Malicious PDF — malware analysis report

Static analysis result for SHA-256 2ad88f583de8dfd6…

MALICIOUS

PDF

77.3 KB Created: 2021-02-27 22:49:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 6816b3bfd7d1814eff9a48ec87415ab1 SHA-1: c00bd6c02767d90fed808cf0b6366a49270b53ab SHA-256: 2ad88f583de8dfd6dbe5cb584f6f724e49d5d589809fdec1a3d43ad10abf06da
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm or SEO manipulation tactic. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution via the linked PDFs. No scripts were extracted, but the structure suggests it may be used to deliver further malicious 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://leonvi.ru/strik?utm_term=rancilio+silvia+e+v5+review PDF link annotation
    • http://everydayy.fun/kidnap_imdb_parents_guidesjb50.pdfIn PDF document text
    • https://cdn.sqhk.co/navififoro/jhiiehg/3267215061.pdfIn PDF document text
    • https://cdn.sqhk.co/dewozoju/jihhhbh/bijozugededixi.pdfIn PDF document text
    • https://zuzilenew.weebly.com/uploads/1/3/4/5/134527977/bobedonabovemipa.pdfIn PDF document text
    • https://cdn.sqhk.co/javukapegami/jggp7Lw/telecharger_internet_speed_meter_lite_pour_pc.pdfIn PDF document text
    • https://mozawexi.weebly.com/uploads/1/3/1/8/131856146/9627588.pdfIn PDF document text
    • http://eurozone.pro/google_chrome_free_for_window_10c46k8.pdfIn PDF document text
    • https://cdn.sqhk.co/guzunilepin/ifGbxgg/70853561282.pdfIn PDF document text
    • https://cdn.sqhk.co/zidulibu/Ynhcphc/17874017736.pdfIn PDF document text
    • http://istlan.space/monday_morning_leadership_cliff_notesxpmyt.pdfIn PDF document text
    • https://tesewipelevifiv.weebly.com/uploads/1/3/3/9/133997178/sivasane-xesep-wenobujenebar.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://mapulikilep.epizy.com/alfresco_community_edition_windows_64_bit.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_off0000f235.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF235 5076 bytes
SHA-256: e39205f843142ff99a787e9a677da5953c0dab6e2559c947cbd90d76a8810c9c
font_01_sfnt_off000103a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103A7 10700 bytes
SHA-256: f416a5efd0ee20c52591dd41c3a390d6f8111ea6bbd4dbcbd05871ff3556da1a

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