Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21f9bec161da070…

MALICIOUS

PDF

77.7 KB Created: 2021-03-16 01:51:27 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 8812acf16816ba03848082521400333e SHA-1: 8086874c8af78e4f38090628779518df807c6dc7 SHA-256: f21f9bec161da070b7244398fcd38c6ee2a2ca08ad8c63659d3dff9b18b6f5ac
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://midufefew.ru/123?utm_term=excel+xml+spreadsheet+extension PDF link annotation
    • http://migriruy.ru/bejeweled_3_android_apkgl382.pdfIn PDF document text
    • http://smeshnoykir.space/clipper_guide_combsy5ez8.pdfIn PDF document text
    • http://saudiautoinsurance.com/85282679246lhuin.pdfIn PDF document text
    • http://fruit-italy.space/islands_in_the_stream_song_downloadceykr.pdfIn PDF document text
    • http://it50off.pro/sejuwodajisixixyzjz.pdfIn PDF document text
    • http://creampiepow.club/koxenumopemijiburapagl900j.pdfIn PDF document text
    • http://stassikorskyi.com/lumomokupipukojejadav2eqtp.pdfIn PDF document text
    • http://postel-na-zakaz.ru/sub_zero_642_door_gasket5bqf8.pdfIn PDF document text
    • http://testersairf.xyz/denejotozofolexrvyts.pdfIn PDF document text
    • http://pet-guru.shop/sofikaz94va.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/d35ecac2-aeb9-4ada-a3ed-0d64dd6f38eb/trig_functions_worksheet_answer_key.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bc91554a-daae-454f-bd40-8669fa519830/viper_7145v_remote_case.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9e03d80-661a-4b7d-9f83-bade6e3deb25/the_crown_season_1_episode_1_full_episode.pdfIn PDF document text
    • http://xofaxisenulomav.epizy.com/how_much_does_miner_make.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e03e2d58-19a9-42c4-ab08-13aab8239415/2014_lexus_rx_350_hybrid_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/141fc2ed-71b3-46de-b6af-d2941bacfbae/what_is_the_best_fitness_equipment_for_home.pdfIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/machine_learning_interview_questions_and_answers.pdfIn PDF document text
    • http://potelodifudoduj.epizy.com/black_desert_online_remastered_free.pdfIn PDF document text
    • https://s3.amazonaws.com/xukonakefules/xobab.pdfIn PDF document text
    • http://zunuwovadete.epizy.com/ap_calculus_bc_logistic_growth_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/65317acd-ce10-4966-904d-fd4868130446/1121398306.pdfIn PDF document text
    • https://s3.amazonaws.com/bidemewufa/kiladilenezozop.pdfIn PDF document text
    • https://s3.amazonaws.com/rodigapigeta/nisubowefulikozaxezez.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/75ba5c2a-c9b6-49e4-aa28-93ecc8734d4c/3511666508.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_off0000d6fa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6FA 8936 bytes
SHA-256: b5ab03095404e294a5b6b7b204631d1224b81009b3115231e33f88bb8455fb74
font_01_sfnt_off0000f528.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF528 5340 bytes
SHA-256: c89fe71d0c1020f619cda64867d395ed96f5b72bac376a98b3d766329dd0be35
font_02_sfnt_off00010723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10723 9900 bytes
SHA-256: ad1e8b06a90da50422fce49ac8061243e6a41bec92db69600e838b26ec2ea16b

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