Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba46bfc7c5d2c4f3…

MALICIOUS

PDF

73.7 KB Created: 2021-01-26 20:18:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: b79f0aba094986b75d99d6ff67510cbc SHA-1: b655b2431c0fc9880bb3bff57987272aa054214a SHA-256: ba46bfc7c5d2c4f3b0bcf036124fe602221796506ebd65dc833d09a11044f154
134 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a critical ClamAV detection and an ML classifier. It contains numerous external URIs, with one specifically pointing to 'jacksth.ru' and another to a Weebly-hosted PDF, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports the interpretation that the document is designed to trick the user into clicking a link, likely to download a secondary payload or engage in phishing.

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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=sylacauga+high+school+staff PDF link annotation
    • https://moxiwomalupul.weebly.com/uploads/1/3/4/5/134598527/jagixejisezezuro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450884/normal_5fdc47063195b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4414687/normal_5fc872b899bdf.pdfIn PDF document text
    • https://tekitoloveda.weebly.com/uploads/1/3/1/0/131070611/rirolipesil.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393763/normal_5ff64a86bb4ed.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403262/normal_5fca9faed5dd1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4470839/normal_5ff00ed65c07e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366337/normal_60023e33a2bac.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499972/normal_5fccc9da6841f.pdfIn PDF document text
    • https://lukadivosegiga.weebly.com/uploads/1/3/4/6/134679105/4fac97f7.pdfIn PDF document text
    • https://wolunogejafijut.weebly.com/uploads/1/3/4/6/134649672/muzemokovovujini.pdfIn PDF document text
    • http://lajulufubugo.22web.org/63769129087.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://josisuvo.epizy.com/2010_porsche_cayenne_gts_owners_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/19747585288.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_off0000e062.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE062 5252 bytes
SHA-256: 6d869b898cd561688ec0d5cead06c6565817c059a77b054e43d1dfb0dfd5e99f
font_01_sfnt_off0000f250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF250 11808 bytes
SHA-256: b80e8e51313fe36e786f851c0f255d5c8cee8bcd65e4d06f44d927a7793abeb8

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