Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed810c33d9729341…

MALICIOUS

PDF

80.1 KB Created: 2021-04-10 13:11:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: e048bd63fe194fa6f3f7ec2761dba7c9 SHA-1: d9297b4fbd681b1964340c004bd9b0e595231f41 SHA-256: ed810c33d97293413a3757ca7fdd2512e8f1a0ded41877d78d6b38ec990c27d1
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with a critical heuristic identifying it as a PDF link farm. One of the primary URLs, 'https://zajinet.ru/strik?utm_term=what+do+the+coshh+symbols+mean', is flagged as suspicious. The presence of many external links, combined with ClamAV detection and ML classification, strongly suggests a malicious intent to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://zajinet.ru/strik?utm_term=what+do+the+coshh+symbols+mean
    • http://all-gopro.com/seven_spiritual_laws_of_success_audio_downloadyblpq.pdf
    • http://muldwych.com/strategic_management_of_technological_innovation_4th_edition_free_downloadg77cy.pdf
    • https://nidedijuba.weebly.com/uploads/1/3/0/8/130814831/89553.pdf
    • https://lirowutezi.weebly.com/uploads/1/3/4/6/134696369/zudutobozadunetekuja.pdf
    • http://runaxok.iblogger.org/catering_operations_manager_job_description.pdf
    • https://zulufiki.weebly.com/uploads/1/3/4/6/134662959/8496956.pdf
    • http://gelumagiz.iblogger.org/adobe_acrobat_pro_x1.pdf
    • http://testvvd.xyz/lagu_careless_whisper_videovzc2h.pdf
    • https://jetezilim.weebly.com/uploads/1/3/0/7/130775858/rugifepa_rogarutev.pdf
    • https://negozikazaseju.weebly.com/uploads/1/3/4/5/134587396/e56b08c0b7.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/b5b85fc4-c4eb-432e-9749-479bcab7ab8d/soduvizut.pdf
    • https://uploads.strikinglycdn.com/files/1f2a974d-cd10-4f86-b125-f159dbc72831/netatmo_weather_station_factory_reset.pdf
    • http://rukukuwozar.epizy.com/runawowemulalilotilozama.pdf
    • https://f13dd0f9-fe0a-4257-a88d-d9af1a1cf0e3.filesusr.com/ugd/d954c5_d53895d86ad24d3b8affd1da3c275420.pdf?index=true
    • https://uploads.strikinglycdn.com/files/1fdf1b04-6b58-4642-9bfe-b5916a72bc39/a_dolls_house_character_analysis.pdf
    • https://3c1efe6f-6e34-41bb-a2c4-2be85dd3cb33.filesusr.com/ugd/41f880_102b2fa395ae4ae38861131ac9930405.pdf?index=true
    • https://11ca5eb4-0abe-4d5d-8073-3f36f6088e80.filesusr.com/ugd/8b62d8_ec5bc564c53a468ba6207d40fc2f0cd8.pdf?index=true
    • https://fb3efafe-1b0e-41a1-9434-8bf556110c4a.filesusr.com/ugd/de5e41_827860e2c92e4f8f800e77cf3ae52157.pdf?index=true
    • https://uploads.strikinglycdn.com/files/44d8637f-9189-499e-a2a8-311c2a9c6c1f/what_do_you_mean_by_sports_psychology.pdf
    • https://uploads.strikinglycdn.com/files/a378b70a-b707-4e5b-a40f-27d6b00ce6b5/gimp_fonts_download_free.pdf
    • https://65f7c47b-6fa2-4aed-9649-637438a88329.filesusr.com/ugd/8fb471_1c42edbe9e7f427a92bc020532f3d338.pdf?index=true
    • https://uploads.strikinglycdn.com/files/5ea519a1-95f6-4c85-93ac-3dcaa6606723/cfa_level_1_june_2020_curriculum.pdf
    • https://uploads.strikinglycdn.com/files/02233988-bd7a-42b2-be7b-a4351b1a62ee/2005_yamaha_yfz_450_carb_problems.pdf
    • https://uploads.strikinglycdn.com/files/a35e307b-b6fa-40d7-944a-9ee5f9c2c652/how_to_speed_up_an_edpuzzle.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_off0000f8e8.bin
2c2ca04d4e05449e84edb059c8bd1f6de2691e6fa00932eca7133584f7206fab		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF8E8 5336 bytes
font_01_sfnt_off00010afc.bin
7309ae858b1a5ff809c1688acaa1ced24d8cf20e3b7340db760fa613a7bca575		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10AFC 11300 bytes

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