Malicious PDF — malware analysis report

Static analysis result for SHA-256 331440f4b0945987…

MALICIOUS

PDF

99.4 KB Created: 2021-03-25 00:11:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: 4e81a6b4b3fb7e03bbe3ab0a975206ab SHA-1: 5105c03c7c6161059fa53f44fafd79fed7d4fce3 SHA-256: 331440f4b0945987f82a9dc5c5a320a0a3d6c85d0648819c09847e584668b686
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 0.9992

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://resalured.ru/wix?keyword=ghostfreak+ben+10 PDF link annotation
    • http://50offstore.pro/coinium_isotopes_of_atoms_answershrjlq.pdfIn PDF document text
    • http://milansit.space/hp_blackberry_android_2019dst8e.pdfIn PDF document text
    • http://rixorevu.getenjoyment.net/famuvo.pdfIn PDF document text
    • https://cdn.sqhk.co/zirizowesaw/cuszihJ/world_cup_1990_qualifying_concacaf.pdfIn PDF document text
    • http://tiwimifozukimu.medianewsonline.com/88630358355.pdfIn PDF document text
    • http://guitar.su/231562887376ywbz.pdfIn PDF document text
    • https://cdn.sqhk.co/gugosobor/cvFT9pV/best_movies_2018_rotten_tomatoes.pdfIn PDF document text
    • http://masalev.ru/lesodezebekudokiwafufawo5dcb.pdfIn PDF document text
    • http://rubyshup.space/sekerajofaxamewitu9r0th.pdfIn PDF document text
    • https://lafevisok.weebly.com/uploads/1/3/2/6/132683062/wozisotibizu-bipabazisura-vukatibexixul.pdfIn PDF document text
    • http://lipuwisapi.mywebcommunity.org/jevudowu.pdfIn PDF document text
    • https://cdn.sqhk.co/wajidafix/VGt6S1t/61047369639.pdfIn PDF document text
    • https://molukubiluvu.weebly.com/uploads/1/3/1/4/131453067/toporukezitomomen.pdfIn PDF document text
    • https://cdn.sqhk.co/rotonoba/x9hjjcM/xuzaxifajes.pdfIn PDF document text
    • https://povoxiguda.weebly.com/uploads/1/3/4/0/134016665/441e6978.pdfIn PDF document text
    • https://sedezexe.weebly.com/uploads/1/3/4/3/134342112/701054.pdfIn PDF document text
    • http://xutifufaxe.mypressonline.com/code_de_la_route_aux_etats_unis.pdfIn PDF document text
    • https://cdn.sqhk.co/zadoweferoxe/eOlUaic/cute_maltipoo_puppies_for_sale_near_me.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sivikonalijuto.myartsonline.com/risk_assessment_form_iosh.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6cc6ff9f-721c-43fe-8763-03274f03aff8/what_to_do_when_your_printer_cartridge_is_jammed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a9b3558-55e1-4465-adbd-4db115f068a0/namalefoburudiv.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off00016538.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x16538 17180 bytes
SHA-256: e1ccff5723f55e9fffbfcd3fea34b0660d62f4621e5a6656e9d6d4cd654e0aeb
font_00_sfnt_off000111c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C7 4952 bytes
SHA-256: dde88f9d93b9cead6d59c21dad584228e3be6314badd1b1c8ae061156f1c0a2b
font_01_sfnt_off00012351.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12351 5252 bytes
SHA-256: 2bf978fe934ef2c3121492db37849297b5123bf57d53b476eee5a8249ef49018
font_02_sfnt_off0001352c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1352C 15484 bytes
SHA-256: 3d00a2bed19913463676f51f91e242f4c8e654012ced31753dab57a7959f423e