Malicious PDF — malware analysis report

Static analysis result for SHA-256 dfa958a995d449cb…

MALICIOUS

PDF

76.2 KB Created: 2021-03-03 18:51:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 6b6667526eb8851d4739c7d25f4de1d2 SHA-1: 9f8f33e21d4cb195f900fc1b40dbcc449251667f SHA-256: dfa958a995d449cb29dba271a0d376fa622c5eed7c2317bb1403bcd18372a3bc
126 Risk Score

Malware Insights

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

The PDF contains numerous links to disposable hosting domains, many of which are associated with phishing or malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to a phishing site disguised as a product deal. No scripts were extracted, but the PDF structure and embedded URLs suggest a phishing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://botokaw.ru/strik?utm_term=cook%2527s+essentials+4+quart+pressure+cooker PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4500674/normal_5fe5c0abbcf01.pdfIn PDF document text
    • https://cdn.sqhk.co/xedufoga/4hgjizZ/97334554776.pdfIn PDF document text
    • http://fashion-deals.xyz/fexatadjqeu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418170/normal_6014868c6f073.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452861/normal_5fcf1601b6150.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://fanirivi.rf.gd/bafinozukapenufive.pdfIn PDF document text
    • http://deketinak.rf.gd/installation_service_report_template.pdfIn PDF document text
    • http://veveliwuw.rf.gd/kakiwuzono.pdfIn PDF document text
    • https://s3.amazonaws.com/purufiz/dec_18_calendar_template.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/gezamipolenapikenatos.pdfIn PDF document text
    • http://zuzitubop.rf.gd/rutitomazafepebiwaj.pdfIn PDF document text
    • http://penabak.epizy.com/15573493919.pdfIn PDF document text
    • http://lugaderova.epizy.com/tevaguliwotebolixibawokew.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/vomefuzukita.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dd65.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD65 5144 bytes
SHA-256: 1c9cb33e86ff68861a7f59e68d4a633000805093481541215c06d7a104a0d306
font_01_sfnt_off0000ef07.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF07 11612 bytes
SHA-256: 66ac59a5486ee9634ab0fefc334d5fffef4743f2bb50c57309c9feb8bbf321fd
font_02_sfnt_off00011578.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11578 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378

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