Malicious PDF — malware analysis report

Static analysis result for SHA-256 661d84191c7cc671…

MALICIOUS

PDF

77.8 KB Created: 2021-03-20 06:48:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19e016e00e6c9b76a51481f14aa1a8f6 SHA-1: 7fa7b71e3650dd9bad7fa0e55bd075e81a5de0e6 SHA-256: 661d84191c7cc6716f5f5412059555440a4b81c31fc44d4bfb2fa34cc08e4df7
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains numerous external URIs, with a primary one pointing to 'botokaw.ru', suggesting a redirection or download attempt. The document body, though heavily obfuscated, contains text related to Shakespeare and the wkhtmltopdf tool, likely serving as a lure to disguise the malicious intent.

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=what+words+did+shakespeare+make+up+that+we+use+today
    • https://vuwuzujos.weebly.com/uploads/1/3/2/7/132712237/zituwozevim.pdf
    • https://cdn-cms.f-static.net/uploads/4464861/normal_603a761fae6e4.pdf
    • https://cdn-cms.f-static.net/uploads/4463824/normal_6050e971e4ff6.pdf
    • https://vafumigoku.weebly.com/uploads/1/3/1/3/131384305/6adbb1.pdf
    • https://tojipojewusaw.weebly.com/uploads/1/3/0/8/130814735/5045fb42b8a.pdf
    • https://vonuvevija.weebly.com/uploads/1/3/1/4/131407152/9648642.pdf
    • https://zibefaxad.weebly.com/uploads/1/3/4/5/134594794/7c965091fe.pdf
    • https://losewilim.weebly.com/uploads/1/3/4/8/134854933/nejopijapiku_tigiriwe_wubosaruxox_rexuwubazaxosul.pdf
    • https://cdn-cms.f-static.net/uploads/4480745/normal_602df9512e203.pdf
    • https://bozalofagolukor.weebly.com/uploads/1/3/0/9/130969011/897185.pdf
    • https://dekodisiga.weebly.com/uploads/1/3/6/0/136051758/vasakufafodivati.pdf
    • https://static.s123-cdn-static.com/uploads/4409257/normal_5fe01135e5f7d.pdf
    • https://static.s123-cdn-static.com/uploads/4491705/normal_5fe188b8ec01a.pdf
    • https://vakogupomuniv.weebly.com/uploads/1/3/4/6/134610568/xebujarona_gadusunav.pdf
    • https://cdn-cms.f-static.net/uploads/4421476/normal_604765865f9fe.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/8709764b-8a22-4f03-9751-cae6a45c5ec5/distinguish_between_n_type_and_p_type_semiconductor_on_the_basis_of_energy_band_diagram.pdf
    • https://uploads.strikinglycdn.com/files/cfe573ae-2ed5-4c58-bff1-1270e3b55e2d/wahls_protocol_recipes_breakfast.pdf
    • https://s3.amazonaws.com/redegelesibif/90136895898.pdf
    • https://uploads.strikinglycdn.com/files/1cbe9d08-7e99-40fd-862c-9f0fc8f6b468/stihl_ts400_parts_diagram.pdf
    • https://uploads.strikinglycdn.com/files/0657da47-3154-4b36-87d5-27326abfaabf/what_are_the_4_principles_of_design.pdf
    • https://s3.amazonaws.com/fuwawibu/former_channel_7_boston_news_anchors.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_off0000f1ba.bin
2d89df7581978cd9e2519817260eeeee4185c235d61e39e157365f4973f3d7fa		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF1BA 5440 bytes
font_01_sfnt_off0001042c.bin
be13465f5823198be16cb9eb80072ce059d1dbcfeaa38e174be86ae2bfc5a8e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1042C 10952 bytes

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