Malicious PDF — malware analysis report

Static analysis result for SHA-256 f309061b8025d4c4…

MALICIOUS

PDF

71.8 KB Created: 2021-01-11 01:46:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d0a5260107ae293a2c3251f139a6e7c3 SHA-1: 403aae62617f25bd0ef319c33cda05f90271624e SHA-256: f309061b8025d4c47f23f3ff545226220626819abfdbabd08e642fabd8e406f3
214 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, with at least one identified as a malicious redirector. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the PDF structure itself is used to host numerous external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://gettraff.ru/123?utm_term=lenovo+t420+manual
    • https://cdn-cms.f-static.net/uploads/4490367/normal_5fb5bc02110c7.pdf
    • https://cdn.sqhk.co/jenexovu/fieLRB1/underhand_throwing_games_first_grade.pdf
    • https://static.s123-cdn-static.com/uploads/4384650/normal_5fdf4ae102051.pdf
    • https://cdn.sqhk.co/wiwifudu/ihjqihe/bakafuwabowudovomon.pdf
    • https://cdn.sqhk.co/konarolikomu/6cv282e/best_programer_for_6._7_cummins.pdf
    • https://cdn-cms.f-static.net/uploads/4366957/normal_5f8a3dbf0f6a3.pdf
    • https://cdn-cms.f-static.net/uploads/4500889/normal_5fb2b1c7d390a.pdf
    • https://cdn.sqhk.co/jaguwubax/jeVRDid/vua_bong_da_2020_hack_full.pdf
    • https://cdn-cms.f-static.net/uploads/4373757/normal_5fb3c6a10c3a3.pdf
    • https://cdn-cms.f-static.net/uploads/4389107/normal_5f920642d80d9.pdf
    • https://ribofefafuf.weebly.com/uploads/1/3/4/7/134770843/nevifemis-joladoz-gepubomoguwolad.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tawosutosuxi/wafivobiredisoma.pdf
    • https://s3.amazonaws.com/biwubeleba/yahoo_messenger_chat_room.pdf
    • https://s3.amazonaws.com/bisute/9984299174.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dbe6.bin
eb038335e10bcbc332c5c5dae2eec28359e9726d17f96d2cc029fb531c570983
pdf-font-stream PDF embedded font (sfnt) at offset 0xDBE6 4920 bytes
font_01_sfnt_off0000eca4.bin
7605cacb1fb3d41f739c4a9db7fdd9617580e7d4c4a61314652127f87bb8abf0
pdf-font-stream PDF embedded font (sfnt) at offset 0xECA4 10812 bytes