Malicious PDF — malware analysis report

Static analysis result for SHA-256 0941a31a9f0dcf99…

MALICIOUS

PDF

93.7 KB Created: 2021-04-02 18:55:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 68fcc2f665cbac0526f14bfb25efd82c SHA-1: d2e908a0ccdf9d48bd7f5859d5fa4afd0b90a5ff SHA-256: 0941a31a9f0dcf994dd246a44eb5b5feab6a0e4c6513a490db44470dadcba4e1
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by both ClamAV and an ML classifier. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm or redirection scheme. The document body, though heavily obfuscated, appears to be related to legal sentencing guidelines, likely a lure to encourage clicks on the embedded URLs.

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://dugedepap.ru/123?utm_term=aiding+and+abetting+sentencing+guidelines+uk PDF link annotation
    • https://zepudelewow.weebly.com/uploads/1/3/2/6/132682561/tisomi_dolezemig_nomaxajuk.pdfIn PDF document text
    • http://rapisakaxo.66ghz.com/zimud.pdfIn PDF document text
    • http://nariwunuzaw.scienceontheweb.net/pibekepaxenebowapamuli.pdfIn PDF document text
    • https://vufepuxo.weebly.com/uploads/1/3/4/5/134522835/4528451.pdfIn PDF document text
    • https://pejivepomut.weebly.com/uploads/1/3/5/3/135339444/sewewapomirosaboto.pdfIn PDF document text
    • https://taruzalo.weebly.com/uploads/1/3/5/3/135398133/66f3531b56a5aa3.pdfIn PDF document text
    • https://sizokagijabid.weebly.com/uploads/1/3/4/6/134652394/wosanife-kogulikoj.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pasulupumorowim.myartsonline.com/the_turn_of_the_screw_by_henry_james.pdfIn PDF document text
    • http://mozutulobiris.onlinewebshop.net/vuxet.pdfIn PDF document text
    • https://s3.amazonaws.com/kelageketisefuv/1842709071.pdfIn PDF document text
    • http://zekezixurul.onlinewebshop.net/rodufeguxomofudated.pdfIn PDF document text
    • https://97a45c9e-1ab5-462a-bfe2-fded34b9a8b9.filesusr.com/ugd/b50c55_98ce9f747d144dc380b808535a4224ba.pdf?index=trueIn PDF document text
    • http://pulijivugis.epizy.com/86307169592.pdfIn PDF document text
    • http://raseloxezonavo.epizy.com/airtel_bill_by_relationship_number.pdfIn PDF document text
    • https://s3.amazonaws.com/zonivezada/naxelatorojowo.pdfIn PDF document text
    • https://7f58a6d3-5723-489e-a2bd-17fd91e1ddd5.filesusr.com/ugd/655495_d6022df345b94f3d885433a47b072618.pdf?index=trueIn PDF document text
    • http://sefeluxezilire.epizy.com/pemesiseziru.pdfIn PDF document text
    • https://37e0f79d-b0c1-4727-b76d-5b759c81288f.filesusr.com/ugd/9c66ff_79b50dfe9aa44cbc92915caba7eb18f3.pdf?index=trueIn PDF document text
    • https://39c3e2ba-dcb8-4bc0-9ed7-0058f02c59d5.filesusr.com/ugd/fd4c29_cbe5eaae2d00415e9517402b350f5271.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/pisedij/gexamasabiwupawimik.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_off00012fbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FBC 5204 bytes
SHA-256: 27493757f33bb30b9f1f6f9e3d0b191c31c4d9866e494e94a0653f6f49d8e910
font_01_sfnt_off00014187.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14187 11572 bytes
SHA-256: dcbff4a7d92989fb49fd3d7374c15f1b51ec883ac4cd0dbd2b56db150e827c59

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