Malicious PDF — malware analysis report

Static analysis result for SHA-256 241e3c6ce6afcbc7…

MALICIOUS

PDF

74.1 KB Created: 2021-09-08 16:31:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: d983d49bc7c21551a4e5be95f1c43405 SHA-1: 9f55f1160ff49e2e3e4459243230cef648d57a1c SHA-256: 241e3c6ce6afcbc7fc437e3298d1f198c4b6fb0627da5ecf2d83d5c93534c7c7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for numerous links, suggesting an attempt to obscure the final malicious destination. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=jump+formwork+pdf PDF link annotation
    • https://callhfelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134608255e33---54983076565.pdfIn PDF document text
    • http://rbtyutj01.com/userfiles/files/85254760708.pdfIn PDF document text
    • http://2girlstrippin.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315afe2b80e---garuzuwiboxurovi.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/85012420742.pdfIn PDF document text
    • http://rockhousemethod.com/ckfinder/userfiles/files/dojev.pdfIn PDF document text
    • http://topoint.net/userfiles/fckFile/20210903045321.pdfIn PDF document text
    • https://hse.tw/upload/file/40096653460.pdfIn PDF document text
    • https://krusomying.com/data/file/88319482520.pdfIn PDF document text
    • http://rejs2013.cycling-recycling.eu/imgturysta/files/rorilovisow.pdfIn PDF document text
    • http://brilliantsolarpaneling.com/userfiles/file/87804690705.pdfIn PDF document text
    • http://danies.ru/ckfinder/userfiles/files/35722769459.pdfIn PDF document text
    • https://wilsonbarrera.com/inicio/wp-content/plugins/formcraft/file-upload/server/content/files/161339b70ab2b8---kiribefi.pdfIn PDF document text
    • https://raguvosbaldai.manovonia.lt/images/files/gejenomewefa.pdfIn PDF document text
    • https://m-astar.com/UserFiles/files/xiwopujuzubi.pdfIn PDF document text
    • https://maisonforville.be/documents/file/69362259315.pdfIn PDF document text
    • http://gewoongroen.eu/app/webroot/files/userfiles/files/sixedaxovox.pdfIn PDF document text
    • http://aimic.com/userfiles/file/64937893512.pdfIn PDF document text
    • http://gzbaosui.com/uploadfile/files/guvupugadugav.pdfIn PDF document text
    • https://www.vita-organic.eu/admin/ckfinder/userfiles/files/xoxaz.pdfIn PDF document text
    • http://kamnitikamini.si/upload/files/nisimor.pdfIn PDF document text
    • https://nichecnk.leaddeehub.com/userfiles/files/93978724450.pdfIn PDF document text
    • https://hantverksakuten.se/ckfinder/userfiles/files/20876055031.pdfIn PDF document text
    • http://brmxn.com/userfiles/file/20210901114531_swuw4l.pdfIn PDF document text
    • https://europacreativaeuskadi.eu/files/galeria/files/zumalenunixox.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_off0000c0f3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC0F3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d90a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD90A 10128 bytes
SHA-256: 3fc4ccedb223ffa19d5b8ead8b4d0a94fa0837d6117543a446b19b000382695c
font_02_sfnt_off0000efa9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFA9 16588 bytes
SHA-256: 1ac94782cd97d64398540a08bd7d78bcbb91fa1dd96a5f2c650f85ea52cbb15f