Malicious PDF — malware analysis report

Static analysis result for SHA-256 a123f11f32e8b3a5…

MALICIOUS

PDF

82.5 KB Created: 2021-03-19 23:00:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 9feacabd1945a46528969e772ae4554c SHA-1: 73bd03ca0f48aaf185c01744207ec83cbf8cfe53 SHA-256: a123f11f32e8b3a58a0c9c338f14d3e706a56fc3b348b4ad6982c32f0c13834c
126 Risk Score

Malware Insights

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

The PDF file contains multiple embedded URLs, with a prominent one leading to 'fokemale.ru'. Heuristics indicate this PDF is part of a link farm on disposable hosting, suggesting a phishing or malicious redirection attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to deliver a second-stage payload or phish credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://fokemale.ru/strik?utm_term=logitech+x+530+5.1 PDF link annotation
    • http://jujibej.iblogger.org/medicaid_managed_care_enrollment_report_2017.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4496818/normal_60462493c2cb0.pdfIn PDF document text
    • http://ig-soft-team.com/walifitapdrh2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407327/normal_5ffe2ef4510e5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4481271/normal_5fe4578215b74.pdfIn PDF document text
    • http://magicwoolshop.com/guideline_diabetes_mellitus_perkeniefelc.pdfIn PDF document text
    • http://onlinetiser.website/husqvarna_725ex_awd_manual8x48g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474998/normal_5fe7cb7076853.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488349/normal_5fecb0c559f2a.pdfIn PDF document text
    • http://fullpisetc.ru/35900381108a75c9.pdfIn PDF document text
    • http://vinnipoh.fun/fotudejibeloxuziratatowin7qzh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392439/normal_60401bf358d56.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/varolexexus/latogifatovibop.pdfIn PDF document text
    • http://daxipazomodej.epizy.com/wowibin.pdfIn PDF document text
    • http://vofopinalog.epizy.com/lenokekokunoroxuzawel.pdfIn PDF document text
    • http://popupigewomuri.rf.gd/inventory_check_in_check_out_template.pdfIn PDF document text
    • http://xubudexev.epizy.com/39148716600.pdfIn PDF document text
    • https://s3.amazonaws.com/dotivaf/chale_aana_pagalworld._io.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/12906607427.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f3fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3FD 5068 bytes
SHA-256: 403399d3fe0f3733114579427ecde3b1235a81a986e543dc7c31a58ab124ac41
font_01_sfnt_off00010563.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10563 23316 bytes
SHA-256: c30ee8f37415fcc141d4e46a6d9b6f403f9818a66c2b06b423f46e0ccdeea04f

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