Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf694a0a84d38d84…

MALICIOUS

PDF

75.9 KB Created: 2021-09-17 07:10:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: a459fa884b429adac80690b261d688d4 SHA-1: 0e09c1f9881863006a10dfb014840f93aa9c721a SHA-256: bf694a0a84d38d845434c3d5a21c5a2caad6dfe2f683fd6d74944385c54fe8d6
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for exploiting vulnerabilities or redirecting users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest an attempt to host malicious content or phishing pages. ClamAV detection and ML classification further support its malicious nature, likely as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • 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://enkaotomatikkapi.com/depo/sayfaresim/file/fadanilonivalis.pdf In PDF document text
    • https://www.domaine-vrignaud.com/ckfinder/userfiles/files/fosub.pdfIn PDF document text
    • https://www.xtremefitness.com.au/application/third_party/ckfinder/userfiles/files/21774433041.pdfIn PDF document text
    • http://all-vehicle.net/js/upload/files/87985899868.pdfIn PDF document text
    • https://giaynangchieucao.com/userfiles/file/89767255410.pdfIn PDF document text
    • http://blgjad.com/upload/files/66250500076.pdfIn PDF document text
    • http://teacherandtraining.com/coj_u/KK/userfiles/files/bixugomimaf.pdfIn PDF document text
    • https://puntodeplacer.com/userfiles/file/fulirimuwexesaro.pdfIn PDF document text
    • http://gavionescodeinsa.com/userfiles/metobujig.pdfIn PDF document text
    • http://telektrans.hu/editor_up/vufuzas.pdfIn PDF document text
    • http://bitree.net/ckfinder/userfiles/files/80965328745.pdfIn PDF document text
    • http://hidropro.hu/upload/31065839861.pdfIn PDF document text
    • http://badischer-kunstverein.de/ckfinder/userfiles/files/galufidusof.pdfIn PDF document text
    • http://bburago.info/admin/fckeditor/userfiles/file/21336263094.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/707603156.pdfIn PDF document text
    • http://registermycompany.in/admin/userfiles/file/45449647777.pdfIn PDF document text
    • http://kreativitaet-stadlhofer.at/global/images/userfiles/file/31458477875.pdfIn PDF document text
    • http://full814.com/upload/files/29859242759.pdfIn PDF document text
    • https://franchisebusinessadvisors.franchisebrokerwebsites.com/broker-site/files/files/13602113587.pdfIn PDF document text
    • http://dentistturkey.com/image/files/zopetusaxarimidite.pdfIn PDF document text
    • https://carthink.org/wp-content/plugins/formcraft/file-upload/server/content/files/1613e351bb8eea---38342123033.pdfIn PDF document text
    • http://rockbond-aac.com/id-admin/fckImages/file/66549270311.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109082102124628.pdfIn PDF document text
    • https://woft-dining.com/webroot/editor-uploads/files/58971536616.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=kinemaster+for+pc+free+download+windows+7PDF 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_off0000c511.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC511 10908 bytes
SHA-256: d750d9474ad35143935be23d2ab1dbfc334526dbe60865ced6c4e877dfc5fac7
font_01_sfnt_off0000de5e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE5E 16748 bytes
SHA-256: 3a429e5a31ec543a8024b42eab23af9c9dc22c3bc10055a9c2085766a65fe5a3
font_02_sfnt_off0001098f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1098F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1