Malicious PDF — malware analysis report

Static analysis result for SHA-256 1f4818b9f2447887…

MALICIOUS

PDF

96.1 KB Created: 2021-09-17 18:15:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-02
MD5: 20f2f54612661943d870c531e6b058f4 SHA-1: 0227f20af8e83344c4a8a3d8fbe3cc538c42c25c SHA-256: 1f4818b9f24478876ac7e01003477d8f296af42c608899494fa56872ab00e99b
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9936

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://queure.ru/uplcv?utm_term=gospel+of+matthew+commentary+pdf PDF link annotation
    • http://klemanpince.hu/files/file/gevizoti.pdfIn PDF document text
    • http://htbestcomputer.com/media/ftp/file/vamifajuxena.pdfIn PDF document text
    • http://barrospizzadb.com/uploads/files/96559520081.pdfIn PDF document text
    • https://sikahaiphong.com/images/news/files/jinafimenisosajomo.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/2548587360.pdfIn PDF document text
    • http://ztkammer.at/uploads/file/nekilubo.pdfIn PDF document text
    • http://focalthai.com/file_media/file_image/file/64074064226.pdfIn PDF document text
    • https://unitytradefze.com/ckfinder/userfiles/files/zereviwakexaj.pdfIn PDF document text
    • http://icr34.fr/icr/icr34.fr/www/files/files/40278068281.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/zedelusosajiluwomovaxaneb.pdfIn PDF document text
    • https://www.sherpachristain.org.np/ckfinder/userfiles/files/37059561223.pdfIn PDF document text
    • http://ancheng-medical.com/uploadfile/files/nerurupuzojizekuduwinejuj.pdfIn PDF document text
    • http://gzcil.com/uploadfile/files/70729299187.pdfIn PDF document text
    • http://kolkandkolkdesign.com/site/data/ws/files/vexosukuwexekibideli.pdfIn PDF document text
    • https://jeneifogaszat.hu/cikkdata/files/6402091429.pdfIn PDF document text
    • http://sloplast.com/userfiles/files/regod.pdfIn PDF document text
    • https://asthasupermarket.com/userfiles/file/nifive.pdfIn PDF document text
    • http://www.saletime.gr/admin/fckfiles/file/32129851895.pdfIn PDF document text
    • http://sangjeom.com/userfiles/file///56304971384.pdfIn PDF document text
    • http://capmar.eu/userfiles/file/jolomidel.pdfIn PDF document text
    • https://www.abaco-engineering.it/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb536db479---pureluwafesenusivuvotiw.pdfIn PDF document text
    • http://union.travel/ckfinder/userfiles/files/63670865140.pdfIn PDF document text
    • http://onestep-tokyo.com/userfiles/file/kikekanetupexep.pdfIn PDF document text
    • http://originalcheck.it/public/img_admin/file///23074806245.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_off0001115d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1115D 11032 bytes
SHA-256: 3f183df6738b908c224e2cccda109ec7d3a8baca28a9a76dd2f9455d79d6ea47
font_01_sfnt_off00012afd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001430f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1430F 18452 bytes
SHA-256: 7b17415b9402d76ba3b378ca90996fb7f904fd9b1a0e770b6d32fe52a969c0c0