Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6609df28a14e84a…

MALICIOUS

PDF

73.3 KB Created: 2021-06-09 11:27:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: 1da52291f333067a0c55d77efd207ba3 SHA-1: 4adeffd6a8a7ba41c9925c811cab7e2fe94ea72a SHA-256: f6609df28a14e84a84336168d9ad3411564427c1a783c4f61dd2a77b396f12fd
194 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document exhibits characteristics of a phishing lure, specifically using an invoice or payment theme to entice users. It contains a significant number of external links, forming a link farm, with one prominent URL being https://queure.ru/pbw?utm_term=express+invoice+7.25+registration+code. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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://queure.ru/pbw?utm_term=express+invoice+7.25+registration+code PDF link annotation
    • https://povoligijiz.weebly.com/uploads/1/3/4/6/134665243/laxosozuwij.pdfIn PDF document text
    • https://bipalokepug.weebly.com/uploads/1/3/4/4/134492575/pozajejipasokapabogu.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4368975/normal_5ff36f14d1b49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378619/normal_5fdbd4e15b818.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403117/normal_6068a393d4ee6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4447087/normal_5fcab7ede9235.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426699/normal_5fdf1c87c9863.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493589/normal_60bca17d5c21e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495681/normal_5ff4db4360ea9.pdfIn PDF document text
    • https://liziruji.weebly.com/uploads/1/3/4/3/134380663/xeniwak.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vatojorisa.pbworks.com/f/modern_combat_4_java_game_cheat_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e5fd01e4-10dd-424d-817c-ac9339f28320/larson_ap_calculus_textbook_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bdf166ba-22ab-453f-adca-fd6c637310ab/music_notes_names_and_symbols_guitar.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ded000b-2b06-4ba6-89cb-2b07ce941ef1/5.pdfIn PDF document text
    • http://ditidema.pbworks.com/w/file/fetch/144905484/report_card_comments_for_weak_students.pdfIn PDF document text
    • http://sazupamufode.pbworks.com/f/60540190330.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/119967b8-0e85-45b3-bcfe-119b19c57818/percy_jackson_graphic_novel_book_5.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddea4935-5936-4568-b6ff-505d19200f45/matujumidetepa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65fbfcac-7125-41c9-a7b8-507011d41499/migalitizulegesel.pdfIn PDF document text
    • http://muzupusap.pbworks.com/f/94827801362.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_off0000db60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB60 5660 bytes
SHA-256: 9b2ca12eb8aba403599d7ec3defcccbe2c8416fd3ab5ce6365baf2f4484ab425
font_01_sfnt_off0000eed1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEED1 12860 bytes
SHA-256: 85edfda7edab9dc78f722ac3b0d8765964c067a6a04750218078c026bf80f01a