Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5aa3536d92abb19…

MALICIOUS

PDF

77.4 KB Created: 2021-04-09 06:16:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6eb973dc6371f61da728930f38522c47 SHA-1: b369476d90c7e62a0ae6abcd224760c2defcf72a SHA-256: a5aa3536d92abb1990bb3d35213918794636c2e40b78ec245b1283ae131e172c
186 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as a malicious link farm, with a high ML classifier score and ClamAV detection. It contains numerous external links, including one to 'gimoguvi.ru/strik' which appears to be a phishing or SEO manipulation attempt. The document body is heavily obfuscated, preventing a clear understanding of its specific lure, but the presence of embedded URLs and the link farm structure strongly suggest a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://gimoguvi.ru/strik?utm_term=how+to+mix+hair+dye+and+developer PDF link annotation
    • https://kowojifab.weebly.com/uploads/1/3/4/6/134622532/5376532.pdfIn PDF document text
    • https://zamuwute.weebly.com/uploads/1/3/0/9/130969683/kagezoviluroxalepugi.pdfIn PDF document text
    • http://forajadafogaxuv.medianewsonline.com/time_and_work_shortcut_formula.pdfIn PDF document text
    • https://paludiwebi.weebly.com/uploads/1/3/4/0/134012690/duzunavotowodukina.pdfIn PDF document text
    • https://kubinivoboduwu.weebly.com/uploads/1/3/4/6/134601548/ca5c3ad6.pdfIn PDF document text
    • http://zonokiwuwagupu.getenjoyment.net/gimagubuta.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://141ebdc9-a3c9-4c6d-b8f9-366dbf139dec.filesusr.com/ugd/46bfb0_333c4fdfd449477b828128cd92d0a5d7.pdf?index=trueIn PDF document text
    • https://7c3a386c-9197-44ff-a2a0-26a6be1b6260.filesusr.com/ugd/bba797_cfb2c48e1c9f425eadfd3e7d99b93263.pdf?index=trueIn PDF document text
    • https://9eaa565e-fb97-40b4-b096-d6760803f699.filesusr.com/ugd/55e2c6_2e7677d484494595a0d3af950d9c161e.pdf?index=trueIn PDF document text
    • http://sulumasofip.epizy.com/kegezev.pdfIn PDF document text
    • https://s3.amazonaws.com/xipavir/irregular_verbs_worksheet_ks1.pdfIn PDF document text
    • https://s3.amazonaws.com/xebuvuwov/equidad_de_genero_en_mexico_2018.pdfIn PDF document text
    • http://wegajovekesowor.epizy.com/musabifimawivemorekukix.pdfIn PDF document text
    • https://s3.amazonaws.com/nagudo/61074520908.pdfIn PDF document text
    • https://e4fb9bf1-a3d6-4767-9bf2-2a1021e5dc09.filesusr.com/ugd/53cfc7_53abcd2743034edc9cb453464818e830.pdf?index=trueIn PDF document text
    • https://101c3d73-5e22-4da1-a203-a3a2a794ce88.filesusr.com/ugd/69a512_db8ec53380e347f9a1bb8e48bc60740a.pdf?index=trueIn PDF document text
    • https://77483064-5892-4b52-b419-66e751946b77.filesusr.com/ugd/ef7b09_de569e19497e4f32a228b42dfe444cda.pdf?index=trueIn PDF document text
    • https://eb62986f-0112-409a-9ebe-777412bc5c19.filesusr.com/ugd/26938b_f4ca6b4095bd45fcaa12650644341458.pdf?index=trueIn 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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 5304 bytes
SHA-256: 801ff4c749dfe95aa7e0cc14ac85307fc241d3287c4989d93e27bd8bb7c3ab48
font_01_sfnt_off00010240.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10240 11376 bytes
SHA-256: cf1fe34edd89c0df9f6bf4da453a648450feebbd4173b7df0bd634ed87b8b20e

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