Malicious PDF — malware analysis report

Static analysis result for SHA-256 1684681e2b457a44…

MALICIOUS

PDF

71.0 KB Created: 2021-09-13 08:55:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3)
MD5: 35a59b2207f4a777191452a8840e10a5 SHA-1: d441bfa3da948e30495eefb9b331a96ea64b11fe SHA-256: 1684681e2b457a4433437ed94de57bf43c22b95fb4225619737df4b5c7da4a50
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, with heuristics indicating it's a link farm designed to redirect users. The document body is heavily obfuscated, but the presence of numerous unknown URLs suggests a phishing or malware distribution attempt. The primary attack pattern involves luring users to external sites via a deceptive document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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 https://e-ssuances.com/ckfinder/userfiles/files/24613036325.pdf
    • http://shriadinathbank.com/uploads/57395737920.pdf
    • http://sjccgy.com/userfiles/file/61569851355.pdf
    • http://dochoiotovn.com/uploads/userfiles/file/31098960879.pdf
    • http://longbeach.ilovepokebar.com/uploads/files/kavid.pdf
    • https://tavcam.com/upload/ckfinder/files/30497216330.pdf
    • http://halaljones.com/uploads/files/xudunoparowadudetukujoli.pdf
    • https://kildevangen.dk/files/dimisuxemevugowinadixib.pdf
    • http://bolt-go77.com/fckeditor/userfiles/file/89234179457.pdf
    • http://kajo-frings.de/userfiles/file/90488401553.pdf
    • http://kaies.net/upfiles/file/volewo.pdf
    • http://franceplus.fr/userfiles/file/xukagerizuw.pdf
    • https://hattshopping.com/admin/assets/images/ckfiles/70989774579.pdf
    • http://m2m2design.com/userfiles/3299559100.pdf
    • https://neoville.ru/wp-content/plugins/super-forms/uploads/php/files/6f6f14b65ffd8dbe1b600d91706f8f68/tutasarexikijopix.pdf
    • https://spa-salon.ru/ckfinder/userfiles/files/27864014978.pdf
    • https://www.colline-eternelle.com/ckfinder/userfiles/files/kaxegoridunekemanozibap.pdf
    • https://pasarangroup1.com/contents/files/26338146578.pdf
    • https://bbox.ru/images/shared/file/lodowoxajosewosekojukiju.pdf
    • http://mspchicagolaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zevokozuvevijefevavaz.pdf
    • https://hondamienbac.vn/userfiles/file/fatunesudinosokuruxiri.pdf
    • http://changjiujz.com/uploads/files/202109092116324698.pdf
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=forza+horizon+2+mod+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_off0000b74e.bin
9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB74E 16792 bytes
font_01_sfnt_off0000cf60.bin
8069d3cd41d1273d65237b24667a30bd9064c5defa68f02d16d5ed8243e6e7d9		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF60 15636 bytes
font_02_sfnt_off0000f72f.bin
150f87e42b37c7bef9389bab0ba8fdcaa06248f5e48977bcdd8d45da17e73597		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF72F 10460 bytes

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