Malicious PDF — malware analysis report

Static analysis result for SHA-256 904885e4b23a9f38…

MALICIOUS

PDF

85.5 KB Created: 2021-04-02 15:06:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: eb17516329074836c81b815bf480f2a6 SHA-1: d6f53926ae924dcf09d2106a8841926742ffbf41 SHA-256: 904885e4b23a9f3819fe8dc64adf779d2b0cdc0a6f47451896798da645e68d9d
96 Risk Score

Malware Insights

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

The PDF file contains an embedded URL that directs users to a suspicious domain, likely for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent. The document body, though heavily obfuscated, contains keywords related to reports and the wkhtmltopdf application, suggesting a lure to disguise the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://vilenefex.ru/award?keyword=meaning+of+report+writing+pdf
    • http://bezprovodov.guru/kaxesoda473wh.pdf
    • http://kkkirrreeee.space/contabilidad_y_costos_definicion_segun_autoreszuc6h.pdf
    • https://vukosigubew.weebly.com/uploads/1/3/4/8/134860762/tifujalojotasu.pdf
    • http://carluxepaint.site/linksys_ea6500_repeater_modeielvp.pdf
    • http://newser.site/14800642767dzd0x.pdf
    • http://bodyita.space/why_is_my_wireless_charger_not_charging4kk9q.pdf
    • https://sizelelam.weebly.com/uploads/1/3/4/8/134867910/kixuferufinepun.pdf
    • http://labiosdewonda.com/zadaweboktiylj.pdf
    • https://fowemofuf.weebly.com/uploads/1/3/1/3/131379389/ginuwej.pdf
    • https://tatosexu.weebly.com/uploads/1/3/0/9/130969313/sakorurejevefe.pdf
    • https://lirebuzufosol.weebly.com/uploads/1/3/1/4/131453665/7107803.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/367181e7-8035-44af-b9b9-d8e5269b626e/54879859347.pdf
    • https://s3.amazonaws.com/jizubisetebof/asking_for_directions_esl.pdf
    • https://uploads.strikinglycdn.com/files/39128cb6-0d93-46b2-a396-9fcd5f9fb3a9/voxuwuvogipotejora.pdf
    • https://uploads.strikinglycdn.com/files/a7b73aaa-ee1a-41da-b76d-271aced998e0/how_do_you_fix_a_garbage_disposal_that_is_leaking_from_the_bottom.pdf
    • https://s3.amazonaws.com/wovisak/43903899981.pdf
    • https://s3.amazonaws.com/bezutu/zowikojanulu.pdf
    • https://s3.amazonaws.com/dalava/minn_kota_ultrex_80.pdf
    • https://uploads.strikinglycdn.com/files/1b9dc8b6-d113-414d-92a6-7489133217b8/letagapajomelipi.pdf
    • 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://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011009.bin
9f0f253cc0645238163f37c594b006a5699673d9449919b844a7a31f95bd0fcf
pdf-font-stream PDF embedded font (sfnt) at offset 0x11009 5096 bytes
font_01_sfnt_off00012195.bin
eeea1f26fe5dacb64687137f94ea145ddeefc2ba197eaf96dbecad811bd0973c
pdf-font-stream PDF embedded font (sfnt) at offset 0x12195 11072 bytes