Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4136fd6a08aec9b…

MALICIOUS

PDF

88.5 KB Created: 2021-04-05 22:16:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 36b2956883e9e4d946f9d5a97a187e88 SHA-1: 7f715d3d16b245dc5641246b80806809497280d2 SHA-256: f4136fd6a08aec9b2137ddb064572c1a8c3800a85dd9bf58f74f6a6246159233
126 Risk Score

Malware Insights

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

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting a phishing or malware distribution lure. Although no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attack pattern involving redirection to malicious sites.

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://maypoin.ru/wix?keyword=mega+man+battle+network+guide
    • http://dmdmassage.com/718363995914008a.pdf
    • http://sevosegopuro.iblogger.org/96786508817.pdf
    • http://wumewil.sportsontheweb.net/creative_self_portrait_art_ideas.pdf
    • http://dirtygirl.fun/guzafofekuxanotmoh0r.pdf
    • http://deladinabixek.sportsontheweb.net/wodifuvalowapebogotefefos.pdf
    • http://subbellassecret.com/bivabegunakunag7wuje.pdf
    • http://copyrightram.net/buzizuwonenisesai4dv6.pdf
    • http://fimewovoko.getenjoyment.net/ipo_roadshow_presentation.pdf
    • http://wirobigi.medianewsonline.com/55080722111.pdf
    • http://polikarmonolit.ru/sotojutajaljxb9u.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://vipovanur.epizy.com/29393122440.pdf
    • https://dacf5b84-f80e-4bd8-bb7f-22aad20a1cd8.filesusr.com/ugd/285be4_62f6687a04194b64bcd04d783fec3d3a.pdf?index=true
    • http://pitugozuput.epizy.com/feligegugotejowefi.pdf
    • https://21a67f6d-2aea-439f-a910-ed4feb6be009.filesusr.com/ugd/173616_2ec5d8fd9ef749008f3ab4f2700ac802.pdf?index=true
    • http://vefabafodibejeg.epizy.com/muzojesitaxirefelovinol.pdf
    • https://ddd59a73-be73-4575-bd7b-2e5900175f8b.filesusr.com/ugd/5dc0ef_bb5c75acf48547ee98b6ac548c5b437c.pdf?index=true
    • https://7404da97-7fcf-4d5f-9d5f-3f8644e6773a.filesusr.com/ugd/35f767_efcc49a999d2435db169d47d88271c5d.pdf?index=true
    • http://fukuselumetu.myartsonline.com/architecture_definition_document.pdf
    • https://4a39c6c9-989b-4d11-b2d8-cc0becc7f193.filesusr.com/ugd/ef0078_81e4b46e587e4188a91e10e164cf1634.pdf?index=true
    • https://cf2e1f24-e5f1-4289-9567-3affce9c164e.filesusr.com/ugd/a4ea6c_2d72f7f67e774a9faac22c0694e33254.pdf?index=true
    • http://wolekepivezune.rf.gd/fhwa_report_bridge_deck_drainage_guidelines.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011ca5.bin
42c571c0f665345fff34ca3fe43e949f9e0a0c39af0c8b9e2021aef4ffccbe2c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11CA5 5268 bytes
font_01_sfnt_off00012e95.bin
0c62ed6d0d6ffbd5d92d2023133953a331fd3cd08d805e0af4994d39643f4092		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12E95 10732 bytes

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