Malicious PDF — malware analysis report

Static analysis result for SHA-256 bc5410fa8ac56fea…

MALICIOUS

PDF

76.2 KB Created: 2021-02-27 13:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 13f48771e83c1ae2b964c4ff86c3d5c8 SHA-1: a87395c11c9449eef2ad1f922414d92e5447ffcf SHA-256: bc5410fa8ac56fea11692dd8d3758169aaaa99df4baa8b1ce21ba7b1764979ba
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was identified as malicious by ML classifiers and ClamAV, specifically as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or phishing operation. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to host these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=ejercicios+de+limites+laterales+con+grafica PDF link annotation
    • https://cdn.sqhk.co/vilonunufuk/fhjggVm/58861642098.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385235/normal_6037c84b82359.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4471092/normal_60026e9c5de3d.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/jg5hbed/vodaz.pdfIn PDF document text
    • https://cdn.sqhk.co/vipujitebiki/hajfhdn/94917815810.pdfIn PDF document text
    • https://cdn.sqhk.co/kitujesijak/gfjagFh/battleclaw_season_1_episode_28.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416149/normal_6015ffb2dea17.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369511/normal_60280c2955efe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379856/normal_6010a0c8135b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389797/normal_601da8dd65e88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464083/normal_60381b84057c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470972/normal_5feaeeb20733b.pdfIn PDF document text
    • https://cdn.sqhk.co/vasibejovej/cJge7VW/entergy_texas_online_login.pdfIn PDF document text
    • https://xigolomo.weebly.com/uploads/1/3/4/4/134483438/pipetibuvu-wezed-zesebafikibil-daxejiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497687/normal_6026ade7c3cba.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/jinabom/48471821250.pdfIn PDF document text
    • http://xeroxofebamuwu.rf.gd/63925153508.pdfIn PDF document text
    • http://javisan.epizy.com/12971118717.pdfIn PDF document text
    • https://s3.amazonaws.com/baxunaf/53051888889.pdfIn PDF document text
    • http://petilawunabebi.epizy.com/84353313316.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_off0000db46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB46 5164 bytes
SHA-256: c16742fd3d44834c5347f8384bce34c8be7cf26bc3929a73fe2a1c0d9616ccb9
font_01_sfnt_off0000ecbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECBD 11800 bytes
SHA-256: d4f8757e0e146c19ec20ca813f3aadabd8da320659f26307c7a7c738c428886d
font_02_sfnt_off00011343.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11343 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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