Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eacf8501540eb6c…

MALICIOUS

PDF

73.2 KB Created: 2021-09-09 07:47:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 2da82d79fbd67f8785ef9f71dace6852 SHA-1: ad5575369bcca47fd63364380771553dc24d46cc SHA-256: 3eacf8501540eb6c38d7ebea0e8313e842e43bf0d0b88398d062a363d3e5748e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, with numerous distinct domains hosting PDF files, suggesting an attempt to distribute malicious content or phish users. The document body is largely unreadable binary data, providing no direct textual lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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://thucphamtruongxanh.com/Upload/files/34293436271.pdf
    • http://instant-image.net/UserFiles/Site/File/rusodikekuperaferi.pdf
    • http://silver.jo/ckfinder/blanc/files/56974745052.pdf
    • http://huyndaicaudien.com/upload/files/toguravuliwuvubabosaxode.pdf
    • http://sumosushingrill.com/uploads/files/67288572550.pdf
    • http://ayrh.internet-match.com/upload/files/54976190952.pdf
    • http://gearonlaw.net/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/27142046899.pdf
    • http://handsonmontessoripk.com/userfiles/files/lozozaledapizopumoniduki.pdf
    • http://kaufdeinauto.de/wp-content/plugins/formcraft/file-upload/server/content/files/16136253da6399---10572890447.pdf
    • https://exam11.menapoint.com/app/webroot/upload/files/54714895298.pdf
    • http://beautifulmoda.com/userfiles/files/45995320958.pdf
    • https://prawobrzeze.info/userfiles/file/xebojovagededarud.pdf
    • http://pentas.eu/userfiles/file/supifek.pdf
    • http://zuche0551.com/upload/file/41656295919.pdf
    • http://24cvety.ru/upload/files/38530200245.pdf
    • http://www.espaciocultivarte.com/ckfinder/userfiles/files/56564950599.pdf
    • http://freetourscadiz.com/ckfinder/userfiles/files/16945581977.pdf
    • http://dental-forum.ru/userfiles/file/fowuj.pdf
    • http://hutnia.pl/userfiles/file/75099208693.pdf
    • http://miskolciharsona.hu/pictures/file/62754764504.pdf
    • http://anhbanglaw.com/userfiles/file/xuninovebigajolijodabe.pdf
    • http://langeline.com/ckeditor/upload/files/datepolume.pdf
    • http://santamariamikado.com/uploads/files/56871399819.pdf
    • http://fitviewer.de/files/file/77870927323.pdf
    • https://rugsdirect4u.com/uploadedfiles/file/9222468884.pdf
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=garbh+sanskar+pdf+file+in+gujarati
    • 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_off0000b99b.bin
6c4a2cce47a3863409b2067975be3812ce00419ef3a743b1c486d745f6b9e623		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB99B 11160 bytes
font_01_sfnt_off0000d32e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD32E 16792 bytes
font_02_sfnt_off0000eb40.bin
8d0561fe5c60fb68b31da75424d67d7ecc4467d0d7f862f8fc67ed49daf9729f		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEB40 16928 bytes

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