Malicious PDF — malware analysis report

Static analysis result for SHA-256 8474f89fcee0d4da…

MALICIOUS

PDF

78.9 KB Created: 2021-04-03 19:43:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 19320d877081c1f6af16c8f8821a43f4 SHA-1: 80e6ad259f0ef24b1d82457e8c9f54cdac0fcde6 SHA-256: 8474f89fcee0d4da5bb7289f4035ae8ac2d9d986592150667467a6292fc0e2cd
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to Weebly and sqhk.co domains, suggesting a link farm or redirection mechanism. The presence of a ClamAV detection for 'Pdf.Phishing.Trojan' and ML classification strongly indicates malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive external linking are characteristic of phishing or malware distribution campaigns, likely using embedded JavaScript to facilitate the download of a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://seumenha.ru/wix?keyword=comcast+st+augustine+channel+guide
    • https://rubexanow.weebly.com/uploads/1/3/5/3/135346757/a527fe1165fe.pdf
    • https://fubalaxusagipun.weebly.com/uploads/1/3/4/1/134108832/xubovewuvipo.pdf
    • https://cdn.sqhk.co/setuboluraje/ggjfigE/megezozobudimutolel.pdf
    • https://nerolokem.weebly.com/uploads/1/3/5/3/135326062/kekifepadepe-daludutoduj-ditakugubowo-somumonipamitav.pdf
    • https://cdn.sqhk.co/nebafori/jhj3jdN/small_red_rose_tattoo_behind_ear.pdf
    • https://cdn.sqhk.co/bawijodol/bjciiii/24224398720.pdf
    • https://diziwupufetut.weebly.com/uploads/1/3/4/4/134477772/2e90a661f4.pdf
    • https://cdn.sqhk.co/gibewuzavi/vIThgic/warhammer_4th_edition_magic_items.pdf
    • https://cdn.sqhk.co/balijanawi/tgd1tcW/sadinalenegimomerem.pdf
    • https://cdn.sqhk.co/dedikifefisu/ghziiig/clp_holdings_limited_annual_report_2019.pdf
    • https://cdn.sqhk.co/nozedimasav/2jbyif3/lausanne_2020_youth_olympics_hockey.pdf
    • https://leduzurukidep.weebly.com/uploads/1/3/4/8/134858842/kinup-mamimofawuz.pdf
    • https://cdn.sqhk.co/rivojotewez/haa0jji/cordial_cherries_with_clear_liquid.pdf
    • https://cdn.sqhk.co/kukusagufo/ihlhHK6/break_the_prison_game_prison_5_level_500.pdf
    • https://cdn.sqhk.co/kivipemo/CFgdiND/wobokosomapodotiw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xufaxoferugod/varawijutijazetejubejod.pdf
    • https://s3.amazonaws.com/zinudipir/65329777950.pdf
    • https://s3.amazonaws.com/xufujofaleki/19986336155.pdf
    • https://s3.amazonaws.com/zabejuvijolu/kadizisuwakabulawumari.pdf
    • https://s3.amazonaws.com/xovajukoxin/paper_bag_monster_puppet_templates.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_off0000f704.bin
e89105721c085c2949f0b4b647b79cb1428f6aa91d34fc49ef1374dde02c65f2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF704 5160 bytes
font_01_sfnt_off00010861.bin
9b6b8acc8f505fc130bdf3d8e08fded56a2638518734640f9e67f7e7a4cfd893		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10861 11276 bytes

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