Malicious PDF — malware analysis report

Static analysis result for SHA-256 893e2dde41788265…

MALICIOUS

PDF

82.9 KB Created: 2021-09-23 22:51:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: e806ba9b8a1d186356571ea460d03fa6 SHA-1: f943c133a6163dc6922a38ad6b1cea2186a70989 SHA-256: 893e2dde41788265c5d5a00495a72fd885e0c4c3c3ea177fb0c29ea794b3877e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs, many of which point to disposable hosting and are used in a link farm pattern, suggesting a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of numerous external links and the overall structure strongly suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://inwebjor.ru/uplcv?utm_term=national+book+week PDF link annotation
    • https://campermagazine.tv/public/file/61005008901.pdfIn PDF document text
    • http://balassalaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/79845395559.pdfIn PDF document text
    • http://grafichesirio.com/userfiles/files/19836210247.pdfIn PDF document text
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/16140d623b4bda---rotosomunonazi.pdfIn PDF document text
    • https://dazzlin.co.uk/wp-content/plugins/super-forms/uploads/php/files/bd0dfb1e07c4ffdae3b341a99a7a89e1/17990125758.pdfIn PDF document text
    • http://oldmotorsclub.com/files/file/13544831780.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/kuwokudirakokedogomoxegi.pdfIn PDF document text
    • http://msslink.ru/userfiles/files/3580990054.pdfIn PDF document text
    • http://ydtmuhendislik.com/ckfinder/userfiles/files/54904137448.pdfIn PDF document text
    • https://riosemarescentrodemergulho.com/ckfinder/files/10481370497.pdfIn PDF document text
    • http://sentai.cc/data/file/20210907_083437_561.pdfIn PDF document text
    • https://www.xyoaa.org/sites/default/files/files/33491071252.pdfIn PDF document text
    • http://podiummoda.ru/userfiles/file/31374469882.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/wesapuxuxolipi.pdfIn PDF document text
    • http://www.cerel.eu/images/wyswig_images/file/moxidizedizakifojudijewap.pdfIn PDF document text
    • http://attep.com/home/sandbox/domains/heekee.com.hk/public_html/ckfinder/userfiles/files/xoroxepediwimekesuvefet.pdfIn PDF document text
    • https://robertbah.si/files/file/gajekebanonapon.pdfIn PDF document text
    • http://jodhpurheritagewalk.com/images/file/kosejuzebiwepanom.pdfIn PDF document text
    • http://smartvoicesys.com/userfiles/64125527201.pdfIn PDF document text
    • http://xinghui.co/upload/ckimg/files/202109131946039403.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/7763381474.pdfIn PDF document text
    • http://pebyte.com/wp-content/plugins/super-forms/uploads/php/files/p44ukuk7u6anflrdel8rj7c4gc/62458493516.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000de75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE75 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f68c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF68C 10128 bytes
SHA-256: 30a0c9dc8f1c9e277218513b730a6a18548acd255a31d286746388a03804fa3d
font_02_sfnt_off00010d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D57 18948 bytes
SHA-256: 9c4612e9541c4d1ccbc77f2d39e8450631d6f75c2bb10d54f48ac4d207cd63f9

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