Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba31af3e4fc8294d…

MALICIOUS

PDF

70.6 KB Created: 2021-02-14 13:05:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: 1a41ff4f7ad51e40d499dd0cf1fb1913 SHA-1: b3570041980de5dcbe0b7651de3eb884e039f3d5 SHA-256: ba31af3e4fc8294d28d1f769f7810bdaea531c0a0debf7b886266458658dae63
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to disposable hosting services, indicating a link farm or SEO spamming operation. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution through these linked resources. No scripts were extracted, but the structure and heuristics point to a malicious document designed to redirect users.

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://leonvi.ru/123?utm_term=queen+sleigh+bed+frame+big+lots PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4452385/normal_5fdab985b7694.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427809/normal_6019d678c8424.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4381971/normal_600e6275a404b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4456122/normal_601155d8b894b.pdfIn PDF document text
    • https://waxevinibiwe.weebly.com/uploads/1/3/0/9/130969944/nuveruva.pdfIn PDF document text
    • https://rofosuvobatijam.weebly.com/uploads/1/3/4/6/134661532/4651393.pdfIn PDF document text
    • https://fipuwetula.weebly.com/uploads/1/3/3/9/133997959/1835037.pdfIn PDF document text
    • https://sovopedu.weebly.com/uploads/1/3/5/3/135301682/rotew-ridoxezox-futewoge.pdfIn PDF document text
    • http://tizigigukaj.22web.org/vilniaus_autobusu_stotis_informacija_telefonas.pdfIn PDF document text
    • http://discount50it.pro/downloader_private_browser_apkpure36zjl.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383795/normal_601179d359edc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4423750/normal_60199949991f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454052/normal_60128d2719b01.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
    • https://s3.amazonaws.com/tawovojo/free_chess_books_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/vuliwisuwig/wopewomasategili.pdfIn PDF document text
    • https://s3.amazonaws.com/kasuwevovog/toyota_chr_2017_manual.pdfIn PDF document text
    • http://tizugixe.epizy.com/student_certificate_template_editable.pdfIn PDF document text
    • https://s3.amazonaws.com/mujevubutukoxu/mental_capacity_assessment_form_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/rimejiguvif/xomurir.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_off0000c9a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9A2 5404 bytes
SHA-256: 0d9511359ccad444a4bb4810f3a2ce3e1bdc87ba04ca617edfd3c2f375799d48
font_01_sfnt_off0000dbca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBCA 10404 bytes
SHA-256: cebe6c64a13658cde4e8494268376ecd3bfa6ade45e0893be0d0bdc91de04441
font_02_sfnt_off0000ff38.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF38 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

Open this report in the interactive analyzer, or submit your own file for analysis.