Malicious PDF — malware analysis report

Static analysis result for SHA-256 8db32cb930d4b7df…

MALICIOUS

PDF

82.9 KB Created: 2021-02-20 07:54:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 24b99fb2362b0f71933d6d4092185b24 SHA-1: 6fb92943c9fdb177db4a799574aa0377563bab12 SHA-256: 8db32cb930d4b7df664ddbbe0ca2b6da3092c450f27c2ade035996ed86dac264
126 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution lure, likely delivered via spearphishing.

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/123?utm_term=war+and+peace+tv+show+vs+book PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4497079/normal_600cf4ffe1578.pdfIn PDF document text
    • http://luxshop21.site/fijojirisojewirilusavog7jua.pdfIn PDF document text
    • http://sofabufakuzod.22web.org/moonkin_guide_wow.pdfIn PDF document text
    • http://mifvideo.space/mivedifufenagff7gx.pdfIn PDF document text
    • http://axecheat8.xyz/laminate_countertop_sheet_samplesfz7bb.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408713/normal_600b4791c858d.pdfIn PDF document text
    • http://xevidome.iblogger.org/hernia_de_hiato_tipos.pdfIn PDF document text
    • http://virnet77.ru/279850126857k6v0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499351/normal_5fdad3a7e549b.pdfIn PDF document text
    • http://retys.space/stick_z_dragon_super_apk2b20c.pdfIn PDF document text
    • http://siteznakomstv69.space/24818401857ils1l.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://minizadoku.epizy.com/flexible_glass_mirror_sheet.pdfIn PDF document text
    • http://kutifakibidi.rf.gd/fadelekik.pdfIn PDF document text
    • https://s3.amazonaws.com/benubapopikaj/44919934300.pdfIn PDF document text
    • http://dixadenidufudu.epizy.com/gomipubudovikuxudaxew.pdfIn PDF document text
    • https://s3.amazonaws.com/megujobemegor/eraser_free_for_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/babetafaperaxov/wilsonart_plastic_laminate_sheet_sizes.pdfIn PDF document text
    • https://s3.amazonaws.com/roware/xenojokakaxesikaseta.pdfIn PDF document text
    • http://jebefufodapiwi.epizy.com/40980581837.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_off0000f99d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF99D 5240 bytes
SHA-256: 238970d5e0a8704b5b852a36c84b3a4e70ba5dc1b5aafc1fa0141480c8df12b4
font_01_sfnt_off00010b6d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B6D 10908 bytes
SHA-256: 2daa2d22fadd5c2d84679871c230690f59260b39a0f266ea70903b0b92d52884
font_02_sfnt_off00013065.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13065 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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