Malicious PDF — malware analysis report

Static analysis result for SHA-256 928d2ff43813ba65…

MALICIOUS

PDF

68.6 KB Created: 2021-02-06 07:16:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 87aaa60abce8d960a86ff14fb86bfc84 SHA-1: fd244a5e5a342ff6a1490e329d47d09ee45f4ec2 SHA-256: 928d2ff43813ba65ee85a84914fd8bc12784e9183ae567f69ba9447f9fdff495
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains a large number of external links, characteristic of a link farm or SEO manipulation scheme. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful content.

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://jacksth.ru/123?utm_term=thong+bikini+swimsuits PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4476750/normal_600eb1d230a8e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4501054/normal_5fcf5f7d7599d.pdfIn PDF document text
    • https://fupefomaxoxaje.weebly.com/uploads/1/3/4/8/134897629/55d1cc.pdfIn PDF document text
    • https://vobudofokivelux.weebly.com/uploads/1/3/4/5/134599261/8536696.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383574/normal_5fdc26d86e6c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460966/normal_5fd8cb4761493.pdfIn PDF document text
    • https://wedodoto.weebly.com/uploads/1/3/5/9/135993452/1697349.pdfIn PDF document text
    • https://rupogasonewu.weebly.com/uploads/1/3/4/6/134653860/sitinasupudebabamow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454678/normal_601e04526beb9.pdfIn PDF document text
    • http://kikizuzufo.iblogger.org/4th_man_out_imdb_parents_guide.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447095/normal_5ff804515ba1a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401694/normal_5fefed6519110.pdfIn PDF document text
    • https://zuwiwenulabir.weebly.com/uploads/1/3/1/3/131381762/jaxuwe_gatoxodam_desoga_xexesiborus.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zakuvusebaj.epizy.com/bhangra_dhol_song_free.pdfIn PDF document text
    • http://fobegakolu.epizy.com/b._sc.__information_communication_technology_education.pdfIn PDF document text
    • http://timodetunidup.epizy.com/640973514.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_off0000cfbb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCFBB 5004 bytes
SHA-256: c87570c18a667d73cf3a947cac15ad1985c8b2d5896cf4f694616b2032da6bdf
font_01_sfnt_off0000e0bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE0BC 10864 bytes
SHA-256: 75662871fd8689b70382c7e1bba9dcf338fadae7eaf396891a625ecea3d7f460

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