Malicious PDF — malware analysis report

Static analysis result for SHA-256 e7e926ed08c10b1d…

MALICIOUS

PDF

82.8 KB Created: 2021-06-09 03:00:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: c473d5e2282c0925ebd9f64a7efa9cf5 SHA-1: 4162203c645052cad55ba16f330a6b3982d4d88f SHA-256: e7e926ed08c10b1d2f08c727da439557f9e2d0feaee5f8fd398d9bc9a3c64270
186 Risk Score

Malware Insights

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

The PDF file contains numerous external links, many of which are hosted on disposable domains, suggesting a link farm or phishing attempt. The heuristic PDF_SEO_LINK_FARM and PDF_SEO_DISPOSABLE_LINK_FARM indicate a large number of external links designed to appear as search engine results. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://philabc.ru/pbw?utm_term=plants+vs+zombies+2+pak+download+pc PDF link annotation
    • https://zosesudemosovar.weebly.com/uploads/1/3/4/8/134865665/risitefodexen.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470380/normal_6044dab985315.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4427529/normal_601704d90eca6.pdfIn PDF document text
    • https://zovaxisudu.weebly.com/uploads/1/3/4/7/134729802/simepuwetedi-tamezefot-piguzovu.pdfIn PDF document text
    • https://pifaxatopegamu.weebly.com/uploads/1/3/4/1/134108845/parukevukig.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gazumadu.pbworks.com/w/file/fetch/144903474/berixi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/29f04ad0-c0fc-4969-8f2b-419e35e27f3d/after_20_years_o_henry_summary.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e8f0854-b9d7-43c4-be24-0e186ee0bbbe/what_is_understanding_by_design_framework.pdfIn PDF document text
    • http://mefijunov.pbworks.com/f/67665856167.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/91b3ba91-c674-4d04-b898-764e9be4e684/how_do_i_lookup_osha_citations.pdfIn PDF document text
    • http://sozakuvepar.pbworks.com/w/file/fetch/144508071/95623164709.pdfIn PDF document text
    • http://xojifot.pbworks.com/w/file/fetch/144426552/98756649209.pdfIn PDF document text
    • http://xuwuziz.pbworks.com/w/file/fetch/144527346/440892682.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09a2b133-6233-43ac-9368-bcdc31da58c2/ximux.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ec9205c-7f9f-40de-9509-444e54b01dfc/is_it_good_to_stretch_sore_muscles.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c750341-6e55-40d4-961d-c227a26e01b9/59343836301.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07cf47ae-1abb-4df9-a542-050d08d87389/what_is_the_cause_of_alternator_not_charging.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e663.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE663 5660 bytes
SHA-256: b805ed78193855dbae9d25613f0975e74229f04d7f16c0fb2e2a5807137006cd
font_01_sfnt_off0000f9be.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9BE 11464 bytes
SHA-256: cecbd082181a560cd9a1d3620798696f21390951e885ffb2072e57523ee7b3e1
font_02_sfnt_off00011ff0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FF0 16612 bytes
SHA-256: 668b9684769a1468752d7a7c0f2fe499de1e2a347e8e0b35a63416e4f92d76b8
font_03_sfnt_off000135d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x135D8 1736 bytes
SHA-256: 1648accd5638f26481c437d0e436fdfb03edab78dab75f4e73239278c8cddc19