Malicious PDF — malware analysis report

Static analysis result for SHA-256 68801c4ec8572596…

MALICIOUS

PDF

63.9 KB Created: 2021-06-11 13:22:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 50770a3c8e7a22d63827ff0ebe276b4a SHA-1: 9f00556cee86aa0747e2ea28d238728be7cc5ec3 SHA-256: 68801c4ec857259613ee0ef299f9f6016b6ca033a6809751f96850191bb66088
184 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, many pointing to disposable hosting, suggesting a link farm designed to redirect users to malicious sites. The document body, though heavily obfuscated, indicates a lure related to 'Hachiko reading comprehension pdf'. No scripts were extracted, but the presence of numerous external links strongly suggests the document's primary purpose is to redirect users to potentially malicious content or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9636

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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://oniceh.ru/pbw?utm_term=hachiko+reading+comprehension+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4459929/normal_5fe0f6f5cebba.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4409798/normal_5fc7ebdd09bca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461516/normal_6061f669111d7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391326/normal_6067bbf29b59e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459055/normal_605a650718329.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417426/normal_600ae3005fb2c.pdfIn PDF document text
    • https://vawanateriti.weebly.com/uploads/1/3/0/9/130969814/lukuzosad.pdfIn PDF document text
    • https://jaroxifapo.weebly.com/uploads/1/3/1/6/131636664/8277f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446015/normal_5fd7ce9020627.pdfIn PDF document text
    • https://gipurafesab.weebly.com/uploads/1/3/1/6/131637457/rexogibixunebu-gedomogewagola-nifirazo-monovefozav.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4485568/normal_5ffc1df02d54b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502336/normal_5fd28259105da.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://deduxofevit.pbworks.com/w/file/fetch/144680889/filmywap_south_indian_movie_2018_free_download.pdfIn PDF document text
    • http://jorowad.pbworks.com/w/file/fetch/144835206/sorizusisonefi.pdfIn PDF document text
    • http://ravaxes.pbworks.com/w/file/fetch/144893982/wadipudatuwit.pdfIn PDF document text
    • http://vulazojab.pbworks.com/f/placa_me_ipm31_drivers_win_7.pdfIn PDF document text
    • http://bujolajoxek.pbworks.com/f/principles_of_microeconomics_mankiw_test_bank.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f70b7f39-9731-4955-9e31-f475f207553d/apple_tv_have_hbo_max.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1653f44e-45cb-4e74-9d93-9ac02c489133/gigizu.pdfIn PDF document text
    • http://gozuwef.pbworks.com/w/file/fetch/144518535/why_does_hydrogen_peroxide_have_no_smell.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 5560 bytes
SHA-256: 293b3992878187d3bc250a5ed4b146047be7f3260da6fb56f353cffb38752751
font_01_sfnt_off0000e131.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE131 10356 bytes
SHA-256: 697c5f7f3cebe047e30b4770e2670ddd4c61ae1f629d1cbb2db59d77d4786991

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