Malicious PDF — malware analysis report

Static analysis result for SHA-256 80ac8ee3aac5ab72…

MALICIOUS

PDF

73.6 KB Created: 2021-03-02 20:52:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 27b80ecda77d3c718a7d972b0d06b944 SHA-1: b5b6a586aa825ea1639847ddb66ae0a87ebc1c7f SHA-256: 80ac8ee3aac5ab7280d4bb7755c0004df2ea35c18d6b15a818a0432abccf59b6
156 Risk Score

Malware Insights

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

The PDF contains numerous external links, a common tactic for SEO spam or phishing, and is flagged by ClamAV as a phishing trojan. The embedded document body, though obfuscated, suggests a lure related to a 'Persona 4 guide'. The presence of many external links, including one to 'kuzutuzo.ru', indicates an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://kuzutuzo.ru/wix?keyword=persona+4+guide+july
    • https://cdn.sqhk.co/gevajoke/jQU5hbY/contact_football_agents_in_europe.pdf
    • https://cdn.sqhk.co/balatexoriv/Xjc4ehg/riders_racing_game_download.pdf
    • https://niritopep.weebly.com/uploads/1/3/4/6/134634222/9231513.pdf
    • https://turugoduzo.weebly.com/uploads/1/3/0/7/130739986/7131423.pdf
    • https://cdn.sqhk.co/toxinize/zihr8J9/35050815847.pdf
    • https://wuwebiwurumebil.weebly.com/uploads/1/3/1/1/131164488/divorifaxiwiv_dazujoli.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://puwavunetese.rf.gd/what_is_mechanical_engineering_salary_uk.pdf
    • https://s3.amazonaws.com/towakog/botavamaxurawipujugusor.pdf
    • http://gikutixutawax.epizy.com/mewukitasiz.pdf
    • https://s3.amazonaws.com/zumomasugipeno/porudugijevunesodewele.pdf
    • https://s3.amazonaws.com/sewamos/chorioamnionitis_guidelines_rcog.pdf
    • http://rolozaj.epizy.com/tamilrockers_hd_movie_2018_isaimini._co.pdf
    • https://s3.amazonaws.com/wofaxil/accept_terms_and_conditions_checkbox_android.pdf
    • https://s3.amazonaws.com/zobuwubedak/splash_screen_animation_android_arsenal.pdf
    • https://s3.amazonaws.com/nijosinizo/sojopopebatexiwegow.pdf
    • https://s3.amazonaws.com/pafiganovavi/ayasa_piano_sheet_music.pdf
    • https://s3.amazonaws.com/woxojuxafopuv/philippine_accounting_standards_2019.pdf
    • http://toxosimokumo.rf.gd/riwuvuburudar.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_off0000e57c.bin
8b5501f9e5304aa3f044cab1fa205c4dfe102f3707ebb6d0bb0c80f23a54702e
pdf-font-stream PDF embedded font (sfnt) at offset 0xE57C 5260 bytes
font_01_sfnt_off0000f782.bin
f4b1bc3d72f2cc7fb1ec5c83ea8debe65ba8e2248932cfe40b84a92b9c0e2a9a
pdf-font-stream PDF embedded font (sfnt) at offset 0xF782 9928 bytes