Malicious PDF — malware analysis report

Static analysis result for SHA-256 680158c165280b90…

MALICIOUS

PDF

74.1 KB Created: 2021-02-25 10:57:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 98124854ef5ca200181afe39b674f21f SHA-1: fd737f17658134aadf25b2bdc6de51112c98b0f6 SHA-256: 680158c165280b90d9967d5a1c8195b5b790798fe868ff50028139e7061b5d96
126 Risk Score

Malware Insights

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

The file is identified as malicious by ClamAV and an ML classifier, with heuristics indicating it's a link farm on disposable hosting. The PDF contains numerous embedded URLs, including one pointing to 'maypoin.ru' which is likely a phishing or malware distribution site. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it's designed to redirect users to malicious content, aligning with a phishing or downloader attack pattern.

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://maypoin.ru/strik?utm_term=microsoft+windows+networking+essentials+pdf+%25D1%2581%25D0%25BA%25D0%25B0%25D1%2587%25D0%25B0%25D1%2582%25D1%258C PDF link annotation
    • http://hookup153.site/zapopo6njw3.pdfIn PDF document text
    • http://fanisore.sportsontheweb.net/51462852356.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409607/normal_602867f4302b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415070/normal_6028f8e0d0b82.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446273/normal_6015ab59ddf02.pdfIn PDF document text
    • http://theplafond.xyz/44194468373yg430.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403823/normal_60138eb1d15dc.pdfIn PDF document text
    • http://pakirekugep.scienceontheweb.net/kodak_eis_hd_1080p_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481157/normal_6031dd9307888.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408990/normal_5fe6894494589.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485579/normal_600e3ddae94b3.pdfIn PDF document text
    • http://armlur.space/metal_gear_solid_5_chapter_1_walkthroughpogt3.pdfIn PDF document text
    • http://rawoxaxevog.mygamesonline.org/83777044444.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zutugidod.onlinewebshop.net/how_to_replace_a_fan_clutch.pdfIn PDF document text
    • https://s3.amazonaws.com/zifozujiwi/american_buffalo_knife_and_tool.pdfIn PDF document text
    • https://s3.amazonaws.com/zagubip/8847727343.pdfIn PDF document text
    • https://s3.amazonaws.com/xazarujokemus/vuzopok.pdfIn PDF document text
    • https://s3.amazonaws.com/tufitijinexu/44496576383.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_off0000e18f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE18F 6112 bytes
SHA-256: fe1b40426723b5c71267b95810ac6aba395272b9ec47c83883dcb82e50693a7b
font_01_sfnt_off0000f5b8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5B8 9992 bytes
SHA-256: f9e66b7e7b7e745c312f7c088251edd376ec64704fb43242b9f8d2371fbd0b18

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