Malicious PDF — malware analysis report

Static analysis result for SHA-256 cf707a23e631f729…

MALICIOUS

PDF

82.5 KB Created: 2021-03-18 19:41:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 294bb8bdf196a743511e2630e07d6986 SHA-1: 12720eb1089415c595e5593fbbbb242dcd07673f SHA-256: cf707a23e631f729466ceae1f14e7717e249c8a3961d6301e7620e438edd1c04
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://vilenefex.ru/123?utm_term=stalingrad+by+antony+beevor+pdf PDF link annotation
    • https://vipobonufemug.weebly.com/uploads/1/3/5/4/135401160/2ab69305859f67.pdfIn PDF document text
    • http://womirewuzakuf.sportsontheweb.net/59567918217.pdfIn PDF document text
    • https://pebunapuvunasa.weebly.com/uploads/1/3/5/9/135970795/9ed2e8ce8e.pdfIn PDF document text
    • https://sojugadetoju.weebly.com/uploads/1/3/4/6/134683069/mulapezuz-pofowopitixe-widej-pagemo.pdfIn PDF document text
    • https://cdn.sqhk.co/bitomasijelo/xha7Sja/dino_hunt_and_shooter_3d_mod_apk.pdfIn PDF document text
    • http://xagakojitogiva.getenjoyment.net/ecology_and_environment_pd_sharma.pdfIn PDF document text
    • https://tozikogok.weebly.com/uploads/1/3/5/3/135330875/19122.pdfIn PDF document text
    • https://nigomiboxamu.weebly.com/uploads/1/3/1/1/131163879/9425845.pdfIn PDF document text
    • https://nimivumunekal.weebly.com/uploads/1/3/3/9/133999229/d12eb27a64fe7c.pdfIn PDF document text
    • https://toginomaba.weebly.com/uploads/1/3/4/0/134042469/4147627.pdfIn PDF document text
    • http://nujijaj.getenjoyment.net/africa_map_blank.pdfIn PDF document text
    • http://pamatidela.getenjoyment.net/muzoteledilula.pdfIn PDF document text
    • https://cdn.sqhk.co/fegujajox/gg9ieqM/zulomojovugujamagiputo.pdfIn PDF document text
    • https://raxeruzuk.weebly.com/uploads/1/3/4/7/134743740/9cc7c0151a432.pdfIn PDF document text
    • https://fobaripiso.weebly.com/uploads/1/3/4/4/134443650/fimuxeg.pdfIn PDF document text
    • https://tugesarafexo.weebly.com/uploads/1/3/5/3/135319839/7d5f327.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://734e8db3-b9db-457c-abaa-08c06218e7ae.filesusr.com/ugd/f6bb82_e0a796f9d7514be9bdea9871a0f3f9e8.pdf?index=trueIn PDF document text
    • http://rigidafavubo.myartsonline.com/57745148849.pdfIn PDF document text
    • https://21036261-01f9-4725-a342-2b8b08d10099.filesusr.com/ugd/d0cbc4_a81f90f015444798bc5ced468f4d2c55.pdf?index=trueIn PDF document text
    • https://d52aed46-be45-4f9b-8106-cf6fc7ee66c0.filesusr.com/ugd/b148e5_1ea885c7d58d4a0b8c57dd1f67c912db.pdf?index=trueIn PDF document text
    • https://5be7aec3-7d66-433b-ae1d-2bfb807ddf2a.filesusr.com/ugd/24deb6_243be508548f49b2aad4e3eac34811fa.pdf?index=trueIn PDF document text
    • https://1ffb5d6c-d890-49e0-9b87-dc10fbfa49e2.filesusr.com/ugd/8bc2a6_2d7ab4e764244697a088a02a9818a3f0.pdf?index=trueIn PDF document text
    • https://e29a9437-b0a5-48a6-9afa-908397ce514a.filesusr.com/ugd/16a9c1_919d4b97753b4e2a8f351eda8dd9ded8.pdf?index=trueIn PDF document text
    • https://4f7f339c-9ee9-4921-a7ad-794169edd555.filesusr.com/ugd/fea72b_83011dece13a459fa427923c92a50a4c.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_off0000f91a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF91A 5436 bytes
SHA-256: a94856c669cbc35ea9efef53af229c02104ec1bbe2b789d9c6e9a6cbde120c76
font_01_sfnt_off00010bad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10BAD 15612 bytes
SHA-256: 8b30a2566803d132f36bc18363c34696a043e66fb768e62331878b4fe510537a