Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b37d89d5bf02c77…

MALICIOUS

PDF

81.3 KB Created: 2021-09-14 07:58:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-25
MD5: 3d95c3dbad1004f5ba5c96d0b0e8bf2f SHA-1: 963e01c6aa9478013c49f0d5adf2a505f6c4c3a0 SHA-256: 4b37d89d5bf02c77df36199cb8b0fbeb84fd86908fbe0bc33e01c54d7842d489
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9972

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://klingende-zeder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613081a866ee5---25096530322.pdf In PDF document text
    • http://www.letnifestiwal.pl/ckfinder/userfiles/files/kavuvamunivan.pdfIn PDF document text
    • http://turinimoti.com/assets/userfiles/file/88024378318.pdfIn PDF document text
    • http://eastendmediation.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/tuxadagok.pdfIn PDF document text
    • http://parfumerieindex.nl/images/uploads/62827227368.pdfIn PDF document text
    • http://zhizhencn.com/filespath/files/20210909124701.pdfIn PDF document text
    • http://se-ty.com/uploads/userfiles/file/kobobakirizom.pdfIn PDF document text
    • http://eternoohydro.com/d/files/wikomewibivelufu.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/pifawifulamizoso.pdfIn PDF document text
    • https://www.q-jin.ne.jp/ckfinder/userfiles/files/21886718686.pdfIn PDF document text
    • https://longhoang.vn/upload/files/74650064861.pdfIn PDF document text
    • https://pt2-turbo-j3t.com/contents/files/zomejulizevoxudorowota.pdfIn PDF document text
    • https://niagarablock.com/application/webroot/userfiles/file/pilox.pdfIn PDF document text
    • https://leuphuotcamap.com/uploads/image/files/fegaviduw.pdfIn PDF document text
    • https://moolans.com/uploads/files/46499453459.pdfIn PDF document text
    • http://miass.realxenon.ru/uploads/files/44002122533.pdfIn PDF document text
    • http://lex.tj/img/file/93553289119.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/66495545169.pdfIn PDF document text
    • http://flixgolf.com/ckeditor/ckfinder/userfiles/files/suxepi.pdfIn PDF document text
    • http://mis.nrru.ac.th/gradjournal/ckfinder/userfiles/files/27398433939.pdfIn PDF document text
    • http://ladyqueen.it/userfiles/files/riguvewopixi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=fake+gps+and+routes+goPDF 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_off0000cd9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e5b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5B0 23204 bytes
SHA-256: 72226acd6591b3e226dc67ae32f38633fa700c95e621df20907f0fc7689ad3d3
font_02_sfnt_off0001201a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1201A 10596 bytes
SHA-256: 78e6899fed87393da79aecd8ffb39c77f3947c5db13f6498de984f0abe16286e

Open this report in the interactive analyzer, or submit your own file for analysis.