Malicious PDF — malware analysis report

Static analysis result for SHA-256 45c96aacdf3484ec…

MALICIOUS

PDF

68.2 KB Created: 2021-09-24 21:11:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 7e678f10c8199bc82f4c4c6d0ed48543 SHA-1: 6843414e7f425529a10b99dffc19771a7675ed4e SHA-256: 45c96aacdf3484ecc8d839de60fa1c1ac1fe2aa507ca973ba2c1757efe8133f0
126 Risk Score

Malware Insights

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

The sample was detected as a malicious PDF by multiple heuristics and an ML classifier. It contains numerous embedded URLs pointing to external domains, suggesting a phishing or malware distribution scheme. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a large number of links on disposable hosting, further supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://garglob.ru/uplcv?utm_term=imovie+apk+android+download PDF link annotation
    • http://jimsclub.net/new/board/img_tinfo/file/20210916015802.pdfIn PDF document text
    • http://firegallery.ru/img/upload/43217851062.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/lewixudorodurerete.pdfIn PDF document text
    • http://020tzs.com/baige/images/userfiles/file/56975448872.pdfIn PDF document text
    • https://zibarajabi.com/cache/fck_files/file/wopopowikodot.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/libinugi.pdfIn PDF document text
    • http://diagnosticaedilizia.com/userfiles/files/terowuxibipiduwufukikusad.pdfIn PDF document text
    • https://minhvuongthuphap.com/upload/ck/files/zamarawojomepaduse.pdfIn PDF document text
    • https://ms01bet.com/contents/files/luzasudemipi.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/pigopibutarun.pdfIn PDF document text
    • https://demoliman-host168-com.twbiz.me/data/html_editor/files/sinizusisudo.pdfIn PDF document text
    • http://ekbdrive.ru/ckfinder/userfiles/files/wotitivazepabido.pdfIn PDF document text
    • http://keitbg.com/images/files/12956181814.pdfIn PDF document text
    • http://pibar.tw/uploads/files/202109130141491143.pdfIn PDF document text
    • http://thementalhealthadvocates.org/files/userfiles/file/pewanubafivi.pdfIn PDF document text
    • http://studio-orlandini.com/userfiles/files/kupujepo.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/24483301062.pdfIn PDF document text
    • https://pgp-puh.hr/fck_media/file/naguneku.pdfIn PDF document text
    • https://optimumquestsolutions.com/ckfinder/userfiles/files/nowene.pdfIn PDF document text
    • http://thedreams.cz/files/47009048047.pdfIn PDF document text
    • http://kalikraft.com/images/file/52826759868.pdfIn PDF document text
    • https://gz-topstar.com/wp-content/plugins/super-forms/uploads/php/files/1aa50ad933ec4ad15e762d90ad8c6830/dobuzarepuka.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/29570271987.pdfIn PDF document text
    • https://creativenursery.net/home/creative/public_html/ckfinder/userfiles/files/62673572206.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

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae8e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE8E 10484 bytes
SHA-256: c0f8352e37f49e1219f439754172d117bc0c830865c99f01debca93172dde5f2
font_01_sfnt_off0000c64c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC64C 14772 bytes
SHA-256: d09123fd0cdb4f309162f0628614220e53e028a63d076fa1976f6fc8443fcb5b
font_02_sfnt_off0000eb34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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