Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b783739044bda8a…

MALICIOUS

PDF

84.8 KB Created: 2021-09-14 03:43:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: b9d37a48d0d1c7c2a7d58e98d95e73d0 SHA-1: 1ebe011ccd94dc399c451a44edb7824ecc775b06 SHA-256: 4b783739044bda8a206b0fe7e3e1103f6200a4cf1640c262fce19c35394742c0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to PDF files on various domains, suggesting a link farm or redirection mechanism. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a tactic to obscure the true destination. While no scripts were explicitly extracted, the nature of PDF exploits often involves JavaScript for malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://claudiamelchior.it/images/file/limazawenudumuginibotamuv.pdf
    • https://skywaynepal.com/userfiles/file/77793800421.pdf
    • http://evevoyance.fr/adh/.-/file/xowuvabosagavowil.pdf
    • http://aow.infogestnet.it/ckfinder/userfiles/files/zerofozemiwagotibilupegiw.pdf
    • https://cgeminfos.ma/upload/file/vudevufoj.pdf
    • https://www.unicodesystems.com/wp-content/plugins/super-forms/uploads/php/files/sjak0egv5c98uf8fth8ne8nk00/xusivagunenoxaduf.pdf
    • http://symbioticlifetech.org/attfile/fckimg/file///2021090974645_148584072.pdf
    • https://laatuwhuisweerstralen.nl/upload/file/wugabegatifixevez.pdf
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/21255087372.pdf
    • http://laptopplus.be/app/webroot/files/userfiles/files/rekidabixodejo.pdf
    • http://qzgj.cn/upload/file/4431252521.pdf
    • http://brilspa.ro/userfiles/file///42408376363.pdf
    • http://sziszolg.hu/editor_up/suxunagujomemozumamimoguv.pdf
    • http://www.rupankar.com/fckimages/file/16408829213.pdf
    • http://j1ent.com/userfiles/file/20210910212117.pdf
    • https://www.fecomerciomg.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613cd5290a03a---jatedarexidopemuviw.pdf
    • http://satyavnetworks.com/fck_upload_images/file/25385444520.pdf
    • https://ideylia.fr/uploads/file/sazenuleladugabalo.pdf
    • http://reichspfarrer.sk/file/40678304604.pdf
    • https://onderdurdu.com/upload/ckfinder/files/26774415.pdf
    • http://alfatreyd-mebel.ru/archive/images/file/liwiro.pdf
    • http://babijie.com/upload_fck/file/2021-9-13/20210913232901899985.pdf
    • https://gyn-koe70.de/obrazky/file/zoborobofev.pdf
    • https://wsbe17hongkong.hk/_bin/ckfinder/userfiles/files/64638976924.pdf
    • https://shoppe.everybodyisnotdoingit.org/gift/userfiles/files/majuvarexomozadatut.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BkSY9tpko7c/uplcv?utm_term=best+app+for+screen+mirroring+android+to+pc
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e797.bin
ff49f7111fce31163e81164ef41151ac77eecd869d808318fbe2558ea975dfb7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE797 10968 bytes
font_01_sfnt_off000100e2.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x100E2 16792 bytes
font_02_sfnt_off000118f4.bin
76b342245c67385a542d73191570a0fb8aa5ac4614d30c740a3ff6f6c47fec16		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118F4 17176 bytes

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