Malicious PDF — malware analysis report

Static analysis result for SHA-256 b292d9be1424512f…

MALICIOUS

PDF

87.8 KB Created: 2021-03-01 06:45:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 4290b1867ae8932c9738fa29d61ebd0c SHA-1: bf6cb03cab850ed883ade32d328e6219a641469b SHA-256: b292d9be1424512ff0f90cf083a01f1da9d40be8c078091109a4cac02f9ade89
126 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with one specifically pointing to a domain associated with malicious activity. Heuristics indicate the PDF is a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. The ML classifier also flagged it as malicious. While no scripts were explicitly extracted, the presence of numerous external links suggests an attempt to redirect the user to a malicious site, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://xajibur.ru/wix?keyword=volume+of+cylinders+cones+and+spheres+worksheet+key PDF link annotation
    • https://cdn.sqhk.co/gugosobor/ogejg5Y/bare_knuckle_fighters_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/dodamewope/5ibhb1i/wwe_raw_results_grades_bleacher_report.pdfIn PDF document text
    • https://lefojokux.weebly.com/uploads/1/3/5/3/135399193/lorowa.pdfIn PDF document text
    • http://freedate18.xyz/43131412302d61d1.pdfIn PDF document text
    • http://vinograd.io/samilujisowevozagodofija1shvm.pdfIn PDF document text
    • https://cdn.sqhk.co/gotofebelu/1if6hhp/dino_race_game.pdfIn PDF document text
    • http://pibodusu.22web.org/how_to_change_the_language_on_a_toshiba_tv.pdfIn PDF document text
    • http://sq11mini.com/white_fang_book_age_rating7bqux.pdfIn PDF document text
    • https://cdn.sqhk.co/juvexafi/ihAJaOL/large_keyboard_for_android_phone.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jibogifimot.epizy.com/kazuranafawakozu.pdfIn PDF document text
    • http://vogojitipam.epizy.com/88764951894.pdfIn PDF document text
    • http://wotikuvejuf.rf.gd/receptionist_resume_template_word.pdfIn PDF document text
    • http://rofumuramim.epizy.com/ford_555_backhoe_engine.pdfIn PDF document text
    • http://bimibukiju.rf.gd/apptoko_ios_11.pdfIn PDF document text
    • http://jorowoti.epizy.com/wedding_anniversary_songs_in_telugu_free.pdfIn PDF document text
    • https://s3.amazonaws.com/kefodek/furajibuxijakixe.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/81946607775.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010470.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10470 5616 bytes
SHA-256: c1e94813aad928baa5f4f39dff73c78124aaaabf6858f054ef4c08d11ae6da7b
font_01_sfnt_off00011782.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11782 10776 bytes
SHA-256: 8b2ba2b05d6a8318d99f6f493c138330aafbefa159d367dbf7f0ddc20d3cb333
font_02_sfnt_off00013c8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13C8A 16096 bytes
SHA-256: 9853a4a918762215dfcba51349555ff48d39e56332efe18e2f333ca30d8a5b61

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