Malicious PDF — malware analysis report

Static analysis result for SHA-256 becd540445e99dfe…

MALICIOUS

PDF

71.6 KB Created: 2021-09-29 01:06:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f2e44535fc8126e74256a990630bb83f SHA-1: b5e8b343105d15795ad119735b611f5b7096d74d SHA-256: becd540445e99dfe8dbe8b094702f248528a0b1f2eeeb761ca0b1d9f39918d8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The presence of PDF-specific heuristics like PDF_SEO_DISPOSABLE_LINK_FARM further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the overall detection profile strongly suggest a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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 http://rebeccaosborne.com/uploads/6624773084.pdf In PDF document text
    • http://chrisdepanneservices.fr/Sites/cds/files/givulufakus.pdfIn PDF document text
    • http://e-menu.hu/editor_up/rapowudedomaxezugaresa.pdfIn PDF document text
    • http://cedresarquitectura.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614569be07a11---katogumoda.pdfIn PDF document text
    • https://sunarchegypt.com/userfiles/file/lavununeri.pdfIn PDF document text
    • http://restravel.ru/ckfinder/userfiles/files/20707829463.pdfIn PDF document text
    • http://terralis.eu/catalogue_dynamique/file/letodarejamurixetipilim.pdfIn PDF document text
    • http://kryotherapie.net/neu/userfiles/file/rumaraf.pdfIn PDF document text
    • http://guides2alpes.org/uploads/file/mokozib.pdfIn PDF document text
    • https://thefertilizergranulators.com/d/files/waditeru.pdfIn PDF document text
    • https://www.weboonline.com/ckfinder/userfiles/files/rujajadupivunuvevinoka.pdfIn PDF document text
    • https://tsydesign.com/userfiles/jws/files/50708469712.pdfIn PDF document text
    • http://caffepontoni.com/uploads/file/19099577787.pdfIn PDF document text
    • http://runwellconsulting.com/file/file/nilumiwuja.pdfIn PDF document text
    • https://proia.bg/userfiles/file/22187947208.pdfIn PDF document text
    • http://solarissoft.com/img/userfiles/files/28821365241.pdfIn PDF document text
    • http://globalnetworks.de/www.galabau-poscher.de/main/preview/ckfinder/userfiles/files/zivikopepinosine.pdfIn PDF document text
    • http://impressivetravelvietnam.com/upload/files/lovufaselategu.pdfIn PDF document text
    • http://ipublicity.cz/data/file/21137218987.pdfIn PDF document text
    • http://jandenzobv.com/image_uploads/file/29146223830.pdfIn PDF document text
    • http://tdsns.ru/userfiles/file/47305558906.pdfIn PDF document text
    • http://erbamedica.org/userfiles/files/42043061884.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=telegram+apk+file+downloadPDF 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_off0000b2ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB2AE 10716 bytes
SHA-256: 68148ba6da6d5d5f0b36645da701a7d0aa5f8649d62fd5d632eb7d652f74b44a
font_01_sfnt_off0000cb12.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB12 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e324.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE324 17716 bytes
SHA-256: d4829fbda69facc9a361c7422cc41c79b293d0a66c0c6205282c47305b848d26

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