Malicious PDF — malware analysis report

Static analysis result for SHA-256 197f9198e2f516ba…

MALICIOUS

PDF

80.4 KB Created: 2021-04-29 21:12:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: 4f39ec0e9c39635b1319af236ad15a1e SHA-1: 2bfff60588dd695d38d522fbbcacbf9d1be97963 SHA-256: 197f9198e2f516babac9335efc6e1a2155f9a65530e0b6bbdd052242376681c7
186 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains a large number of external links, suggesting it functions as a link farm, potentially for SEO manipulation or to direct users to phishing sites. The primary malicious URL identified is https://fokemale.ru/strik. The document's structure and embedded links align with techniques used to distribute malware or conduct phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://fokemale.ru/strik?utm_term=what+is+differential+pressure+sensor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4366662/normal_600a58490a37c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369507/normal_5fda48c45eb90.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489054/normal_5fe852e87c9a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c01188fd-d8af-4b86-846b-090f7ecd58d8.filesusr.com/ugd/9058e5_293a8aa0512043af9bc547f852761f28.pdf?index=trueIn PDF document text
    • http://wonitijaxexilo.rf.gd/nortel_t7208_feature_codes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/84e6913e-1529-4173-8417-282ac51b7c5c/48011520654.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c52555e8-a0f5-4385-9747-64b172158d9a/statistical_technique_in_business_and_economics.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68035923-cac3-42e2-b2b7-93bce6861bd8/mupafobupomaxo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5920066e-de08-4406-bc04-d4788c2f5456/45525403639.pdfIn PDF document text
    • http://dipuvomefig.epizy.com/sakudovigivipijesa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9c30dd9a-946f-4ece-8cc4-bae5b1791b59/zevejilusizak.pdfIn PDF document text
    • https://8f1ef4f7-3f23-41ef-a3d6-4e5873a175a2.filesusr.com/ugd/d318ce_59134b0fded445828d0c0e8a1531a190.pdf?index=trueIn PDF document text
    • http://julukawava.epizy.com/how_to_make_book_into.pdfIn PDF document text
    • http://lulikeleweworup.epizy.com/desojebigivalabilemibed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f2912c3-a7b2-47f3-89bb-539210ba1b7b/puwuvovuz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3824bb67-de51-41b9-b547-e0a34fe8eebb/can_you_call_a_female_warrior.pdfIn PDF document text
    • http://koxosam.rf.gd/pexozewujazavemuregado.pdfIn PDF document text
    • https://5f8b0e40-2141-4341-98ab-6145db4b8156.filesusr.com/ugd/2072cd_c7093f46ab1944aca8234530f061723c.pdf?index=trueIn PDF document text
    • https://ed59cdd8-0d75-4634-8bb2-7afdb9da103e.filesusr.com/ugd/9cb112_f59ec2cecfc543f08b6da48895472fea.pdf?index=trueIn PDF document text
    • https://6a9ecc2b-05c3-4056-8705-773ae6be8cdd.filesusr.com/ugd/7a359d_6fb36595371449b3b74bf0dd4ceb3214.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_off0000fc60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC60 5144 bytes
SHA-256: 174772c3e201df396f5fa940043f90600b08633242d202ad83a32d58bb7e476e
font_01_sfnt_off00010de5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DE5 11388 bytes
SHA-256: 39e7dc63268966f443abea93c3cabd652f7959a8eec165a9912383e2d21e8809