Malicious PDF — malware analysis report

Static analysis result for SHA-256 43526443d7d512d0…

MALICIOUS

PDF

86.0 KB Created: 2021-09-20 06:13:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 84063e4c83c8eaec3a2042d8c85a432b SHA-1: 0bbe445ca1e31b716f7b0a05d0dbb0a74aa7aa36 SHA-256: 43526443d7d512d04f8e561ccfa62b5f0da076d6c13ec88c191be3b233dce115
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains numerous embedded URLs pointing to external sites, suggesting it acts as a lure or redirector. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a potential link farm strategy to obscure the final malicious destination.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://aldwalia.com/userfiles/files/gezuxelijaki.pdf In PDF document text
    • http://chongthamphucthang.com/images/news/files/luliwizeme.pdfIn PDF document text
    • http://elesi.eu/fichiers/files/13614000430.pdfIn PDF document text
    • https://maurinet.com/userfiles/file/toxavoneladimaroga.pdfIn PDF document text
    • https://robodom.si/files_vsebine/fiwojumo.pdfIn PDF document text
    • https://www.azulejositurry.com/wp-content/plugins/super-forms/uploads/php/files/eo1jqr19kirhcqai7ltgtk7u86/politidewamarufotoxetugaw.pdfIn PDF document text
    • http://cmrivestimenti.com/userfiles/files/kefopiwoja.pdfIn PDF document text
    • http://motolargo.pl/userfiles/file/68997071101.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/71181399687.pdfIn PDF document text
    • https://qualityroofinnandsuites.com/nbloom/fckuploads/file/98498996898.pdfIn PDF document text
    • http://theloanwala.com/userfiles/file/luwubiwavegomu.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/87245536605.pdfIn PDF document text
    • http://dienlanhhuubinh.com/upload/files/lupozunugaratowema.pdfIn PDF document text
    • http://radio6deenero.com/uploaded/files/talilujikunejuzokok.pdfIn PDF document text
    • http://playitdirect.ca/ckfinder/uploadfiles/files/wodimuve.pdfIn PDF document text
    • https://theshamrockpublecco.it/file/27251764215.pdfIn PDF document text
    • http://testplanet.nl/uploads/files/dolimugi.pdfIn PDF document text
    • http://talesma.com/E/file/81487680567.pdfIn PDF document text
    • https://trichynext.com/wp-content/plugins/super-forms/uploads/php/files/536726c93b60e65e2e2de87f29030741/87261463740.pdfIn PDF document text
    • http://doggystylzgrooming.com/admin/photos/file/mekipewilotuna.pdfIn PDF document text
    • http://tgtech-auto.com/userfiles/file/tijinopon.pdfIn PDF document text
    • https://chp-travel.ir/data/file/71904954673.pdfIn PDF document text
    • http://acutecardio.ru/sadm_files/77467924034.pdfIn PDF document text
    • http://ventexevent.se/uploads/file/xalefomanotogu.pdfIn PDF document text
    • http://gachmenminhchien.com/media/ftp/file/dedut.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/GLLx1DTH0VQ/uplcv?utm_term=cognitive+development+theory+by+jean+piaget+pdfPDF link annotation
    • 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_off0000e949.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE949 11256 bytes
SHA-256: c18b9828c41f4bee8a2d66cb3846320545f51fc03a3617234c5ea101e9188449
font_01_sfnt_off0001030e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1030E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b20.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B20 18668 bytes
SHA-256: 3cbd36dfa49b54c020a34e01d9cdd2143c14c1c90513cd40e0b61908faf56ec4

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