Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f9db53c2d5f1181…

MALICIOUS

PDF

90.0 KB Created: 2021-09-17 03:47:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e7a61d66ce114fb8a3e4c9f2584371bb SHA-1: 892e2067c712292eee57f65f829934c39b481ec7 SHA-256: 5f9db53c2d5f1181026b2a899f16163854915bbae976170310f1aed593584d83
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and embedded links are consistent with techniques used to redirect users to malicious sites, potentially for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://coretry.ru/uplcv?utm_term=call+me+by+your+name+watch+online+123movies PDF link annotation
    • http://travelci.ru/ckfinder/userfiles/files/3817314176.pdfIn PDF document text
    • https://taxfirma.com/userfiles/file/fidifunarega.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/49051675770.pdfIn PDF document text
    • http://thietbiotovn.com/Images_upload/files/98635602949.pdfIn PDF document text
    • http://digjamaica.com/app/webroot/files/jewisusawidewad.pdfIn PDF document text
    • https://csam-villepinte.org/uploads/images/file/70432874888.pdfIn PDF document text
    • https://greenfins-thailand.org/uploads/file/kadotezineda.pdfIn PDF document text
    • https://hr-serdahel.hu/images/file/kakusibepetojuzuvol.pdfIn PDF document text
    • http://quangcaosms.org/media/ftp/file/kirewomawu.pdfIn PDF document text
    • https://alakharia.com/public_html/userfiles/file/mawibolexo.pdfIn PDF document text
    • http://wxbeimei.cn/upload/ckimg/files/202109081159086611.pdfIn PDF document text
    • http://speednewslive24.com/assets/ckfinder/core/connector/php/uploads/files/tekimejew.pdfIn PDF document text
    • http://saringkarnwood.com/UserFiles/file/3817671103.pdfIn PDF document text
    • https://skyfireconsulting.com/wp-content/plugins/super-forms/uploads/php/files/93dkg47qj3lii27f6o52kulciq/29158477382.pdfIn PDF document text
    • http://kovospm.cz/fotky/file/foloba.pdfIn PDF document text
    • http://contelex.it/userfiles/files/sunupim.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/39308655572.pdfIn PDF document text
    • https://nucamsa.es/userfiles/files/solifibabalimeviletu.pdfIn PDF document text
    • https://napraforgohotel.hu/upload/file/29853493619.pdfIn PDF document text
    • https://masukpt2.com/contents/files/sasabitavubirul.pdfIn PDF document text
    • https://derfo.info/resimler/files/xotosagonujamefevuj.pdfIn PDF document text
    • http://host.keraladreamhomes.com/~viswabrahmathach/admin/fckeditor/editor/filemanager/connectors/php/userfiles/file/laxovekirujopisomidi.pdfIn PDF document text
    • https://www.bakkersvlaanderen.be/resources/plugins/ckfinder/userfiles/0/files/63027063337.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109122235445031.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_off0000f7b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7B9 11376 bytes
SHA-256: 48b39df182d622d2c01f0bf07eafc4c55c93ac304834a1c417ca03a868b6873f
font_01_sfnt_off00011283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11283 18024 bytes
SHA-256: 809ee0247fde8c3ca6c7cba188ede9dd823b9d9bf7fdd25287052c892ca9876b
font_02_sfnt_off0001419c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1419C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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