Malicious PDF — malware analysis report

Static analysis result for SHA-256 12796586bd4c9431…

MALICIOUS

PDF

82.9 KB Created: 2021-09-08 23:04:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 7e3380b7e075644b291f383d8f0ff37c SHA-1: eb0ec5411cd71dc9d5a102b301671018d768264c SHA-256: 12796586bd4c94310527958ddc15d152f2f98f4c54f530900ded515a8cbfdd5c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the presence of numerous embedded URLs suggest the document is designed to redirect users to potentially harmful websites, possibly for phishing or malware downloads. No scripts were extracted, but the structure and URL patterns are indicative of a malicious PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://brs.jo/userfiles/files/koworatux.pdf In PDF document text
    • http://e-motyle.natura2000.pl/imgturysta/files/mawuwatojeka.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/a32585dd7e23ba2926be5879e94e5a6b/69943484399.pdfIn PDF document text
    • http://graviroz.hu/ckfinder/userfiles/files/57923103660.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/deregoligizi.pdfIn PDF document text
    • http://baltyk.recykling-rejs.pl/imgturysta/files/26268027301.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/10940553138.pdfIn PDF document text
    • http://clubselectionvoyages.net/images/file/barepiterujizuvo.pdfIn PDF document text
    • http://elementsgogreen.com/userfiles/file/jugugasoxulujuramiju.pdfIn PDF document text
    • http://melissajacksonmd.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137ad2e069b7---jikexabikitigave.pdfIn PDF document text
    • https://lenaoyunlar.com/calisma2/files/uploads/77925083715.pdfIn PDF document text
    • http://peter-crooks.com/userfiles/file/38997868719.pdfIn PDF document text
    • http://www.bash.cl/media/file/88230177949.pdfIn PDF document text
    • https://sproname.com/files/userfiles/files/25671222046.pdfIn PDF document text
    • http://valeneighbors.com/userimages/30429625996.pdfIn PDF document text
    • https://mcq-exambd.com/app/webroot/ckfinder/userfiles/files/83039823956.pdfIn PDF document text
    • http://cuacuongiare.vn/upload/files/muwubekaga.pdfIn PDF document text
    • http://z500.si/files/51923904485.pdfIn PDF document text
    • http://finance-bulldog.cz/UserFiles/File/50021661387.pdfIn PDF document text
    • http://wadirumshootingstars.com/userfiles/file///98965583382.pdfIn PDF document text
    • https://jazykovytabor.topenglish.sk/app/webroot/gallery/files/pigokuderowi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=codashop+apk+hackPDF 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_off0000d89f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD89F 10160 bytes
SHA-256: dd442a1cfc67df5e7971152ac626fe7e23f3fc8eba2a67867086a847dd39afd3
font_01_sfnt_off0000ef77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF77 21012 bytes
SHA-256: cb6d38a556eb6ae1331a46282ff29aed20638d6a10df66053bf3619b6eadbcf6
font_02_sfnt_off0001261e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1261E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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