Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d3903df41778297…

MALICIOUS

PDF

78.5 KB Created: 2021-03-20 12:25:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fdfe87bec831e90c86461f1a78c30591 SHA-1: b754b7d9f6eb1556dbad74546398ab274e10aa8b SHA-256: 8d3903df4177829728d4a25cbfe3f03acb09753252bac332342543e2d7f7505c
126 Risk Score

Malware Insights

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

The PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one prominent URL pointing to 'kuzutuzo.ru/strik', suggesting a phishing or malicious redirection attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is designed to host many links on disposable domains, reinforcing the malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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 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://kuzutuzo.ru/strik?utm_term=words+that+begin+with+d+to+describe+someone
    • https://kitivagep.weebly.com/uploads/1/3/0/7/130775950/9838101.pdf
    • http://kefudepoduwudi.sportsontheweb.net/12768500015.pdf
    • https://betutoza.weebly.com/uploads/1/3/4/8/134899773/worevowagilizo.pdf
    • http://kugewezebuvigiw.mygamesonline.org/how_to_make_money_in_gta_5_online_hack.pdf
    • http://vaxiliwu.medianewsonline.com/35418298079.pdf
    • http://miribut.mywebcommunity.org/how_to_draw_parallel_and_perpendicular_lines_using_set_squares.pdf
    • http://legegapepapo.medianewsonline.com/telugu_vowels_and_consonants.pdf
    • http://balegetiwep.mywebcommunity.org/30216016362.pdf
    • http://baditunabupiru.mywebcommunity.org/1429958653.pdf
    • https://pixasowurixes.weebly.com/uploads/1/3/4/9/134904492/0b6cc.pdf
    • https://kokonasaza.weebly.com/uploads/1/3/1/6/131636703/5217982.pdf
    • http://pofuxubilet.sportsontheweb.net/worksheet_11_adding_and_subtracting_mixed_numbers_answer_key.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bexovivuvere.myartsonline.com/how_to_use_porter_cable_dovetail_jig_4216.pdf
    • http://bumurulepowele.myartsonline.com/39736845900.pdf
    • https://uploads.strikinglycdn.com/files/d4429088-4b45-4172-a6e4-8f12521c76de/como_saber_que_tipo_de_archivo_es_linux.pdf
    • https://uploads.strikinglycdn.com/files/efde6702-43db-458c-be19-9f0b6244ab3b/bluebook_press_release.pdf
    • http://pabotojixupi.atwebpages.com/bekalan_air_and_malaysia.pdf
    • https://uploads.strikinglycdn.com/files/94f20ce0-7585-4bf0-9028-12fd6692b7f7/graco_magnum_x5_trueairless_paint_sprayer_manual.pdf
    • http://titugol.atwebpages.com/zifuwe.pdf
    • http://xepatodop.onlinewebshop.net/46143710289.pdf
    • http://xomutojekes.myartsonline.com/exam_essentials_cae_practice_tests_2020.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_off0000f419.bin
f0d39fcce7adc75fa147b4b20c585b9b69167e1bbcbd411b13e58fa80a616029		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF419 5568 bytes
font_01_sfnt_off000106f4.bin
05c654e95f1cc7f215e65a415bb27bc34457c2b4274b63ff1b43b6372a54041e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x106F4 11000 bytes

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