Malicious PDF — malware analysis report

Static analysis result for SHA-256 44dc6048589d2619…

MALICIOUS

PDF

81.4 KB Created: 2021-02-26 11:48:08 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 5dabbb5edd2c96adea2bebd087eaf0b0 SHA-1: 19c1a516fa0bd265ebe5621b09411bc214565888 SHA-256: 44dc6048589d26196b5fb47badb1fb986f77258ae86120d8f2990950e7eb3871
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kuzutuzo.ru/strik?utm_term=black+hawk+down+cast+and+real+soldiers PDF link annotation
    • https://kusikulovaledif.weebly.com/uploads/1/3/1/6/131606813/7d5e30.pdfIn PDF document text
    • https://sarowamirubene.weebly.com/uploads/1/3/4/7/134736793/vizidakimozek.pdfIn PDF document text
    • https://cdn.sqhk.co/mujawiru/ghjg3Sn/afterburner_oc_scanner_missing.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392470/normal_5fd7bfaec8ef2.pdfIn PDF document text
    • https://cdn.sqhk.co/vogoxaginoje/geuO6xH/world_war_1_trenches_no_man_s_land.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417145/normal_603889c5bbb3c.pdfIn PDF document text
    • http://originalhallyu.com/d-link_dir-615_admin_username_passwordqepnd.pdfIn PDF document text
    • https://toxofeleziwogiz.weebly.com/uploads/1/3/1/4/131406173/pigefanubalisaxeta.pdfIn PDF document text
    • http://pasetbs.xyz/download_cheat_zombie_diary_2_mod_apkmf2r4.pdfIn PDF document text
    • https://jezuvafu.weebly.com/uploads/1/3/5/3/135348480/d87a66c.pdfIn PDF document text
    • https://cdn.sqhk.co/lowimipofevu/ihJPihg/sandwich_factory_menu_rockford_il.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/jjeicic/snes_emulator_chromebook.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4376611/normal_60372412954d6.pdfIn PDF document text
    • http://waystep.site/lixejigusimitnt77j.pdfIn PDF document text
    • https://goradexajegofip.weebly.com/uploads/1/3/0/8/130874122/kezazofewereke.pdfIn PDF document text
    • https://woloxujujesif.weebly.com/uploads/1/3/4/7/134716607/sutezawivotuwexozex.pdfIn PDF document text
    • http://christmas-gift.ru/367860037882n87u.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://pewitodekemifu.epizy.com/genazen.pdfIn PDF document text
    • http://rekutuvogunavur.rf.gd/casio_baby_g_mens_watches.pdfIn PDF document text
    • http://rozizibuno.epizy.com/19125556853.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0D1 5020 bytes
SHA-256: c305667e1625f5cd705311946823572836287c19e9fa5110278cc7c92a254522
font_01_sfnt_off000101d5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101D5 11832 bytes
SHA-256: 06e826ec144b00efad952200d22408667c29f29f28c6ce93c445e90708622963
font_02_sfnt_off00012a23.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A23 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34