Malicious PDF — malware analysis report

Static analysis result for SHA-256 ffcdf5cebfe589c1…

MALICIOUS

PDF

72.9 KB Created: 2021-02-19 18:48:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-29
MD5: 80a37347028bde7d44ada9d95dcba9c0 SHA-1: bde381e651b514ba238ca438d206517f0f09c28e SHA-256: ffcdf5cebfe589c104a688a67a585e32071d16ebbb0fff99ba816ea01c6f8fdf
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9998

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+the+introduction+body+conclusion+of+impact+of+technology+on+politics PDF link annotation
    • https://nosisakapu.weebly.com/uploads/1/3/4/7/134773138/eb59b12b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425224/normal_5fc6ce1bf1a52.pdfIn PDF document text
    • https://tizojutatow.weebly.com/uploads/1/3/1/4/131406606/3a6e11f58e1.pdfIn PDF document text
    • https://bowemubunewoseg.weebly.com/uploads/1/3/0/7/130739536/dunagi-zizibazebumig-nufexi.pdfIn PDF document text
    • https://forakisoja.weebly.com/uploads/1/3/2/7/132740641/pamezewexevaron.pdfIn PDF document text
    • https://gujavaluzosozu.weebly.com/uploads/1/3/4/0/134013303/zagifirer_begub_xomusurejez.pdfIn PDF document text
    • https://supokiroxuleniv.weebly.com/uploads/1/3/1/6/131606692/gobafijuburumoka.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413013/normal_5ff86af55c759.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449600/normal_5fd65bec54231.pdfIn PDF document text
    • https://tuvitewolejuxow.weebly.com/uploads/1/3/4/6/134615754/jodadivex-vadunagasexerug-firajiz.pdfIn PDF document text
    • https://lemusudavigi.weebly.com/uploads/1/3/5/3/135395292/80fd1ead030de.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418565/normal_5ff889c48afbf.pdfIn PDF document text
    • https://poliradu.weebly.com/uploads/1/3/5/9/135991332/04d9ebaccd72563.pdfIn PDF document text
    • https://gavofazipog.weebly.com/uploads/1/3/3/9/133999173/somodizotet.pdfIn PDF document text
    • http://vifijes.22web.org/idsa_guidelines_cryptococcal_meningitis_2010.pdfIn PDF document text
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/f5a4b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wanikokod.epizy.com/29670597920.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_off0000e0b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0B1 5824 bytes
SHA-256: f85f6562d9c229f28f689038343b721051febf74fd5e875195427e7446f45c3a
font_01_sfnt_off0000f468.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF468 9716 bytes
SHA-256: e18d2752580bfd00d67fde9e1818e76f7d39e913f60103c75f2f21a07ae1ecd0

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