Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c9766c64a5171a3…

MALICIOUS

PDF

83.0 KB Created: 2021-03-15 17:28:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: a917319bb7120d481b3e14399ee0d3e2 SHA-1: 14a37b6781f60c590e51e237088c3fa9b002d5a1 SHA-256: 2c9766c64a5171a3c5f5e2dc21028d7fca57a09700e6b5ce1e11add46faa8d90
186 Risk Score

Malware Insights

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

This PDF file was identified as malicious by a machine learning classifier and ClamAV. It contains a large number of external links, many hosted on disposable domains, suggesting a link farm designed to distribute malicious content or phish for information. The document body, though heavily obfuscated, contains references to 'wkhtmltopdf' and a date, indicating it was likely generated programmatically to appear as a legitimate document while serving as a lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9950

Heuristics 6

  • 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 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.
  • 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://druttle.ru/award?keyword=difference+between+dfs+and+bfs+in+artificial+intelligence+pdf PDF link annotation
    • http://zoziwasikow.22web.org/shoprite_bursary_form.pdfIn PDF document text
    • https://rikusinifo.weebly.com/uploads/1/3/4/0/134017093/5079338.pdfIn PDF document text
    • https://lofokuvowuvi.weebly.com/uploads/1/3/4/3/134362742/2eee8779.pdfIn PDF document text
    • https://sizeduxaginota.weebly.com/uploads/1/3/2/7/132712537/kumija-vokezakad.pdfIn PDF document text
    • https://dazuvekojuj.weebly.com/uploads/1/3/4/8/134863877/2023064.pdfIn PDF document text
    • https://nerupeke.weebly.com/uploads/1/3/1/4/131483009/tuxeduberosar.pdfIn PDF document text
    • http://linawoninup.22web.org/46074845609.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://550dfcec-0280-4316-a0d5-68b74a7a20b9.filesusr.com/ugd/f59309_3dd8c4b6d4e34f2ba454fba9557267c7.pdf?index=trueIn PDF document text
    • http://fisazivibutaz.epizy.com/what_is_the_official_order_to_watch_the_marvel_movies.pdfIn PDF document text
    • https://9e730ba1-499c-413e-9a09-8a81f8121270.filesusr.com/ugd/0a0016_9d3c84a467544eb289057eb5aa14e874.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca45bf4b-456a-4ea9-b5ee-cd9895db223c/12247516557.pdfIn PDF document text
    • http://xujogefup.rf.gd/billy_goat_aerator_manual.pdfIn PDF document text
    • http://ninanupazazudad.rf.gd/magic_island_by_cathy_song.pdfIn PDF document text
    • http://lisipuponinel.rf.gd/daziretuserupowidumofame.pdfIn PDF document text
    • https://cccd2283-d272-450a-840b-6541230ebad2.filesusr.com/ugd/5de1df_b45634006fb84dd1af48b321616322cb.pdf?index=trueIn PDF document text
    • http://kezepinaxozegom.epizy.com/13455868559.pdfIn PDF document text
    • https://d1897088-ef6e-4b60-8303-910b4b551fc1.filesusr.com/ugd/4cfbbd_db7752588f334d41a79c4fcc4ee83e6a.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4194adb5-bce7-4bc7-9750-c2167bdc2e70/werusimewizidejuworu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/801c6069-833a-4298-958b-f48f01a4deb5/how_to_resize_plugins_in_fl_studio.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e0d97427-881f-4275-9061-cd68116fb1f3/vapereturikumabemonelu.pdfIn PDF document text
    • https://018ae6bf-5b6e-4bf7-bb5f-89503284f855.filesusr.com/ugd/b7931c_7a85531ab6bc4d5ea925a9ed643213ae.pdf?index=trueIn PDF document text
    • http://kilaliwe.rf.gd/naina_song_free_ankit_tiwari.pdfIn PDF document text
    • https://a540aa65-2eb1-4ac3-86d0-bf6a54daac96.filesusr.com/ugd/2d797c_bf8b20424af3461b9439cdd020883a16.pdf?index=trueIn PDF document text
    • https://0bdb67af-4c57-4a6e-9706-714cc80719f5.filesusr.com/ugd/fc840b_c0a71143475043aa9defdf64eacd8f03.pdf?index=trueIn PDF document text
    • https://7ae52be2-ba3c-41fb-8935-29281088223e.filesusr.com/ugd/affaa6_ce14488b857b46faaa8ace41e3efed31.pdf?index=trueIn PDF document text
    • https://76bf42c0-7447-45ed-8dd3-33f9786ae3ae.filesusr.com/ugd/ba2c19_1dcfeb2b86444961a20e633268d97a08.pdf?index=trueIn PDF document text
    • http://fuwuwiri.rf.gd/dasizalegogadab.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA4A 5232 bytes
SHA-256: f553035cbaa4236f9009216f61cfb77176fe357271cd9e54489e5e8643d3b1f6
font_01_sfnt_off00010c36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C36 10412 bytes
SHA-256: a7341a7caca2a03ab16959e8d7cb4a1f1ad2cbac47ca7f1d82373d1b3ed256fd
font_02_sfnt_off00012fa5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FA5 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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