Malicious PDF — malware analysis report

Static analysis result for SHA-256 385d520292fdc91c…

MALICIOUS

PDF

79.7 KB Created: 2021-09-20 01:08:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 73a142356e7e281830da4f3987444da7 SHA-1: abc120ddb4ac679b5dc51d03cb5bf72a56187874 SHA-256: 385d520292fdc91c1ef6cd0e0bf494e84f5e83af6790fb91bb119dbd41daac7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded links, many pointing to unknown PDF files, suggesting a link farm or redirection scheme. One heuristic specifically flagged the PDF as a link farm on disposable hosting, further supporting a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

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 http://www.sunarsurdurulebilir.com/wp-content/plugins/super-forms/uploads/php/files/jn37glaqr8r4d6i20poql3evb0/51924071281.pdf In PDF document text
    • https://balajihighfields.in/userfiles/file/83166867548.pdfIn PDF document text
    • https://eurosan.pl/user_images/file/tizadonugaboreva.pdfIn PDF document text
    • http://digilit.ir/basefile/digilitir/files/vumivunasusarokamoz.pdfIn PDF document text
    • http://omni-links.com/images/blog/file/57398262939.pdfIn PDF document text
    • http://niestachow.pl/data/aktualnosci_imgs/file/88861214571.pdfIn PDF document text
    • http://ddaengshop.com/ckupload/files/xisowufejumogobidavo.pdfIn PDF document text
    • http://naso10.com/userData/board/file/10772171444.pdfIn PDF document text
    • http://aibasavar.edu.bd/app/webroot/ckfinder/userfiles/files/61030997539.pdfIn PDF document text
    • http://cokhihoangvinh.com/uploads/userfiles/file/kapowuduzamulamefuniw.pdfIn PDF document text
    • http://edv-denk.com/userfiles/file/lewaranuloti.pdfIn PDF document text
    • http://stadion-zarya.ru/ckfinder/userfiles/files/2845482623.pdfIn PDF document text
    • http://nensi.si/upload/file/82183995919.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/81822859457.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/nagujolenemu.pdfIn PDF document text
    • https://www.goldenplanet.dk/wp-content/plugins/formcraft/file-upload/server/content/files/161456f0fd1cbc---80922518401.pdfIn PDF document text
    • http://kovacsoltvaskerites.hu/images/file/poboduluxosege.pdfIn PDF document text
    • http://bckbytow.naszbip.pl/img/upload/files/zadegexejubupemimavog.pdfIn PDF document text
    • https://soechi.com/userfiles/file/wujeresema.pdfIn PDF document text
    • https://aneri12.eu/res/file/92404620179.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=download+valorant+android+indonesiaPDF 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_off0000d541.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD541 17172 bytes
SHA-256: e1306a499f892e15264b2425c72b1ce072eb97733d14eab28807fbb47af07e6e
font_01_sfnt_off000101a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000119bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x119BC 10392 bytes
SHA-256: 407bd128047a4bf5e2aaa5a4d09ff64a0651ebf628a0168170ab3e4e80bcfa8b

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