Malicious PDF — malware analysis report

Static analysis result for SHA-256 fc90556f005f0d11…

MALICIOUS

PDF

74.5 KB Created: 2021-09-24 18:33:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e258aac92760b657603752731c48d67a SHA-1: 69ff19dab6b0a594b1c5513332126f3fd23ff75e SHA-256: fc90556f005f0d115d56258f5ad8076122894109a38159d155764e098b683908
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm with numerous disposable URLs, suggesting an attempt to redirect users to malicious content. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://backkwang.com/userData/board/file/34525881878.pdf In PDF document text
    • http://www.jesuseslaroca.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613399a4e2a90---jusamuxemulavaguta.pdfIn PDF document text
    • http://abbeloosschinkels.be/userfiles/file/55837356765.pdfIn PDF document text
    • http://roberlo.cz/www/files/file/bojawabobevibur.pdfIn PDF document text
    • https://sopkambing.com/contents/files/47786981608.pdfIn PDF document text
    • http://www.findvoters.com/userfiles/file/12125895325.pdfIn PDF document text
    • https://tvsporedi.si/vsebina/28362063948.pdfIn PDF document text
    • http://sweepinstyle.com/userfiles/file/zizuxidonewodifewot.pdfIn PDF document text
    • https://newcar-rental.com/uploads/files/202109181505165014.pdfIn PDF document text
    • http://www.leesii.com/wp-content/plugins/formcraft/file-upload/server/content/files/16135db65ddf4f---89014958035.pdfIn PDF document text
    • http://auxerretv.com/content/public/file/rujiketebozijokexavogur.pdfIn PDF document text
    • http://yourhandmadeitems.com/userfiles/file/30443960052.pdfIn PDF document text
    • http://ume.civilkozpont.hu/uploads/file/75328547776.pdfIn PDF document text
    • http://burbank.kopanramen.com/uploads/files/nafalutevenoroverut.pdfIn PDF document text
    • http://familiegravesen.dk/ckfinder/userfiles/files/69577422814.pdfIn PDF document text
    • http://bekescsaba.varosom.hu/userfiles/files/46063571357.pdfIn PDF document text
    • http://www.dkmodels.net/ckfinder/userfiles/files/dabaj.pdfIn PDF document text
    • http://exteractif.fr/pictures/2/86537300147.pdfIn PDF document text
    • https://youkuvpn.com/upload/files/82709034287.pdfIn PDF document text
    • https://alternativecarrepair.com/userfiles/file/31284884205.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/wogilufimofosux.pdfIn PDF document text
    • http://winfielddeli.com/ckfinder/userfiles/files/xoduvelavizenewulexu.pdfIn PDF document text
    • http://hotelniagararimini.eu/userfiles/files/5705297548.pdfIn PDF document text
    • https://skyzoan.com/cake/beta/userfiles/file/widemakinibafafagepuf.pdfIn PDF document text
    • http://basyapiemlak.com/yukleme_klasoru/userfiles/file/87526005243.pdfIn PDF document text
    • http://mgtuae.com/uploads/file/titunobafusekofedasafix.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/YTWXjIUwRh0/uplcv?utm_term=daughter+of+time+pdfPDF 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_off0000be71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBE71 10728 bytes
SHA-256: 591c3c9fc0a4be74048be8697e61f693384df79bc2588d11d4f633e110be9e01
font_01_sfnt_off0000d6da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6DA 17808 bytes
SHA-256: 22255d4ad23506ed1c53742e21ae6d98597c823890d47ae22c1569525da9dadf
font_02_sfnt_off00010438.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10438 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1