Malicious PDF — malware analysis report

Static analysis result for SHA-256 435d4f0d7a261e8c…

MALICIOUS

PDF

79.4 KB Created: 2021-09-10 11:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-04
MD5: d1848b1064e5cccc6063ac2463d17068 SHA-1: 59e1fd2e7559f81f96097c129ed14dda0f8260fa SHA-256: 435d4f0d7a261e8c5a6c49d25c6fad1baf57cf104e63c6856f8b58a133cc3cee
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 0.9975

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://bydnjl.com/userfiles/files/82313215111.pdf In PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/kajoxudir.pdfIn PDF document text
    • http://xn--hh0b97d8is16e.com/userData/board/file/gofolefuwafekuwipibapel.pdfIn PDF document text
    • http://kleinschaden.expert/userfiles/file/36465979394.pdfIn PDF document text
    • http://home-hj.com/up_photo/file/veguvolifadowe.pdfIn PDF document text
    • https://amt-alarmy.pl/userfiles/file/sanikekanafapel.pdfIn PDF document text
    • https://oxi-dental.ro/imagini_ws/37942059527.pdfIn PDF document text
    • http://tabletopad.com/images/file/14684888704.pdfIn PDF document text
    • http://ambvet-trefontane.eu/userfiles/files/zaxatutalijizoxep.pdfIn PDF document text
    • http://humidorio.de/ckfinder/userfiles/files/84529975190.pdfIn PDF document text
    • http://tndgdemo2.com/ckfinder/userfiles/files/juvurazepa.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/kikepuropurimifuwew.pdfIn PDF document text
    • http://reclameindex.nl/images/uploads/48793385671.pdfIn PDF document text
    • https://guanlai.tw/uploads/files/202109100306025919.pdfIn PDF document text
    • http://www.dfdtrading.sk/ckfinder/userfiles/files/86292195645.pdfIn PDF document text
    • http://tecniagua.es/uploads/ckfinder/files/98589510393.pdfIn PDF document text
    • http://luchetti.it/userfiles/files/22741147370.pdfIn PDF document text
    • http://gaudi.tw/upload/file/vumaposijaronuduzobajiva.pdfIn PDF document text
    • http://elma-itc.ru/!upload/files/64317706723.pdfIn PDF document text
    • https://soechi.com/userfiles/file/21452809512.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/bofexub.pdfIn PDF document text
    • https://denimder.org/resimler/files/rirazutugipadusa.pdfIn PDF document text
    • https://emergent-partners.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613967ed042bb---51716195191.pdfIn PDF document text
    • http://farmaciafici.com/userfiles/files/88892654768.pdfIn PDF document text
    • https://accu-split.com/userfiles/files/rarujukamositidedomud.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=barron%27s+essential+words+for+ielts+audio+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_off0000cde5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCDE5 10620 bytes
SHA-256: 3388c90d29b014539c04f7c0fc79ff6b0e6035e475f2e034489c88836fedb66a
font_01_sfnt_off0000e66a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE66A 18040 bytes
SHA-256: dcde7d721866fd503ab727acf83a3882dded1319f033a276304631311ef0048d
font_02_sfnt_off0001156f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1156F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1