Malicious PDF — malware analysis report

Static analysis result for SHA-256 af9ffd41c72628a8…

MALICIOUS

PDF

85.5 KB Created: 2021-09-13 16:46:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 32015ad837a4f1430d819eb70bd61efa SHA-1: 90e4135a7ee1b07f546b748e0701b7e3324cce42 SHA-256: af9ffd41c72628a827162789aa8fc3ecb14b0ffe19e98c7084b1d262c36ff616
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=how+to+find+my+lost+android+phone+without+internet PDF link annotation
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/jilanulaxubaguvus.pdfIn PDF document text
    • https://majubesar.org/contents/files/savax.pdfIn PDF document text
    • https://kibledergisi.net/resimler/files/liketudukojotezupifonod.pdfIn PDF document text
    • https://swalaya.in/userfiles/file/16583999686.pdfIn PDF document text
    • http://shinaval.ru/userfiles/file/32932015918.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/parijebeguwovaduk.pdfIn PDF document text
    • http://zamdq.com/filespath/files/20210910105203.pdfIn PDF document text
    • http://inhome360.ru/admin/ckfinder/userfiles/files/50516068664.pdfIn PDF document text
    • http://wmc21.com/ckupload/files/bisefot.pdfIn PDF document text
    • https://www.champagne-cornevin.fr/ckfinder/userfiles/files/24646551481.pdfIn PDF document text
    • http://bonfiremadigan.com/uploads/fckeditor/file/koporedor.pdfIn PDF document text
    • http://stisk.com/file/5478220167.pdfIn PDF document text
    • http://gelateriacool.it/userfiles/files/831120423.pdfIn PDF document text
    • http://moscreen.in/cmsfiles/file/nerodemobojopa.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/jemuzugemonu.pdfIn PDF document text
    • https://pyhm.ca/wp-content/plugins/super-forms/uploads/php/files/3i0n4si59kbsgu28lp0aqqbv0v/87499106617.pdfIn PDF document text
    • http://yonseri.org/userfiles/files/kubelexabimib.pdfIn PDF document text
    • https://mobspace.xyz/web/img/podborky/files/55766767864.pdfIn PDF document text
    • http://atut-biuro.com/uploaded/file/40493818143.pdfIn PDF document text
    • https://clubberia.com/js/ckfinder/userfiles/files/lativoju.pdfIn PDF document text
    • http://fantalife.nl/userfiles/file/vidokujunugo.pdfIn PDF document text
    • http://sherwoodchambergolf.com/ckfinder/userfiles/files/zobisexilopuje.pdfIn PDF document text
    • http://vouchertiket.com/airplane/ckeditor/uploads/files/158859168.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_off0000e856.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE856 11056 bytes
SHA-256: 4d095102966ee86e709e99b9912aec503fb6181fd855f4d8063d64250dea1b6d
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 17620 bytes
SHA-256: ad1ecbc202019b0c14f84fbda26288d4f7b38876409304693b02a6714ef9f7a3
font_02_sfnt_off00012ffa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12FFA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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