Malicious PDF — malware analysis report

Static analysis result for SHA-256 cfc41b5085fa21dd…

MALICIOUS

PDF

88.5 KB Created: 2021-03-22 10:21:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 54cd92cdfd3e892f84ba2d2aa5f882be SHA-1: 14189e743956da628057ba172fdb290bbeeed0d9 SHA-256: cfc41b5085fa21dd3758310d004e5bc6c9ba24953890a2c2a67571fadcf3bd42
156 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9994

Heuristics 5

  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=saitek+x52+profile+dcs+huey PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393889/normal_6047ba06a17d6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419818/normal_601b1f3aa79f1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470828/normal_602e079b277ae.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4454040/normal_603230936ecf4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388162/normal_60352dd066f2b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473340/normal_6056a899c41c5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4410207/normal_5ffcf0b3d03ca.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
    • https://d2ea4bfc-f92a-4379-acf2-d9b69981ddb7.filesusr.com/ugd/739437_bcb424db49f54e6d855f47e250dea098.pdf?index=trueIn PDF document text
    • https://da99f664-88c7-4a27-98aa-0bbcec2e8f57.filesusr.com/ugd/66f3f9_326c59e2d90647f18b6151df724cda24.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_f9482c0b48b0445ba14b67bceb744fd9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/vukumesoj/23848486237.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/what_is_the_critical_thinking_skills.pdfIn PDF document text
    • https://1a9cd40a-f0d6-44d4-a143-19288280ca2b.filesusr.com/ugd/7a13df_59e7ad2597fc4c72b820f66d9b974d90.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/semomoniferozuv.pdfIn PDF document text
    • https://s3.amazonaws.com/rawesaragegugar/16480804276.pdfIn PDF document text
    • https://s3.amazonaws.com/jijumupade/linksys_re3000w_setup_guide.pdfIn PDF document text
    • https://3794eb9c-cc8b-492c-aecc-44533f76aaa6.filesusr.com/ugd/1ee69b_57f87eeb6eb2400b821b98e5e42608b1.pdf?index=trueIn PDF document text
    • https://30383b9b-b26a-44f4-9a26-03873af8f03c.filesusr.com/ugd/fdee49_2517474fc7f94bbaaca670d374363e68.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rirusozo/atari_flashback_7_2_player_games.pdfIn PDF document text
    • https://cad90261-f038-4e8a-b384-2e0e37e6cb8c.filesusr.com/ugd/4c4e45_08da2025cf574a3285e5f0acc125b984.pdf?index=trueIn PDF document text
    • https://f7e05ffc-afae-4d19-be15-7e9c659e5e5f.filesusr.com/ugd/72f62b_30fc3db1c5af44ac9b32e6b257b384b9.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/baxunaf/60928307526.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_off00010c9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C9B 5612 bytes
SHA-256: 6e02940b64089886eea4d72051e0833b9f7da113f525083944b761ffed085296
font_01_sfnt_off00011fd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11FD1 11592 bytes
SHA-256: b7827cbaa04cd1d0bb5196fd210437c711479730daa06a6b77e2c7e43bc49f1c
font_02_sfnt_off0001467f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1467F 4324 bytes
SHA-256: 7f6049e5011acf0e8581793f2bc2bb947aac2929fdb77abc318b2a6155c1ef71

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