Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bfd576750a7eea9…

MALICIOUS

PDF

79.4 KB Created: 2021-09-18 05:58:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 3af2d50009862cd5dbc1f30515dd3925 SHA-1: ba6c300eb75bf2c54ef03447234f1bd4c119c7cd SHA-256: 4bfd576750a7eea92e5cd3986e863c06c975412dec7ac4a9a83c4300200068b9
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The heuristic 'SE_BROWSER_INSTALL_LURE' indicates the document's content likely prompts the user to install a fake browser update or extension. ClamAV detection and ML classification further confirm its malicious nature, likely as a trojan downloader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Browser extension / update installation lure high SE_BROWSER_INSTALL_LURE
    Document tells the user to install a browser extension, plugin, viewer, or browser update to view content — a common social-engineering path for credential theft and malware installation
  • 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://pistant.ru/uplcv?utm_term=minecraft+game+online+play PDF link annotation
    • http://numismatika-nbkpdy.cz/userfiles/file/25015658864.pdfIn PDF document text
    • http://pathtojanna.com/userfiles/files/juranipujowizudelogupigot.pdfIn PDF document text
    • http://yaqeen-eg.com/userfiles/file/38897230328.pdfIn PDF document text
    • https://kolodezrus.ru/wp-content/plugins/super-forms/uploads/php/files/2e51fa70213484a85f91ad320f700701/verujekopovorofukipogovax.pdfIn PDF document text
    • http://konemara.hu/userfiles/file/xezibolozezuvebaleki.pdfIn PDF document text
    • http://offerseir.com/basefile/offerseircom/files/94032346672.pdfIn PDF document text
    • http://sinostandards.net/upload/files/tumofuwumukurada.pdfIn PDF document text
    • https://fultoys.com/userfiles/nokoxuxowodowebejafitoro.pdfIn PDF document text
    • http://gruppocinofilomarsalese.com/userfiles/files/jujexinexubofud.pdfIn PDF document text
    • http://boxshop.mn/userfiles/files/47886167314.pdfIn PDF document text
    • http://eco-building.cz/UserFiles/File/14803644455.pdfIn PDF document text
    • https://kalashad.com/userfiles/file/kutitotuma.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/depupan.pdfIn PDF document text
    • https://autoskola-scp.com/files/48052668597.pdfIn PDF document text
    • https://kovtec.pl/eurostyl/photos/file/69754929962.pdfIn PDF document text
    • http://tatnhapkhau.com/ckfinder/userfiles/files/35742540328.pdfIn PDF document text
    • https://lederstuhlshop.de/ckfinder/userfiles/files/1605318029.pdfIn PDF document text
    • https://0924055971.com/uploads/files/202109151050151993.pdfIn PDF document text
    • http://www.pointcookelectrician.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16138cecd3ad28---38924201551.pdfIn PDF document text
    • http://christmaslandint.com/userfiles/92403017291.pdfIn PDF document text
    • https://www.thc.gda.pl/ckfinder/userfiles/files/63676126019.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_off0000cf57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF57 18316 bytes
SHA-256: 3c7a3d410a46be53676a724e4f504b01d2d962ca2fa3e770856774e5619eb616
font_01_sfnt_off0000ff34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF34 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001174b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1174B 10760 bytes
SHA-256: 6b890211b01f4959a218199a12bdc428236f074429177d1ebc335aaa4cb1b274

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