Malicious PDF — malware analysis report

Static analysis result for SHA-256 b931134114708871…

MALICIOUS

PDF

82.9 KB Created: 2021-04-29 02:03:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 62c13db9fe9ee1c98c270e8e97dde8c1 SHA-1: 71e6637d4996536e7b8065eff82742b7dac9b01a SHA-256: b9311341147088716308b99700873ce175ec17b66c8939199112dd49ab5617c8
186 Risk Score

Malware Insights

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

This PDF file contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. The embedded URLs and the structure of the PDF point towards an attempt to exploit users searching for financial information.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://baarspo.ru/strik?utm_term=what+is+truist+financial PDF link annotation
    • http://zathkatow.xyz/4944914985942zkj.pdfIn PDF document text
    • http://kamikofonem.mygamesonline.org/87807532285.pdfIn PDF document text
    • https://dawifibikinofi.weebly.com/uploads/1/3/4/6/134682228/bb92d2.pdfIn PDF document text
    • http://startask.ru/hp_2013_ultraslim_docking_station_ethernet_not_workingbm1ws.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366018/normal_60570c103c0f6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424328/normal_5ffa94ceebc56.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401732/normal_60640b837223a.pdfIn PDF document text
    • http://lafilubepojev.scienceontheweb.net/what_is_the_whole_armour_of_god_kjv.pdfIn PDF document text
    • http://vienvozvrat.site/144711453323bxvp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449192/normal_606e8f1474554.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392647/normal_6018f4c636d66.pdfIn PDF document text
    • http://firstdoctor.xyz/char-broil_tru-infrared_electric_patio_bistro_240_grill_-_graphitelgkpx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495526/normal_6067951735ccc.pdfIn PDF document text
    • http://biweekamnf.com/mackie_402vlz4_vs_yamaha_mg06ti0f9.pdfIn PDF document text
    • https://pazixexawa.weebly.com/uploads/1/3/1/4/131437352/likagupufitob.pdfIn PDF document text
    • https://naziwimirup.weebly.com/uploads/1/3/4/3/134371197/a4a71acb74f4df.pdfIn PDF document text
    • https://dijuwinepogiw.weebly.com/uploads/1/3/0/7/130738679/315ac4cecf563.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://kuzixejupizago.epizy.com/saxigin.pdfIn PDF document text
    • http://xajezenu.epizy.com/burirabopomokuxakebibud.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_off0000fa8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA8A 4636 bytes
SHA-256: e2242b92d2e0c06231e9e4a5edcee60a69c97e1522de7735de91115901650828
font_01_sfnt_off00010a40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A40 11196 bytes
SHA-256: 2314eabeee768159674287b70af9bd3e2ba4fe63bd8ddd311d7f9e14d5e38800
font_02_sfnt_off00013049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13049 4324 bytes
SHA-256: ce7e2e230a41ba6fc2d7d2240890c8289d67876d84a3d076d67c0b48111c8230

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