Malicious PDF — malware analysis report

Static analysis result for SHA-256 e2846e8a542a3759…

MALICIOUS

PDF

80.6 KB Created: 2021-10-04 23:35:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: d8d12de1446aaadad8b8c2d4b8afcdb1 SHA-1: 96a958002dacef65ec41a619287535f00cfe5118 SHA-256: e2846e8a542a3759a2bbafed28b1191cab2d3e65771374f83828e308e78c13ec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with several heuristics indicating a link farm designed to obscure malicious destinations. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://cffcommunications.nl/wp-content/plugins/formcraft/file-upload/server/content/files/1/1613ea20d63bfb---44259596511.pdf
    • http://ghalemdi.com/userfiles/file/xesinodotewarasa.pdf
    • https://tworaise.com/userfiles/file/21393835982.pdf
    • http://alibabashipping.com/userfiles/file/86052224646.pdf
    • http://ingmarcofaedi.com/userfiles/files/91100361095.pdf
    • http://dawahcity.com/userfiles/file/mutolera.pdf
    • https://uetty.xyz/js/ckfinder/userfiles/files/7832626596.pdf
    • http://novosib-sport.ru/ckfinder/userfiles/files/ribirumoxoketete.pdf
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/3cd25bd4f22ad28f2947c85a9484d16e/4247478.pdf
    • http://gavinlawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xisenigesutenigi.pdf
    • http://amsuatrust.org/survey/userfiles/files/98138408565.pdf
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/56455477103.pdf
    • http://isleford.com/filespath/files/20211002200225.pdf
    • http://yuha.be/_files/file/59479259529.pdf
    • http://nfc-lampang.com/user_img/files/rojaduvabiselo.pdf
    • https://affordans.com/ckfinder/userfiles/files/27923066171.pdf
    • http://elfobchod.cz/foto/Image/file/15806029383.pdf
    • https://abcelectricalonlineshop.brilliantwebtech.com/userfiles/files/99117118736.pdf
    • https://icicle-mountaineering.ltd.uk/ckfinder/userfiles/files/lagigiwitipita.pdf
    • http://docando.es/js/ckfinder/userfiles/files/26426296080.pdf
    • http://meijialx.com/ckfinder/userfiles/files/zizejadali.pdf
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=how+to+string+a+baitcaster
    • 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_off0000d601.bin
01d762f29a41e558d8a97ecd9eb599db1b2ebe9458b47282fe1fd53fd495441d		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD601 10576 bytes
font_01_sfnt_off0000ee57.bin
753aa2dc8da030f16d484b698257e12eeb0cf18e2c9a90d7f2ae69091b6e3315		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE57 18004 bytes
font_02_sfnt_off00011b89.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B89 16792 bytes

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