Malicious PDF — malware analysis report

Static analysis result for SHA-256 90f844b4ccedbacc…

MALICIOUS

PDF

93.5 KB Created: 2021-09-17 02:49:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 3a8768b76f1c77b86eaec7ca98587149 SHA-1: 5929ad6d700c162f820f9adacd4d147cd708fa8e SHA-256: 90f844b4ccedbacc144c880ca16dabf13692104e3135aab3d069fae3f265a95b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains embedded JavaScript and numerous external URIs, suggesting it's designed to redirect users to potentially harmful websites. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports that the PDF is part of a scheme to distribute links, likely for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://coretry.ru/uplcv?utm_term=harrison%27s+principles+of+internal+medicine+20e+pdf PDF link annotation
    • http://www.scea.edu.mn/ckfinder/userfiles/files/78605995301.pdfIn PDF document text
    • https://www.carlosfunes.es/wp-content/plugins/formcraft/file-upload/server/content/files/16143c6bd918e5---nazuvuwubivisavare.pdfIn PDF document text
    • https://webrekruit.com/php_codes/Scott/VieauAssociates/code/userfiles/file/fejelozodafume.pdfIn PDF document text
    • http://xn--42-jlclgg6a3e.xn--p1ai/userfiles/file/tamozag.pdfIn PDF document text
    • http://savaksangida.com/resimler/files/tosunogizola.pdfIn PDF document text
    • http://st-communications.com/ckfinder/userfiles/files/35272038058.pdfIn PDF document text
    • http://sowa-architekci.pl/userfiles/files/kafit.pdfIn PDF document text
    • http://studiotecnicoligioni.com/userfiles/files/7660257426.pdfIn PDF document text
    • https://goldfieldssanddrags.com.au/ckfinder/userfiles/files/makominezafabeginoze.pdfIn PDF document text
    • http://demo-enriquemora.shopcloud.es/ckfinder/userfiles/files/60347362859.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/lavinewugupewevimosulil.pdfIn PDF document text
    • https://europartner2.pl/uploads/50677734463.pdfIn PDF document text
    • https://btcauction.vn/hinhanh/file/22274300660.pdfIn PDF document text
    • https://www.pfgpartners.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1613b3872a4885---48214617281.pdfIn PDF document text
    • https://natatourism.com/userfiles/files/jokifapasoxurag.pdfIn PDF document text
    • http://foto-recepty.sk/images/fotky/47207332205.pdfIn PDF document text
    • http://skpizzasubs.com/uploads/files/695040235.pdfIn PDF document text
    • http://cmi.nfe.go.th/ckfinder/userfiles/files/61752512565.pdfIn PDF document text
    • http://studioingegneriavaragnolo.com/userfiles/files/jevunoj.pdfIn PDF document text
    • https://fetogram.ir/images/upload/files/26120090277.pdfIn PDF document text
    • http://danieldesignpro.com/userfiles/mokapefasumej.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/58900009107.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_off000108ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108BA 11048 bytes
SHA-256: 412e7d8eeb954f627d7e5b76dfce2b2840fe23f32ba0e7c2788e3c8fc0427e09
font_01_sfnt_off00012270.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12270 17596 bytes
SHA-256: 4995cdd7d13da146feab5c3e7fb4d15425b86aa5c9e93269a851eb1a1198b243
font_02_sfnt_off00014fc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14FC9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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