Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb0781d6daa328bf…

MALICIOUS

PDF

80.5 KB Created: 2021-01-30 14:12:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: eedc705f9339a0515d8c2700d5bfb812 SHA-1: 37184c7649e912b05fa5686c4f7f5bd6149a5e48 SHA-256: fb0781d6daa328bfb7de2bc83e783039aa0fa078623077d78dff1f39dfae1262
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, identified as a 'PDF_SEO_LINK_FARM' heuristic, suggesting a malicious intent to manipulate search engine results or redirect users to potentially harmful content. The ClamAV detection and ML classifier further support its malicious nature, flagging it as a phishing trojan. While no scripts were explicitly extracted, the presence of embedded URLs and the link farm structure indicate a likely attempt to deliver a second-stage payload or phish users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://trafficel.ru/wb?keyword=iowa%20trails%20council PDF link annotation
    • https://cdn.sqhk.co/gitopedevid/ajgjbeN/negin_mirsalehi_height.pdfIn PDF document text
    • https://cdn.sqhk.co/linotepibubi/dRiageP/zombie_shooting_games_dead_city_mod_apk.pdfIn PDF document text
    • https://nivujetomut.weebly.com/uploads/1/3/4/7/134753784/nuzaluxa-wowedovapuxu.pdfIn PDF document text
    • https://duxetaxegijojem.weebly.com/uploads/1/3/4/8/134870405/jozaku-getuxilasineba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475382/normal_601252c8ea6de.pdfIn PDF document text
    • https://debovibeki.weebly.com/uploads/1/3/4/7/134715081/zepuwasomepekufukaw.pdfIn PDF document text
    • http://silvanozito.online/drive_and_park_onlinepzw9b.pdfIn PDF document text
    • https://genunilime.weebly.com/uploads/1/3/4/3/134344847/kosibobozamejotiw.pdfIn PDF document text
    • https://cdn.sqhk.co/fakobijo/llifgjh/basketball_gyms_in_honolulu_hawaii.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonotiso/zhhhenv/doom_2_level_32_walkthrough.pdfIn PDF document text
    • https://zokolukesowi.weebly.com/uploads/1/3/0/7/130776120/fd2c94f7d8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bifadiwuwileji/ripudekuzedemoripobajadok.pdfIn PDF document text
    • https://s3.amazonaws.com/jodabiladezot/speech_and_language_development_chart_asha.pdfIn PDF document text
    • https://s3.amazonaws.com/sajezife/voroz.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/westworld_game_apk_mod.pdfIn PDF document text
    • https://s3.amazonaws.com/xovajukoxin/14955840428.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fe4d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE4D 4824 bytes
SHA-256: 53c53f59dd584686f935244ab6cc5a0ecebd3a7fc484fc15574a9641ac20288f
font_01_sfnt_off00010ed3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10ED3 11228 bytes
SHA-256: 31d1bbea56cf26929956ef18e673574bf81210392a76e4d198bfd05a6367b9a5

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