Malicious PDF — malware analysis report

Static analysis result for SHA-256 a819dfac7e0a0137…

MALICIOUS

PDF

82.1 KB Created: 2021-09-18 09:56:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 507dd9c93a6fcaf01a6065d860bad3bb SHA-1: 84dde953436f534b924eb174c9dcd8981a450975 SHA-256: a819dfac7e0a0137b09d04fee9b9ba4965dbeefd2747b042bb17bc5cad58872b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic point towards an attack pattern involving directing users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

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://energyexcess.com/userfiles/file/71386956425.pdf
    • http://mdfgiare.com/upload/files/sinisifopolut.pdf
    • https://bentzendesign.se/wp-content/plugins/formcraft/file-upload/server/content/files/1613f9d88c1828---biwukegajepozojototel.pdf
    • http://cascad-trans.ru/files/lixuneramezotazi.pdf
    • https://loffoxfitness.mvwebsolution.com/userfiles/files/moxunodavibebinebatotas.pdf
    • http://euskararenginkana.eus/files/galeria/files/fodisubaribofamutufi.pdf
    • https://inunekocp.jp/mailmagazine/upload/files/72472410564.pdf
    • http://izumrud38.com/ckfinder/userfiles/files/3724293397.pdf
    • http://dtyxbpzx.com/filespath/files/20210902135452.pdf
    • https://lyonsinn.com/nbloom/fckuploads/file/sotiwozebazarosotajepuza.pdf
    • https://www.bnbtravels.com/ckfinder/userfiles/files/82041887672.pdf
    • http://siciny.eu/userfiles/file/53441663095.pdf
    • http://chothuethietbi.info/img/files/35094686598.pdf
    • http://kgmda.com/upload/files/bemajimudux.pdf
    • http://www.bash.cl/media/file/95389409168.pdf
    • http://studio5r.com/userfiles/files/tixiranapuwo.pdf
    • https://www.ijmsir.com/ckfinder/userfiles/files/jureniz.pdf
    • http://www.radio-kum.si/data/files/forepab.pdf
    • https://stgeorgedentalcare.in/ckfinder/userfiles/files/godipeg.pdf
    • http://chunmianxian.com/upfolder/e/files/20210906161918.pdf
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/31538284700.pdf
    • http://lamarchesainterita.be/lamarchesainterita/imgdb/news/files/fagorapojesewagadojojor.pdf
    • http://n-production.com/upload/fckeditor/file/kowoverexebomog.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=this+app+is+not+available+in+your+country+android+fix
    • 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_off0000da55.bin
7789b8c6930d7d61fed34b5de08ff4c0b58a07af9e7f626d88fbf279c3ca011b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDA55 17704 bytes
font_01_sfnt_off0001088e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1088E 16792 bytes
font_02_sfnt_off000120a5.bin
ccb8ee614a571916f0bc51fc59bb96628840171657f6936de4cae69f0891232b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x120A5 11204 bytes

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