Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f364dea43b26e88…

MALICIOUS

PDF

99.4 KB Created: 2021-02-27 16:43:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d4566c7535cd7d8f98f28878eea1d6b9 SHA-1: 39970191989c8dfe6ca54f1710e5893c37e2ed5c SHA-256: 7f364dea43b26e881556592cd7bea16e98e85d306e367d75f0365b398becd2df
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 0.9997

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://resalured.ru/123?utm_term=dnd+monsters+by+terrain PDF link annotation
    • https://cdn.sqhk.co/fuwufupi/cZ8hiEF/wisifovisa.pdfIn PDF document text
    • https://cdn.sqhk.co/lekusovu/ihzgeOX/66346072333.pdfIn PDF document text
    • https://zujuwedidikaf.weebly.com/uploads/1/3/4/3/134375258/wepopatoboteme.pdfIn PDF document text
    • https://cdn.sqhk.co/modajili/gugdOgh/worst_game_on_steam_2020.pdfIn PDF document text
    • http://dvigatel.guru/wixulefaripivowowutovopikf2n2.pdfIn PDF document text
    • http://wawupamol.iblogger.org/roulette_strategy_that_works_best.pdfIn PDF document text
    • http://immortal-sho.club/avira_antivirus_security_pro_androidbajm8.pdfIn PDF document text
    • https://sawuwirepugasup.weebly.com/uploads/1/3/0/9/130969548/zibapenedige_novotajijapev_faxir.pdfIn PDF document text
    • https://jojusilinu.weebly.com/uploads/1/3/4/3/134343509/wudotu.pdfIn PDF document text
    • https://rofekituluz.weebly.com/uploads/1/3/2/3/132303072/1416178.pdfIn PDF document text
    • https://gubagomokugexat.weebly.com/uploads/1/3/3/9/133988684/decc69450b8.pdfIn PDF document text
    • http://meetsucre.pro/pilupuwuguxufokevuxekaa662e.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://vewomani.rf.gd/roasted_chicken_nutrition_information.pdfIn PDF document text
    • http://jefiwimagi.epizy.com/78762909242.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00013e52.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13E52 4968 bytes
SHA-256: beff84bbedd50d0d94d3ff1a5402eb49a5734a29e1c38bf5efa0672e24111dbf
font_01_sfnt_off00014f16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F16 10388 bytes
SHA-256: 12dc2183100a52bf53f05e0c79fcb40a9a66628452cff2cee97f1fa749cef3c7
font_02_sfnt_off0001727e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1727E 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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