Malicious PDF — malware analysis report

Static analysis result for SHA-256 1dde4efbeea865d9…

MALICIOUS

PDF

81.0 KB Created: 2021-09-14 01:57:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: e76f8eccca6bf8d253aff1df0aaaaaa3 SHA-1: ea9564552eef502e3f12f77baa5fb1442c207312 SHA-256: 1dde4efbeea865d92fbbdde7986abc90a4277c654b8dd76c7d87601ca786c41a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 http://otvorene-srdce.sk/userfiles/file/81582328741.pdf In PDF document text
    • https://butzbacher.turnpoint.jo/app/webroot/upload/files/58549223534.pdfIn PDF document text
    • https://sogelec-eng.com/files/ckfinder/files/tafila.pdfIn PDF document text
    • http://drairtools.com/ckfinder/userfiles/files/57790787525.pdfIn PDF document text
    • http://studiobardinisrl.com/userfiles/files/lovapovazowiludazemit.pdfIn PDF document text
    • https://rhdplumbing.com/wp-content/plugins/super-forms/uploads/php/files/4fa56223b78dad6a97758f109e1f3c65/25815101182.pdfIn PDF document text
    • https://ibericadearmerias.com/file/sivane.pdfIn PDF document text
    • http://abbwingslynnhaven.com/uploads/files/mibepebudavep.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/55260005726.pdfIn PDF document text
    • http://schokofontaenen.de/idata/3008082376.pdfIn PDF document text
    • http://electriccityusa.com/images/fck_uploads/file/sevonogexujapikonu.pdfIn PDF document text
    • http://blackivy.pl/userfiles/file/wekulorazazuxibi.pdfIn PDF document text
    • http://rotarybrescello.it/userfiles/files/libelabut.pdfIn PDF document text
    • https://avenirpourtous.fr/wp-content/plugins/formcraft/file-upload/server/content/files/161370ecd4c7f7---dowoj.pdfIn PDF document text
    • http://chinalabware.es/d/files/46687958765.pdfIn PDF document text
    • https://chulintemple.house-well.com/CKEdit/upload/files/xamovasoxago.pdfIn PDF document text
    • http://akiyastyle.com/app/webroot/js/ckfinder/userfiles/files/37582606590.pdfIn PDF document text
    • http://okun.su/upload/file/jawufadozipisopafutaxawa.pdfIn PDF document text
    • https://aldwalia.com/userfiles/files/zunesukinubijisokulaxaji.pdfIn PDF document text
    • https://bucatariizidite.ro/printuri-fi/files/91162233536.pdfIn PDF document text
    • http://cuakeobinhduong.com/upload/files/79114416650.pdfIn PDF document text
    • https://www.ebenisterie-burette.com/ckfinder/userfiles/files/54797269771.pdfIn PDF document text
    • http://flapboxes.custompackageboxes.com/userfiles/files/77121578070.pdfIn PDF document text
    • http://aorganboys.handyfriendship.com/upload/files/fiwunadumivel.pdfIn PDF document text
    • https://roshnaai.com/ckfinder/userfiles/files/tisit.pdfIn PDF document text
    • https://kipass.fr/userfiles/file/gakos.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BkSY9tpko7c/uplcv?utm_term=gta+vice+city+lite+download+androidPDF link annotation
    • 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_off0000db22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB22 16452 bytes
SHA-256: 7ea9d2583055e63e16f355556c147a5c22f6bb3cc094a720020ba6b8f660e271
font_01_sfnt_off00010596.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10596 10500 bytes
SHA-256: c6bdfffb1492e4afc8bcd6d57aa72504e9459dd65e72da791f5c74ca9085d136
font_02_sfnt_off00011db0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1