Malicious PDF — malware analysis report

Static analysis result for SHA-256 f3b09825fc81b7a0…

MALICIOUS

PDF

67.4 KB Created: 2021-02-17 19:49:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 00ff926a53cfb80595ab0e49aa17e9e0 SHA-1: e450279abdc52e747202c17276f39e4b67bdcbf4 SHA-256: f3b09825fc81b7a0ee40ceaaba79f7bbb5f5165ba7acb156e75020c83e9cfe39
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a spearphishing attachment used to redirect users to malicious content.

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://leonvi.ru/strik?utm_term=a+far+side+collection+last+chapter+and+worse PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467274/normal_5fe7517dd4528.pdfIn PDF document text
    • https://cdn.sqhk.co/tuvameboroke/ohbjc2e/marvel_stadium_seating_view.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407552/normal_601404840a79f.pdfIn PDF document text
    • http://rotarovew.22web.org/jekexuzibuwulig.pdfIn PDF document text
    • https://cdn.sqhk.co/xurazegoba/GhcOnjj/37662156885.pdfIn PDF document text
    • https://cdn.sqhk.co/rabataxuvax/gghhmjf/82616266343.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470979/normal_600e4e64bd062.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370525/normal_5fea0b92d7349.pdfIn PDF document text
    • https://cdn.sqhk.co/baruduwege/Kiihfjb/nicki_minaj_did_it_on_em_instrumental.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://visejatuvun.rf.gd/speakout_advanced_activeteach.pdfIn PDF document text
    • http://kinikodiraxo.rf.gd/mimejepinidutijefelu.pdfIn PDF document text
    • https://s3.amazonaws.com/tawovojo/manutekuledo.pdfIn PDF document text
    • https://s3.amazonaws.com/wapabefizosumi/aldus_pagemaker_software_free.pdfIn PDF document text
    • http://napipipazapuka.epizy.com/dezuxafaxeva.pdfIn PDF document text
    • http://kawisud.rf.gd/ribonifixubamaju.pdfIn PDF document text
    • http://lagadasisipas.rf.gd/30530714673.pdfIn PDF document text
    • http://zalezir.epizy.com/media_player_classic_auto_subtitles.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_off0000c98e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC98E 5324 bytes
SHA-256: b92fd4ce3d02e7c195831f05339cce61211b6bbad44434093778db7c8ae495e2
font_01_sfnt_off0000dbba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBBA 10808 bytes
SHA-256: ebff1ebfe348b826b66d2096d2f4f91e00b49978c10e5e9e79fb07c8369ad673

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