Malicious PDF — malware analysis report

Static analysis result for SHA-256 23aeeacf0015d1ff…

MALICIOUS

PDF

76.2 KB Created: 2021-03-22 01:22:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b19f325b85cd38adb4b585b557dceef1 SHA-1: 2c3fa183cfebb6f115abf57838049945eca65648 SHA-256: 23aeeacf0015d1ffe2fe803a3a29c2ad3e37f68e670ced13292c362aad2084d0
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, characteristic of a link farm or phishing attempt, masquerading as a download for a game hack. The presence of a critical heuristic firing for 'PDF_SEO_LINK_FARM' and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://nipisod.ru/wix?keyword=descargar+geometry+dash+world+hack+apk
    • https://soridafufunet.weebly.com/uploads/1/3/5/3/135308698/kepuruxa.pdf
    • https://fiwebafifike.weebly.com/uploads/1/3/4/8/134885554/06a2145.pdf
    • https://vigoxanumevu.weebly.com/uploads/1/3/4/4/134466257/8557886.pdf
    • https://cdn.sqhk.co/jupurutage/hihehi9/rijebiriliwawejerugif.pdf
    • http://lokotahas.ru/wozagi7g6rv.pdf
    • https://cdn.sqhk.co/rajemaramiw/kh5IWgd/govuve.pdf
    • http://pearhaidhr.fun/google_search_for_only_filessyzmj.pdf
    • http://clubstore.info/miwasujalunkdzkh.pdf
    • https://cdn.sqhk.co/kitujesijak/dygeiFF/73441240151.pdf
    • https://cdn.sqhk.co/duvetezoje/arjfjip/xumugibonofimumowirimin.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://2ddc7431-ff91-46e9-9708-195efd6cc195.filesusr.com/ugd/ffe0d3_a94a4b6e22a84c848f2daf55a1a8c21f.pdf?index=true
    • https://s3.amazonaws.com/wiwamoxamo/client_server_version_control_system_examples.pdf
    • https://f8e303d0-f350-43d2-b7c3-f886ef13ec25.filesusr.com/ugd/1bb397_5e9ff598f3af4528bdf01662e3cc5a57.pdf?index=true
    • https://s3.amazonaws.com/tufujifinobiro/12744518886.pdf
    • https://s3.amazonaws.com/wixatax/fanafeboroparat.pdf
    • https://s3.amazonaws.com/kovibu/what_condition_is_associated_with_hyposecretion_of_insulin.pdf
    • https://s3.amazonaws.com/pujirageg/16155155223.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_off0000ebab.bin
7fe6b3cf623f4d573ee412201bb5bcd95dc897e5bc14fc00bd0c30678f52a653
pdf-font-stream PDF embedded font (sfnt) at offset 0xEBAB 5744 bytes
font_01_sfnt_off0000ff2e.bin
000267ffb60154e114fac19fdc914766193478d3bebaed3c43e37193829b843c
pdf-font-stream PDF embedded font (sfnt) at offset 0xFF2E 10812 bytes