Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d3c874006df891f…

MALICIOUS

PDF

75.9 KB Created: 2021-03-03 01:40:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: df0ddb8a42d96c35b8b676139fb9a809 SHA-1: d954148b3f78efbd391c05a65e849de3fa015b4a SHA-256: 6d3c874006df891fdc0f878e2407a883c0d2020216d1d2b44ba34bbd9fa3fc83
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by heuristics as a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed 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://pelibifir.ru/strik?utm_term=alpine+mrp+m500+amplifier PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4416504/normal_5feb0e41282b6.pdfIn PDF document text
    • http://wanasuj.22web.org/number_format_javascript_jquery.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490754/normal_5fe11f59b3474.pdfIn PDF document text
    • http://timogefubor.22web.org/59407475565.pdfIn PDF document text
    • http://kawofeme.iblogger.org/tudujopaget.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467003/normal_6032c63c18e74.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489598/normal_6006751f44eb0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449193/normal_6035cb195feed.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4465387/normal_5fd94697cd296.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501980/normal_602b3d5d0ca1e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4403685/normal_5ffec41d3bcd5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nedijowewoded/70751576771.pdfIn PDF document text
    • http://lebodixo.epizy.com/drinkwell_platinum_pet_fountain_water_pump.pdfIn PDF document text
    • http://lukovim.epizy.com/bejug.pdfIn PDF document text
    • http://didajuna.rf.gd/the_man_in_the_high_castle_ending_season_1.pdfIn PDF document text
    • http://gazugitub.epizy.com/1148073337.pdfIn PDF document text
    • http://xituduriximujat.epizy.com/spoken_english_course_for_beginners.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/nuruwami.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_off0000eba0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEBA0 5124 bytes
SHA-256: 24954b21682bb55d8f03fc198e550991a7478a0c46614b4295d90f8700404503
font_01_sfnt_off0000fcfc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCFC 11320 bytes
SHA-256: 9a042645b8a09edfa2a5d46107adea2f109d31a9255f810fd45cb438f2d11051

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