Malicious PDF — malware analysis report

Static analysis result for SHA-256 1d4d428af3a467f8…

MALICIOUS

PDF

65.6 KB Created: 2021-09-17 13:26:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 8f7378f3c90d5efc7237886b46c2c6e8 SHA-1: 9769e272702189ea781075808687a3f268e5b250 SHA-256: 1d4d428af3a467f87ce6785fa4fd454fd96bbfeaa2978cdaaa97be2248e62371
124 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to suspicious domains and are likely used to redirect users to phishing sites or download further malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests a link farm strategy, common in phishing campaigns.

Machine Learning

  • Nyx PDF Classifier malicious score 0.5541

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 http://kuryakyn.ru/userfiles/file/rovuvaxonuwesopes.pdf In PDF document text
    • https://hkpefa.org/editor_upload/file/64317066872.pdfIn PDF document text
    • https://mattress-leader.com/media/lamodenepato.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/330db869201b1c2fafd0ef7192398e99/feriwenulu.pdfIn PDF document text
    • http://theponghop.com/upload/files/lapozuxovezegipeninomutad.pdfIn PDF document text
    • http://michelesherrinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/sulabegajabezejupuduj.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/foxug.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/51893406494.pdfIn PDF document text
    • http://seattlebestteriyaki.com/uploads/files/44611854146.pdfIn PDF document text
    • http://orourkelawoffice.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/dozutilegore.pdfIn PDF document text
    • https://ilonew.tasksplan.com/userfiles/files/76017961849.pdfIn PDF document text
    • http://fs-select.com/images/blog/file/luvobafutipovogeju.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/22270308178.pdfIn PDF document text
    • http://aid-calais.com/userfiles/file/momuv.pdfIn PDF document text
    • http://palyavalaszto.hu/teszt/upload/file/nororupotodutizivilija.pdfIn PDF document text
    • http://energcomb.net/cms_enercomb/sgi_userfiles/userfiles/files/seleparagajik.pdfIn PDF document text
    • http://mikomisushi.com/uploads/files/99727542219.pdfIn PDF document text
    • http://maginsaatmetal.com/resimlerfiles/favirunawig.pdfIn PDF document text
    • https://e-tta.com/app/webroot/userfiles/files/lenodurabobutire.pdfIn PDF document text
    • https://inprovitcentroamerica.com/ckfinder/userfiles/files/vuwopamuwedirem.pdfIn PDF document text
    • http://objets.immoweiss.lu/userfiles/files/rugafawagebojixax.pdfIn PDF document text
    • https://sieuthimaytinhcu.vn/upload/files/58848359217.pdfIn PDF document text
    • https://apoc.com.au/wp-content/plugins/super-forms/uploads/php/files/b108c123e8f82d27dbb75bebb7c2ccc3/56927655343.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/tomiponelokexulogeled.pdfIn PDF document text
    • http://symbioticlifetech.org/attfile/fckimg/file///2021091521129_251976869.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=teorema+fundamental+del+calculo+integral+pdfPDF link annotation
    • 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_off0000bb44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB44 10860 bytes
SHA-256: 1873ec06d0e76c858d1a791789d77d33c2a5715b95f7f859ac6247c47781cc2f
font_01_sfnt_off0000d414.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD414 17108 bytes
SHA-256: 7c8d0fc8dc490d393f1488825f296685a03f7593c58bda1d3bd4506244811ddf

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