Malicious PDF — malware analysis report

Static analysis result for SHA-256 f36832e868fa7888…

MALICIOUS

PDF

72.4 KB Created: 2021-02-18 14:17:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 3c13ce195fc470debd5d4f7f66823bf2 SHA-1: 1a651a4d39d63a54d49916f4effada01bf4ebf91 SHA-256: f36832e868fa78883d2814c721e1b07ff84fb766dcad30ae438c8cb908a1a207
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, identified as a link farm. The ClamAV detection and ML classifier strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic confirm the document's purpose is to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://bologen.ru/aws?utm_term=crooked+kingdom+summary+wiki PDF link annotation
    • https://cdn.sqhk.co/xuxovunevo/idDibCZ/tennessee_titans_covid_players_list.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428045/normal_602caf5a227bd.pdfIn PDF document text
    • https://cdn.sqhk.co/gukokefa/ig1Yjdx/tiviganurewonibuduxalugig.pdfIn PDF document text
    • http://musc-media.xyz/41225668733eetdo.pdfIn PDF document text
    • https://sawinabepetejex.weebly.com/uploads/1/3/4/7/134714359/3464538.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426697/normal_600946b1ee0ff.pdfIn PDF document text
    • https://cdn.sqhk.co/zolilobup/ihQhjwS/nova_launcher_apk_prime_5._5._4.pdfIn PDF document text
    • https://nijasofefovo.weebly.com/uploads/1/3/4/7/134719995/botufuwomonosarar.pdfIn PDF document text
    • https://xakijugikirire.weebly.com/uploads/1/3/1/4/131437514/9444765.pdfIn PDF document text
    • https://cdn.sqhk.co/jezuleku/jgdAFEd/zitex.pdfIn PDF document text
    • https://cdn.sqhk.co/naliwanik/ihhfjeL/my_android_app_keeps_crashing.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dudotofuzariw.rf.gd/bogavosen.pdfIn PDF document text
    • http://sivokag.epizy.com/bejowunofewud.pdfIn PDF document text
    • http://livofikozenaduj.rf.gd/mikimukonizuv.pdfIn PDF document text
    • http://fopagozijudiri.epizy.com/47159937441.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_off0000de32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE32 5276 bytes
SHA-256: d59aae425d3358e2cb5f8e1865fa7009c7bfbe5fb97427f119f4c7dbad5b4c83
font_01_sfnt_off0000f023.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF023 10692 bytes
SHA-256: dc346defda158755ef81c68459b632e87b24cd4f45f5c7ead51e32b615d7dad8

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