Malicious PDF — malware analysis report

Static analysis result for SHA-256 9ae4ff53ec78165d…

MALICIOUS

PDF

77.2 KB Created: 2021-06-11 06:56:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c2f9512144d06d2a4ea2a61d9f582280 SHA-1: 9abe24fb6672354de8bda48a7fbc2a36d7112eba SHA-256: 9ae4ff53ec78165d9735476c7e6064d39ff29788bb3e3ea00c0be4cb8ff9ded4
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable hosting and exhibiting link farm characteristics, strongly suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection confirm the malicious nature of the file. While no scripts were explicitly extracted, the PDF structure and embedded links indicate an attempt to redirect users to malicious content.

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://ketchas.ru/pbw?utm_term=custom+license+plate+gta+5+online
    • https://golakabuzoved.weebly.com/uploads/1/3/4/8/134870140/kokarinejaz.pdf
    • https://movimuwetimegi.weebly.com/uploads/1/3/4/3/134342740/6087288.pdf
    • https://cdn-cms.f-static.net/uploads/4387581/normal_5fd99fc4323d3.pdf
    • https://static.s123-cdn-static.com/uploads/4459628/normal_5fca74a7c1d28.pdf
    • https://wutiduxa.weebly.com/uploads/1/3/5/3/135300785/b1a05a.pdf
    • https://vedalamiru.weebly.com/uploads/1/3/0/7/130776143/kususuror.pdf
    • https://cdn-cms.f-static.net/uploads/4384469/normal_606e5cf57e0be.pdf
    • https://sararilaba.weebly.com/uploads/1/3/1/4/131482808/3297473b3.pdf
    • https://cdn-cms.f-static.net/uploads/4459174/normal_600f989625a00.pdf
    • https://togazozaxezux.weebly.com/uploads/1/3/1/6/131606461/7466266.pdf
    • https://tutiwelureno.weebly.com/uploads/1/3/4/7/134714557/f51ee.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://jizakatum.pbworks.com/w/file/fetch/144637740/flight_movie_dual_audio_480p.pdf
    • http://duziruromeja.pbworks.com/w/file/fetch/144489177/can_i_connect_a_bluetooth_speaker_to_my_echo_dot.pdf
    • https://uploads.strikinglycdn.com/files/f19925c1-9e3d-467c-83eb-14752b7fcf0b/19843285072.pdf
    • https://uploads.strikinglycdn.com/files/ebd313b7-450f-4d1e-9d02-7a4856c055a9/nalc_pay_scale_2014.pdf
    • http://sekodegaxex.pbworks.com/f/essay_on_my_favourite_food_for_class_3.pdf
    • http://kelivesas.pbworks.com/w/file/fetch/144442122/how_much_oil_does_a_16_hp_briggs_and_stratton_engine_hold.pdf
    • https://uploads.strikinglycdn.com/files/e7f18145-fecb-450d-8e68-ea062e8dc8f8/microsoft_universal_mobile_keyboard_instructions.pdf
    • http://rasetewi.pbworks.com/f/komik_naruhina_bahasa_indonesia.pdf
    • http://lokifasowaso.pbworks.com/w/file/fetch/144956271/tekken_tag_tournament_2_pc_torrent.pdf
    • http://momoruxoxim.pbworks.com/w/file/fetch/144776544/midnight_castle_cheats_2018.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_off0000f2a1.bin
ba1f12bd1c6fa8cb51d4a740e88e33971a59c6a3da577c8783ffdcfa21223eaf		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF2A1 5184 bytes
font_01_sfnt_off0001043b.bin
914eb45bc3045800370fc020ffbc15b9d5a6d2a6947b8d81934fdead549aa174		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1043B 10204 bytes

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