Malicious PDF — malware analysis report

Static analysis result for SHA-256 92268a094ee6840c…

MALICIOUS

PDF

73.7 KB Created: 2021-02-08 12:44:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: b065d80459e5e5bc7d53a412e6a84c79 SHA-1: a4150f8066692837f00759222a9951e35208b792 SHA-256: 92268a094ee6840c3b00a06f95b92df6f10f3543abf5605ea62a2ca3652d15eb
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to disposable domains, identified as a link farm by heuristics. ClamAV and an ML classifier flagged this PDF as malicious, specifically as a phishing trojan. The presence of embedded URLs suggests an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • 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/wb?keyword=states%20of%20matter%20quiz%20pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4415326/normal_5ff31701e50ba.pdfIn PDF document text
    • http://pixelbarista.com/el_estandarte_de_urjldf6.pdfIn PDF document text
    • http://lynciguest.com/dudefumschii.pdfIn PDF document text
    • http://org-fruit.space/116616763125so2h.pdfIn PDF document text
    • http://fsfsfd.xyz/pipeff95rt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478951/normal_601d6cc2d33d8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4471455/normal_5fe74b35c78f9.pdfIn PDF document text
    • https://lifoluzasodani.weebly.com/uploads/1/3/1/4/131437418/renepizuroxuj_kanukusigivokap_detodadufudis.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464700/normal_5fddcfb228ccf.pdfIn PDF document text
    • http://bosnoslovnoejelaniekupit.xyz/properties_of_squares_and_rectanglesddczh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4488574/normal_5ffa36d94f4f4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://tobizexajivuvob.epizy.com/14850119852.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_off0000e22a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE22A 5432 bytes
SHA-256: 06680ad24f9a970a6baa7e585c25004a67680f587d71dcc15b055dcb0562c644
font_01_sfnt_off0000f492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF492 10648 bytes
SHA-256: 521d2352e4e7fac5408faa15ac21454c9a859affe028bd9774144530819485a2

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