Malicious PDF — malware analysis report

Static analysis result for SHA-256 3597cfd32db26bae…

MALICIOUS

PDF

79.7 KB Created: 2021-09-18 10:17:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 713a7711e334c6c6c1b2324097cb3c96 SHA-1: 68da1e83c5932f45845b0c929ad5499187d4e77f SHA-256: 3597cfd32db26bae4c5b723a4ec33ff20bf7493b915cc14c7d5a628ef835b21b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous external sites, many of which are hosted on disposable domains. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://aftp.bg/userfiles/file/62233279409.pdf
    • http://tropo-design.com/ckfinder/userfiles/files/varakodutamanar.pdf
    • https://tsegypt.com/file/10095962304.pdf
    • https://dintek.eu/uploads/file/zegeroniwedes.pdf
    • https://ev-owners.jp/userfiles/files/4167517205.pdf
    • http://tjjjsh.com/uploads/files/gadojipavebe.pdf
    • http://bachtungcompany.com/upload/files/59557114063.pdf
    • http://sun-green.eu/ckfinder/userfiles/files/wivetarusi.pdf
    • http://fertilityupdates.com/userfiles/files/74281098835.pdf
    • http://www.polni.si/Images/files/tagumusikegozunufufo.pdf
    • http://chafewyuok.handysociality.com/upload/files/52639945691.pdf
    • https://gaziemirkentkonseyi.com/upload/files/vomebiverugunujosim.pdf
    • https://okud-istra.hr/userfiles/file/13320289436.pdf
    • https://associazionebriciole.it/public/file/16499576569.pdf
    • https://mots.alaxarxa.cat/cmsimple/images/file/64560289578.pdf
    • https://sportcity.bg/webroot/img/content/files/78016488724.pdf
    • http://lacasedescaraibes.fr/file/joxexatobafo.pdf
    • https://sensiblemachines.com/ckfinder/core/connector/php/files/bofixesewawafef.pdf
    • https://jingchengs.com/jingchengs/ckfinder/files/20210905184708.pdf
    • https://jmbarrenetxea.soinuenea.eus/files/galeria/files/xuzuwozanubofuginenexax.pdf
    • http://phunphu.com/userfiles/file/zepabuxupimag.pdf
    • https://happyfun.tw/uploads/files/202109071552515555.pdf
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/fakebawaziganunujarefo.pdf
    • http://www.dkmodels.net/ckfinder/userfiles/files/jisitukedilaselab.pdf
    • http://sushigonewildtogo.com/uploads/files/18495989166.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=siri+for+android+apk
    • 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_off0000d49d.bin
6cb05c870fb1bad348b4a203d00884160aa933a8c14dc72705f6706727b1b2dc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD49D 10216 bytes
font_01_sfnt_off0000eb8d.bin
99c7d414486f803081a04fec09e518e1284279ffa9e6568678db40af853062cc		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB8D 17644 bytes
font_02_sfnt_off000118fd.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x118FD 16792 bytes

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