Malicious PDF — malware analysis report

Static analysis result for SHA-256 3785c9313b85c5cd…

MALICIOUS

PDF

82.0 KB Created: 2021-09-13 06:43:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-27
MD5: 08efb84200dc5cb06760e09b10fd7589 SHA-1: c7c35f1d93481e925a022cf7ca30ab849a518a06 SHA-256: 3785c9313b85c5cd9f260017f75aada5d82cf637570044f086cb0ddc9fe6edb1
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are structured as link farms, a common tactic for phishing or distributing further malware. While no scripts were directly extracted, the PDF structure and heuristic firings strongly suggest malicious intent through redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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://www.nena-artspace.com/ckfinder/userfiles/files/5443851501.pdf In PDF document text
    • https://www.alugutader.fr/ckfinder/userfiles/files/55890610289.pdfIn PDF document text
    • http://stepasidemedical.com/images/uploads/file/gidemusiruwolifuvudima.pdfIn PDF document text
    • https://mebelihome.ru/upload_picture/39110078864.pdfIn PDF document text
    • http://galluccifaibano.com/userfiles/file/fazezebaxubedodowar.pdfIn PDF document text
    • https://sleepthai.com/piceditor/file/74525949293.pdfIn PDF document text
    • http://dienvietbac.com/uploads/files/gunija.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/nerezo.pdfIn PDF document text
    • https://bio-obst-und-gemuese.de/userfiles/file/21268724450.pdfIn PDF document text
    • http://jszl-rolls.com/filespath/files/20210905034503.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/41789585937.pdfIn PDF document text
    • https://patc.fr/imagesfile/30825278863.pdfIn PDF document text
    • https://gulf-rope.com/images/bulk_images/files/9335162422.pdfIn PDF document text
    • https://zapcdn.space/web/img/podborky/files/80128216855.pdfIn PDF document text
    • http://falcon.dk/sites/default/files/webfm/96184059990.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/DOqCt-cVA4I/uplcv?utm_term=custom+views+androidPDF 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_off0000ddae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDAE 17540 bytes
SHA-256: d4fe68a1cbdfbd51d2a5ad2f86c2373feb2e385c9b5dd7da955c995033816829
font_01_sfnt_off00010b11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B11 10648 bytes
SHA-256: c0b282e467f76b97ea9d54296272ff23ef64b9868d83336e0fcf8c248e4c0462
font_02_sfnt_off00012390.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12390 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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