/upload/file/digezitiragivuxun.pdfIn PDF document text
    • http://vaynhe.com/upload/files/votagumigigug.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/vutafiwejifuguxa.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109111131267406.pdfIn PDF document text
    • http://korytnica.net/data/files/36686939245.pdfIn PDF document text
    • http://2990592.ru/ckfinder/userfiles/files/maxuvekawebolagi.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_off0000cad7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAD7 10796 bytes
SHA-256: 7d68e8c6bde0d1d8c98b3ae3aed0b63756633adec5e3f441859a346cfba44167
font_01_sfnt_off0000e3a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBB6 18164 bytes
SHA-256: 8f64fefe0a225ee5db53f862ee04bfdb1b1a23411baf0a1b0b0dcff8fbdf9e48

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