Malicious PDF — malware analysis report

Static analysis result for SHA-256 f68bd39a00b9e586…

MALICIOUS

PDF

104.8 KB Created: 2021-09-20 13:01:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 2d6909bc4a3e56e121379ba07027c94c SHA-1: b72305c5e8deca47ca8461c03bed4ef4ee0c24cc SHA-256: f68bd39a00b9e586355ab3182f30c46e570446b8feb5db7e78e3101591c23d29
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to various domains, many of which are identified as part of a link farm. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests this is an SEO manipulation tactic. While no scripts were explicitly extracted, the ML classifier and ClamAV detection indicate malicious intent, likely related to phishing or malware distribution via these links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9885

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://ymmicro.com/files/files/gozovixifatepuwomeramugol.pdf In PDF document text
    • http://fernandopelosini.it/userfiles/files/daziferivolojeriga.pdfIn PDF document text
    • https://danfort.lv/userfiles/file/64223424071.pdfIn PDF document text
    • http://microsolder.hu/userfiles/files/vaximakafikijepiguj.pdfIn PDF document text
    • https://fiscconsulting.com/userfiles/file/xedisuwolovejut.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/vubura.pdfIn PDF document text
    • http://agama-rc.com/upload/files/bikinurolalix.pdfIn PDF document text
    • http://uekekb.ru/!upload/files/wobaginifak.pdfIn PDF document text
    • http://sharon-barron.com/userfiles/files/noforezat.pdfIn PDF document text
    • http://arebiatours.com/uploads/files/bolitesebikulilumigilen.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/16125378099.pdfIn PDF document text
    • http://www.siposferenc.hu/html/nukagovigudojiruxo.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/75179295564.pdfIn PDF document text
    • http://peterpan1996.it/userfiles/files/60860666545.pdfIn PDF document text
    • http://kbo.pl/ckfinder/userfiles/files/49392887032.pdfIn PDF document text
    • https://businessincasey.com.au/application/third_party/ckfinder/userfiles/files/pasofugujomifolojero.pdfIn PDF document text
    • http://kosmonautika.ee/ckfinder/userfiles/files/5797208209.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/16140208f4a59e---35316616882.pdfIn PDF document text
    • http://bephoangdung.vn/uploads/ckfinder/files/ditinaxuwararerof.pdfIn PDF document text
    • https://sonntag-immobilien.lu/userfiles/files/gekubemurifinoxovipal.pdfIn PDF document text
    • https://kaptenhoki.info/contents/files/88676214358.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/jabofabo.pdfIn PDF document text
    • http://kernenshepler.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/14424113481.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210907095703.pdfIn PDF document text
    • http://mn-print.ru/ckfinder/userfiles/files/83043441886.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/LPIa9PGmDLg/uplcv?utm_term=block+puzzle+gcash+apkPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_005_off0001408a.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x1408A 16244 bytes
SHA-256: 9229bde5e3614c940ebb387a6affb910e6b09cdb82f6b0ab59768fbd23138caf
font_00_sfnt_off00011024.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11024 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0001283b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1283B 10564 bytes
SHA-256: 3ecd3621ea6091c62f0ed681e81fb16142782de77678b0db7f6ec2d7f76ee214
font_03_sfnt_off00015676.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15676 24224 bytes
SHA-256: 802348f7e0b2ff957f9bb573062a65a95470877fb616c0069c8f690c5ec26bb0