Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dcb44506cfcbb09…

MALICIOUS

PDF

76.8 KB Created: 2021-03-27 10:54:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 9f96bd3b6809e342ba020110b091bceb SHA-1: 1100131ab94e5efff514d60a97dd318546a85fd6 SHA-256: 6dcb44506cfcbb097cdc641345aff3b36d29079c5443ef66e985dc38390742d6
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 0.9996

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://jacksth.ru/123?utm_term=cdc+influenza+report+map PDF link annotation
    • http://uscreditreport.info/glg_balanced_managed_fund_fact_sheetqb7qm.pdfIn PDF document text
    • http://xijipeva.mypressonline.com/autismo_infantil_2020.pdfIn PDF document text
    • http://tixshopclub.fun/aggiornamento_windows_7_a_windows_10dv5b2.pdfIn PDF document text
    • http://borejukeluteva.mygamesonline.org/yaskawa_a1000_manual_free_download.pdfIn PDF document text
    • http://dipunag.getenjoyment.net/ableitungsregeln_e_funktion.pdfIn PDF document text
    • http://pop-marketplace.ru/transformers_rescue_bots_disaster_dash_apk_mod1lj5p.pdfIn PDF document text
    • http://ctuxuu.com/pdf_file_voice_reader_for_pc9bra1.pdfIn PDF document text
    • https://cdn.sqhk.co/mekekomubun/ihiiwSZ/vawekobofenuvusavipuk.pdfIn PDF document text
    • http://defokozixeral.sportsontheweb.net/paris_bus_map_with_streets.pdfIn PDF document text
    • http://nupesupo.mypressonline.com/60355111091.pdfIn PDF document text
    • http://alkostore.xyz/29093241599ixyzr.pdfIn PDF document text
    • http://rafale.store/vex_robotics_programming_examplesen94j.pdfIn PDF document text
    • http://kernig.online/levuvetb00q2.pdfIn PDF document text
    • https://cdn.sqhk.co/wekaradukuve/OjdhAHM/lijedunukemuwaras.pdfIn PDF document text
    • https://cdn.sqhk.co/neviragar/ZhbxHKW/missing_link_berkeley_hours.pdfIn PDF document text
    • http://benivosefemiza.medianewsonline.com/87178250956.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/wanasuvedigo/riwelobakevezaxodekoje.pdfIn PDF document text
    • http://nowageg.onlinewebshop.net/advanced_vocabulary_words_and_definitions.pdfIn PDF document text
    • http://pejemevogoge.myartsonline.com/cambridge_latin_book_2.pdfIn PDF document text
    • https://s3.amazonaws.com/pisedij/90168130826.pdfIn PDF document text
    • https://s3.amazonaws.com/mozedijiz/felunabenegigikabovajire.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_off0000ef57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF57 5080 bytes
SHA-256: e3a687a35b36a3f5bbd562270e2bb50525ac5f9844bf1d0e9a2d64427ed0dea9
font_01_sfnt_off00010090.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10090 11124 bytes
SHA-256: 95b23c7d089f85a97c4f7915e488d5e8eb99531d89acdfdfe22892d008050417

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