Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d08f1420d8bc096…

MALICIOUS

PDF

77.8 KB Created: 2021-03-26 07:40:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5a6f70621ba020370fdc4ae2506a2bce SHA-1: 6efcffb42208f533505b25c7dead90a76da75b23 SHA-256: 5d08f1420d8bc096398f2559a16dd3d1eb78eb07acfe0c158e3cbb07a0d1b332
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics as a link farm, containing numerous external links to potentially malicious or phishing sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to malicious content, likely as part of a phishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9990

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://zajinet.ru/strik?utm_term=orion+cooker+ribs+time PDF link annotation
    • https://cdn.sqhk.co/wafifovuwel/d61jde4/risk_assessment_example_project.pdfIn PDF document text
    • https://cdn.sqhk.co/viwedanej/jghjdjf/japezo.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/hf7jjRo/84464914190.pdfIn PDF document text
    • https://bifugojatomawak.weebly.com/uploads/1/3/1/4/131437093/e511d5808e4a6d7.pdfIn PDF document text
    • https://cdn.sqhk.co/pigajifaw/ijiiOn1/buggy_rc_car_batteries.pdfIn PDF document text
    • https://cdn.sqhk.co/jokawefezo/qiiieje/abcmouse_free_login.pdfIn PDF document text
    • https://cdn.sqhk.co/vekosozob/gjihijs/rovupipilosoxotigusuzifol.pdfIn PDF document text
    • https://cdn.sqhk.co/mebinolopuf/llS2Roy/electrical_and_computer_engineering_osu_bingo_sheet.pdfIn PDF document text
    • https://vuzevarezevarot.weebly.com/uploads/1/3/0/7/130740461/zimejo-mubasodesogel-lopad-reditilex.pdfIn PDF document text
    • https://cdn.sqhk.co/silinetufid/ieijNlv/83032354832.pdfIn PDF document text
    • http://bijukexamova.scienceontheweb.net/the_way_of_the_psychonaut.pdfIn PDF document text
    • https://cdn.sqhk.co/suzeboxiwo/dcSEqGp/50750212765.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/2622530.pdfIn PDF document text
    • https://cdn.sqhk.co/zafowavo/djfhbhf/crazy_eights_card_game_cool_math_games.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/05f65408-e810-43c7-b445-ec46fa84c9d0/kelezamuxit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/989f4f4b-68e1-48cc-8a27-5860f8a262f2/8872955876.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eb38ec7-06dc-4664-a701-622dceda5e5f/58161057198.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cd09ad15-559d-4994-9045-648e99b0d7eb/external_speakers_not_showing_in_playback_devices_windows_7.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3104e423-b6a0-42d5-aedf-f79765a1037d/integrated_chinese_workbook_answer_key_level_1_part_1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d742fd96-820d-41e1-8596-3b4e53675397/tomogutugogunuxapoxezuxir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1836b6d7-4d7b-4d03-89e7-3579a5a97c8e/is_procreate_hard_to_use.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e6adebe7-24cf-44d3-8ab2-761060f4b50d/blue_collar_brilliance_mike_rose_analysis.pdfIn PDF document text
    • http://zozupajekuledus.myartsonline.com/average_velocity_and_instantaneous_velocity.pdfIn PDF document text
    • http://tikomiwewo.atwebpages.com/basic_life_support_chart.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/38604123-6141-4508-bcb9-a3cfb89acd1e/16816190768.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f150.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF150 4936 bytes
SHA-256: 77587ad4b2c6211768ef4b862679070dbaba4a1d983d5a4d0d0c6af1d717fd29
font_01_sfnt_off0001020a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1020A 11032 bytes
SHA-256: ebf1fd90b70d78890e7ae32c432e997aec23287d137b28c19c6ef0ff1cfe7e4c

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