Malicious PDF — malware analysis report

Static analysis result for SHA-256 df8a674900c668d7…

MALICIOUS

PDF

86.8 KB Created: 2021-03-13 20:06:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 406d52baaa00e39c9026364ba9b114a3 SHA-1: 6ab258afe2cda4ba11bcc25c9a8219bf29ae86d4 SHA-256: df8a674900c668d7f7cd22ba1e9fba2fe9ee5c5652bd6f25358dca5dcd9ea587
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 0.9996

Heuristics 6

  • 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 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://mezovuduw.ru/123?utm_term=android+example+sync+adapter+tutorial PDF link annotation
    • https://rorefogalo.weebly.com/uploads/1/3/0/7/130776605/525065.pdfIn PDF document text
    • https://cdn.sqhk.co/tuxarulenogu/izdhbgi/bird_vs_zombie.pdfIn PDF document text
    • https://cdn.sqhk.co/delopomixaba/ijfRhje/10691895061.pdfIn PDF document text
    • https://cdn.sqhk.co/xamitarerivu/jgaVifn/vosolekotagelewilowum.pdfIn PDF document text
    • https://cdn.sqhk.co/janawezexoj/eghifLE/best_tiktok_filters_for_brown_eyes.pdfIn PDF document text
    • https://cdn.sqhk.co/vovawumusa/iOUihjd/final_blades_of_chaos_upgrade.pdfIn PDF document text
    • https://juwufugoxeza.weebly.com/uploads/1/3/4/5/134528381/37373b16d0.pdfIn PDF document text
    • http://xevamoz.mygamesonline.org/siwitup.pdfIn PDF document text
    • https://cdn.sqhk.co/tatidukigag/gen8srx/99995343900.pdfIn PDF document text
    • https://nizevamil.weebly.com/uploads/1/3/2/8/132814567/7805300.pdfIn PDF document text
    • https://cdn.sqhk.co/fidapulano/giibxEY/memazuxiwunesedeti.pdfIn PDF document text
    • https://folutiniku.weebly.com/uploads/1/3/1/8/131871586/2976068.pdfIn PDF document text
    • https://cdn.sqhk.co/noperizapewo/liahggd/carrom_super_multiplayer_carrom_board_game.pdfIn PDF document text
    • https://cdn.sqhk.co/zovitamojim/dhgaie5/nukunifofunovojewupixaf.pdfIn PDF document text
    • https://cdn.sqhk.co/jamasedese/d9v5aPm/worlds_hardest_game_unblocked_3.pdfIn PDF document text
    • https://cdn.sqhk.co/ratufewebu/giRSAK1/zobokijogezudisotuzerodo.pdfIn PDF document text
    • https://cdn.sqhk.co/lexijunibul/Pgejhjc/free_video_slots_games_no_download.pdfIn PDF document text
    • http://jedomagisuw.getenjoyment.net/rosudajiboxatokuwiritex.pdfIn PDF document text
    • https://cdn.sqhk.co/linigurep/iiiiGhc/total_quality_management_textbook_mcgraw_hill.pdfIn PDF document text
    • http://nakozek.mypressonline.com/d_d_3._5_complete_arcane.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/46461f3b-c13f-4a28-b718-0df76fa2307b/mezupusosaxokowozojidazaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e9411dd8-089d-4b6c-9043-c3a599c8721b/sql_books_2020.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_off000115e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x115E0 5380 bytes
SHA-256: ff7cb8a1dae30c28239cf5e661ccc33199791a5e6611955d0674fade7fda7445
font_01_sfnt_off00012822.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12822 11024 bytes
SHA-256: 89eb853593ecf4171e7e6791902498c229ad9f06bd23a8e826bc0352a48ed7a9

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