Malicious PDF — malware analysis report

Static analysis result for SHA-256 bad5780c81c1b0d2…

MALICIOUS

PDF

65.5 KB Created: 2021-09-16 03:08:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 66d26b27b13fc367a5618cfc1cb80682 SHA-1: d49270750615ec13272b346fe73f5f2410d337f1 SHA-256: bad5780c81c1b0d242bb014c84342d447e262cffee639a2e1efbd4e85463736b
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs pointing to various domains, suggesting it functions as a link farm or phishing lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' specifically flags the document's structure as a link farm on disposable hosting, reinforcing the phishing or malware distribution attack pattern. No scripts were extracted, but the presence of numerous external URIs suggests the primary goal is to redirect the user to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.6298

Heuristics 4

  • 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
  • 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://archism.ru/uplcv?utm_term=vortex+cloud+gaming+for+pc PDF link annotation
    • https://www.jakketoes.be/ckfinder/userfiles/files/pifukezofewumerudidim.pdfIn PDF document text
    • http://mcenterdk.ru/fck_editor_files/files/benojapuxomoxoxuxakor.pdfIn PDF document text
    • http://montex.pro/uploads/userfiles/file/kevawudujojare.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/vabelalezutejul.pdfIn PDF document text
    • http://dayou.tw/uploadpic/files/202109041906525785.pdfIn PDF document text
    • http://xperion.hu/wp-content/plugins/super-forms/uploads/php/files/cc71247757210594c3b56a3a1d6a2390/15156728227.pdfIn PDF document text
    • https://aradmissions.com/ci/userfiles/files/36800182487.pdfIn PDF document text
    • http://selmanoglusigorta.com/userfiles/file/79417223486.pdfIn PDF document text
    • http://kroonzuivel.nl/ckfinder/userfiles/files/lekipuve.pdfIn PDF document text
    • https://grootformaatspandoeken.nl/userfiles/file/58742312642.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-3/20210903225000116997.pdfIn PDF document text
    • http://aytekinpolatel.com/image/files/ruvamovegazu.pdfIn PDF document text
    • http://cascad-trans.ru/files/42048600940.pdfIn PDF document text
    • http://basumati.com/app/webroot/ckfinder/userfiles/files/seletubavorexofefoguru.pdfIn PDF document text
    • https://pushtypathshala.com/demo/aims/files/images/files/xonuvizarevofadi.pdfIn PDF document text
    • http://dolekkoyum.com/admin/UserFiles/file/32071548731.pdfIn PDF document text
    • https://bem-sa.com/img/file/niturelufaf.pdfIn PDF document text
    • http://fractinvest.com/uploads/file/josamiluxil.pdfIn PDF document text
    • http://scuolascifondocortinadolomiti.it/userfiles/files/vezawu.pdfIn PDF document text
    • https://brahmagnanam.org/fck_uploads/file/61004350189.pdfIn PDF document text
    • http://nakloboucku.cz/uploaded/file/goturexiremevemijibibixu.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/19521829141.pdfIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b175.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB175 16372 bytes
SHA-256: 59ea09f425e34f0652b5e061fcf20a8694f67a170272433036e1790b16eaf631
font_01_sfnt_off0000db09.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB09 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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