Malicious PDF — malware analysis report

Static analysis result for SHA-256 c77dca6c80a1200f…

MALICIOUS

PDF

82.0 KB Created: 2021-03-23 22:25:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: cd41e2d81aa310e25bba0ae32d38734e SHA-1: 7004aa500f9beb681c8afd7478bfc1da3c7b8c04 SHA-256: c77dca6c80a1200fa74dd5354d2b45e8c647a482f8a5b818a804daba9a279a6a
126 Risk Score

Malware Insights

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

The sample is identified as malicious by ClamAV and an ML classifier, with a high-risk score. It contains an external URI pointing to 'kuzutuzo.ru', which is flagged as a link farm on disposable hosting. While no scripts were explicitly extracted, the PDF structure and the nature of the heuristics suggest it's designed to redirect users to malicious content, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://kuzutuzo.ru/strik?utm_term=pit+and+the+pendulum+character+traits
    • http://pemufosapakem.mypressonline.com/dunkin_donuts_coffee_calories_cream_and_sugar.pdf
    • https://cdn-cms.f-static.net/uploads/4392659/normal_600cf3dcd780d.pdf
    • http://wivikaxebox.medianewsonline.com/abandon_all_hope_rpg.pdf
    • https://cdn-cms.f-static.net/uploads/4402963/normal_6023f7ecee8e7.pdf
    • https://static.s123-cdn-static.com/uploads/4416327/normal_5ff9595b0b5c6.pdf
    • http://kigumelez.medianewsonline.com/logical_and_reasoning_questions.pdf
    • http://wipunemobak.mygamesonline.org/how_to_reset_a_netgear_switch.pdf
    • https://cdn-cms.f-static.net/uploads/4407781/normal_602c579816b50.pdf
    • http://mavogevuz.getenjoyment.net/nixozexanosegazulelaf.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/natewared/what_are_the_signal_words_that_convey_facts_from_opinion.pdf
    • http://rowoniwetob.atwebpages.com/common_interview_questions_for_teachers_and_how_to_answer.pdf
    • https://uploads.strikinglycdn.com/files/a1a59240-eaf8-43d5-8f82-a94f72c9047e/metal_gear_solid_v_special_edition_ps4.pdf
    • http://tevefetilojas.atwebpages.com/81942531192.pdf
    • http://lesidiwajenowil.myartsonline.com/baligelodonuxaru.pdf
    • https://s3.amazonaws.com/lovomijelun/zopolukavulevixapa.pdf
    • https://uploads.strikinglycdn.com/files/cebc68b2-f7ca-44b7-b53c-288143c81b54/how_long_to_study_for_medical_assistant.pdf
    • http://penanaras.myartsonline.com/diagrama_hombre_maquina_ejemplo_resuelto.pdf
    • https://s3.amazonaws.com/vipuxafol/waniriwekojuwexomu.pdf
    • https://uploads.strikinglycdn.com/files/a8aaa372-9c6f-4e7d-91e6-a54e5e3e24bb/how_to_change_time_on_g_shock_5081.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_off00010501.bin
90556732c0b806d1b57845bfd227b65cdf3beafba5db261e8447bc465a80a598		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10501 5312 bytes
font_01_sfnt_off000116e2.bin
6c83dd3917d75312820105a9ae804309810ad5fcbeef97affe8b691e1c0526b5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x116E2 10612 bytes

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