Malicious PDF — malware analysis report

Static analysis result for SHA-256 8287e975ab46f45d…

MALICIOUS

PDF

107.3 KB Created: 2021-03-10 22:30:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e9e1c55f205b2dba8f37c3cca7107ba5 SHA-1: 53bc8d9bbcaa22765d94c48610a3549bc34d4505 SHA-256: 8287e975ab46f45d80ca38d8669e0c3a78ed25041caf0d16314a82780109c4f2
126 Risk Score

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 0.9982

Heuristics 5

  • 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 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://dafemum.ru/123?utm_term=guidelines+asymptomatic+bacteriuria PDF link annotation
    • https://cdn.sqhk.co/perigupa/MxYifjd/75714181817.pdfIn PDF document text
    • https://cdn.sqhk.co/tatolodam/9hegjAQ/let_me_speak_to_your_manager_dog_meme.pdfIn PDF document text
    • https://cdn.sqhk.co/wodabumamuv/hghaFgi/afk_arena_best_heroes_late_game.pdfIn PDF document text
    • http://gigurokubi.66ghz.com/free_indesign_recipe_book_templates.pdfIn PDF document text
    • https://cdn.sqhk.co/dirotiweze/iaiavgQ/analyze_x_followers_analytics_for_instagram_mobile_x.pdfIn PDF document text
    • https://cdn.sqhk.co/tixukiko/ak1gUN1/metinixividapewogapul.pdfIn PDF document text
    • https://cdn.sqhk.co/mumesimasozo/aJrih0I/wodogebofimagefisereme.pdfIn PDF document text
    • https://cdn.sqhk.co/wijanotunam/ibjchce/hollywood_movies_escape_plan.pdfIn PDF document text
    • https://cdn.sqhk.co/kewudomavave/ghekWhc/labive.pdfIn PDF document text
    • http://raxawevamavox.getenjoyment.net/bugupoborugadapi.pdfIn PDF document text
    • http://dewisazovuvoxi.mywebcommunity.org/dremel_multipro_model_395_manual.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://s3.amazonaws.com/kukupunopedon/navevutov.pdfIn PDF document text
    • http://zasogiw.epizy.com/can_u_play_rock_band_4_with_a_controller.pdfIn PDF document text
    • https://s3.amazonaws.com/lorugipopuxe/susorakijovotudemuko.pdfIn PDF document text
    • http://womogesupepup.epizy.com/zugijaj.pdfIn PDF document text
    • https://s3.amazonaws.com/farezelof/49855042000.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fe183260-1a5c-4407-b27d-c2dc6991b8eb/xusekuk.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/17364872972.pdfIn PDF document text
    • http://muweluboxakok.rf.gd/42480907760.pdfIn PDF document text
    • http://zapidijerazavot.epizy.com/odia_shayari_video_full_hd.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/instant_card_issuance_guidelines.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1cab8b23-3ffd-480b-a559-9667d75b4f55/42397957814.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6d301c7f-2e03-43b5-aca7-5b3e6c242130/tugukunolexofuxejirerexal.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000143bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143BC 5372 bytes
SHA-256: 536470c13134b035786081736feddfc9d6aeb59f120a0da65d128222fafc4d80
font_01_sfnt_off000155e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x155E4 11216 bytes
SHA-256: 53af8ad31e9e61edb8477c379eee6526d45a8a552e5df8625715e56d79a653ac
font_02_sfnt_off00017bd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17BD3 16208 bytes
SHA-256: 0cd0eab800277383a7922318e7efdaccfecf600f4ff02f050294dc7ce85fe8a9
font_03_sfnt_off00019112.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19112 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3