Malicious PDF — malware analysis report

Static analysis result for SHA-256 a5cc4ce329383551…

MALICIOUS

PDF

80.9 KB Created: 2021-04-05 07:14:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e361fe6c813758a52536e9430cfa0d00 SHA-1: 61dbe39e8d85f209b3f119d3deab77375ed9fd47 SHA-256: a5cc4ce329383551ee5d52a8691419697641e045060a2b4c6d104b24193dd198
196 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

This PDF document contains a social-engineering lure, specifically a browser extension or update installation prompt, which is a common method for credential theft or malware delivery. The presence of numerous external links, including one pointing to a potentially malicious domain, further supports this assessment. While no scripts were directly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely involving exploitation or redirection to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://golowaki.ru/123?utm_term=google+chrome+extension+format+json
    • https://datugabow.weebly.com/uploads/1/3/4/7/134745554/kiriwojavobobu.pdf
    • https://panidulupeju.weebly.com/uploads/1/3/0/9/130969186/xenizojij.pdf
    • https://cdn.sqhk.co/giwibilawa/iiji8ic/kung_fu_tea_delivery_nyc.pdf
    • https://cdn.sqhk.co/potiribuwuf/jgoqJic/run_ninja_run_3_game_download.pdf
    • https://bixoriwapavam.weebly.com/uploads/1/3/4/7/134731951/8ab2598acac.pdf
    • https://roxogarafuxor.weebly.com/uploads/1/3/1/1/131164132/jadaluvewukotufose.pdf
    • https://cdn.sqhk.co/zerurukoraju/jdbNlgh/pogopelamofuzuravikizi.pdf
    • https://gabusuve.weebly.com/uploads/1/3/5/2/135297202/331359.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/novipaliwid/does_six_of_crows_have_romance.pdf
    • https://uploads.strikinglycdn.com/files/5f505d74-d118-4245-a6d3-82189af16c1b/nuwiluwasejusenamikanaben.pdf
    • https://uploads.strikinglycdn.com/files/63b94bca-e714-44a5-beda-cb638a7c2cbc/family_feud_questions_funniest.pdf
    • https://uploads.strikinglycdn.com/files/e601c211-5cad-464e-9a0c-58d9f4bbcc9a/49436402231.pdf
    • https://uploads.strikinglycdn.com/files/0cfa6659-c542-47f2-8ac2-8aae800ac1b4/in_defence_of_food_michael_pollan_summary.pdf
    • https://s3.amazonaws.com/xixonu/brightness_driver_for_windows_10_free.pdf
    • https://uploads.strikinglycdn.com/files/c63468c5-c7b9-4777-b243-185f5daf40d1/how_much_are_cal_spas.pdf
    • https://s3.amazonaws.com/xebuvuwov/gerrards_cross_church_of_england_school_uniform.pdf
    • https://uploads.strikinglycdn.com/files/d2a04263-3f44-4cc2-8f5b-7cd6c577530a/2003_honda_accord_ex_maintenance_schedule.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_off0000fa2a.bin
c24b90f1677fd2f55e81672c36c8e8fc0c99694bdcabd4a038c944b595e7ee8b		 pdf-font-stream PDF embedded font (sfnt) at offset 0xFA2A 5468 bytes
font_01_sfnt_off00010cad.bin
bf9d12b526fe539a678ae37e0881f1da857030732cd6e1aba13d3a98c1a40676		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10CAD 12032 bytes

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