Malicious PDF — malware analysis report

Static analysis result for SHA-256 667e16db0c5ba60c…

MALICIOUS

PDF

76.6 KB Created: 2021-04-18 23:47:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: b1d08af7ef36bf02d75b9e5572b16b31 SHA-1: 92f996ea897165a6761faa5d8aaaee81ee0811d9 SHA-256: 667e16db0c5ba60cfb500c437381ec35f6a7b88d96d4ba1a6bf12e1e2b05147c
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains multiple embedded URLs, with one pointing to 'xezojetit.ru' and a query parameter suggesting a lure related to clipper blades. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, and ClamAV detected it as 'Pdf.Phishing.Trojan'. The ML classifier also flagged it with high confidence. No scripts were extracted, but the presence of numerous external links and the phishing/trojan detection strongly suggest a malicious intent to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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://xezojetit.ru/strik?utm_term=how+to+change+blade+on+oster+golden+a5+clippers PDF link annotation
    • https://cdn.sqhk.co/dijowasedop/UiaBhdz/tufamevimazusomupo.pdfIn PDF document text
    • https://cdn.sqhk.co/petebeki/ad66tmB/33555291295.pdfIn PDF document text
    • https://cdn.sqhk.co/dudugetogi/YBAjbUf/zikipomaza.pdfIn PDF document text
    • https://cdn.sqhk.co/vefapatape/ibmijZB/13818903878.pdfIn PDF document text
    • https://cdn.sqhk.co/wemegofuk/Ihgiahb/jixezinufunowes.pdfIn PDF document text
    • https://cdn.sqhk.co/fazovivum/055utcC/67929002414.pdfIn PDF document text
    • https://cdn.sqhk.co/pesasotiro/cGsjl45/98476561961.pdfIn PDF document text
    • http://ganoget.scienceontheweb.net/oxford_arabic_dictionary.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369665/normal_6054b24c06e4b.pdfIn PDF document text
    • http://sevezor.scienceontheweb.net/73428939374.pdfIn PDF document text
    • https://cdn.sqhk.co/digodidazo/g0xEjbI/wrestling_world_news_wwe_aew_smackdown_pro.pdfIn PDF document text
    • http://gufurebu.medianewsonline.com/2013_john_deere_d140_specs.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/jcz2Z63/50_inch_tv_with_120hz_refresh_rate.pdfIn PDF document text
    • https://cdn.sqhk.co/komagiju/jjlhbhv/todoist_apple_reminders.pdfIn PDF document text
    • https://cdn.sqhk.co/waxoxewanuvi/i6jewjj/neo_geo_pocket_game_drive.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413000/normal_5ff287f8a2df0.pdfIn PDF document text
    • https://cdn.sqhk.co/wisaputal/g4pH9lk/milinukojagolivumawidazi.pdfIn PDF document text
    • https://cdn.sqhk.co/remezebona/gcUFgiV/48827041129.pdfIn PDF document text
    • https://cdn.sqhk.co/jiliroba/aiaQIjb/safcol_bursary_2019_application_form.pdfIn PDF document text
    • https://cdn.sqhk.co/wetewajaba/hijbF6Q/93864229059.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/jevelel/14052641408.pdfIn PDF document text
    • http://rixibedi.onlinewebshop.net/transistor_bd139_smd.pdfIn PDF document text
    • https://s3.amazonaws.com/sazomo/putifutuvetikixulirefa.pdfIn PDF document text
    • http://legokejapo.atwebpages.com/le_bro_code_barney_stinson.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_off0000ec5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC5D 5652 bytes
SHA-256: 566921a0997b9c27007223409c52f282949dd6f27a70ed0bd8a6a13374c015b4
font_01_sfnt_off0000ff9a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF9A 10828 bytes
SHA-256: 436575a1babb6511367b00a9e8e555872122dcb93208fb0e199c1294f7fbe852

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