Malicious PDF — malware analysis report

Static analysis result for SHA-256 d6b3a31732c6b18f…

MALICIOUS

PDF

79.0 KB Created: 2021-03-30 11:15:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 5f2a789f6967daa71e4144c7f88edc83 SHA-1: 975db128d67bd27e2d630dd50ef236e1e25ed2db SHA-256: d6b3a31732c6b18f6cd5a69af8e371e1c49bc411b9c7981b1e110095a00091a0
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9778

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 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
  • PDF differential parser failed info PDF_DIFFERENTIAL_PARSE_FAILED
    The cross-check parser (pdfminer.six) failed on this file: PDF differential parser failed: PDFSyntaxError. Static heuristics still ran and any of their findings above are valid; only the differential cross-check signal is missing.
  • 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://maypoin.ru/award?keyword=triptico+sobre+alimentacion+saludable+pdf PDF link annotation
    • https://bojuwidus.weebly.com/uploads/1/3/4/6/134698781/tonugatuzobakus_wofizimulaf.pdfIn PDF document text
    • http://medilawibume.scienceontheweb.net/bl_theraja_volume_1.pdfIn PDF document text
    • http://timinome.getenjoyment.net/gujunivafuriwawa.pdfIn PDF document text
    • https://tiletemilowa.weebly.com/uploads/1/3/2/7/132710791/muparo.pdfIn PDF document text
    • https://kilizilefepik.weebly.com/uploads/1/3/0/7/130775254/kuborenivotevuba.pdfIn PDF document text
    • https://gawudizilox.weebly.com/uploads/1/3/5/3/135300959/8078443.pdfIn PDF document text
    • https://nuwusiran.weebly.com/uploads/1/3/5/3/135321198/juzemukimo_sexufokazo_vadomome_letap.pdfIn PDF document text
    • https://gakujoxabusu.weebly.com/uploads/1/3/5/3/135394689/1537494.pdfIn PDF document text
    • https://fiwerabonu.weebly.com/uploads/1/3/4/3/134347662/wuferewi-xepaxawi-mosaxizetawunew.pdfIn PDF document text
    • https://jevakotimafunu.weebly.com/uploads/1/3/4/8/134878594/7604614.pdfIn PDF document text
    • http://fontawesome.iohttp://fontawesome.io/license/In PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45ed8376-e832-497f-ab20-0a31924dc5db.filesusr.com/ugd/4b7290_e8d95101ec964d14b742076d440762f8.pdf?index=trueIn PDF document text
    • https://9f349447-249b-4747-956a-316fe86e371b.filesusr.com/ugd/d2b720_7f727a5eefd749beb88d681b2fbab9b3.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tamovagag/19420334133.pdfIn PDF document text
    • https://s3.amazonaws.com/liluvad/badminton_history.pdfIn PDF document text
    • http://vegubom.atwebpages.com/86868586307.pdfIn PDF document text
    • https://a146b927-ed54-472d-b3a8-6b137e313b92.filesusr.com/ugd/4d400c_dc09cde22d094d098165f5d3e3208f86.pdf?index=trueIn PDF document text
    • https://393102e6-89af-4738-8cad-89662dba8dc5.filesusr.com/ugd/33a16d_9e6c8e78b8bf4d288afe13174dc15b6d.pdf?index=trueIn PDF document text
    • https://ebba3e40-d49f-4cc8-b137-373bb1124918.filesusr.com/ugd/384ea4_afe720cfbae94946935108f6fdfa85a7.pdf?index=trueIn PDF document text
    • http://kagijido.myartsonline.com/french_verb_conjugation_table_prendre.pdfIn PDF document text
    • https://e5baaea7-7007-41de-9367-4ebf3ed55875.filesusr.com/ugd/8e1900_00b2cb4384824cf2899490d95b45512b.pdf?index=trueIn PDF document text
    • https://04934832-22f3-474e-96de-b9d593e92251.filesusr.com/ugd/f390e7_40a7903e919a4abaa3f99253985493f1.pdf?index=trueIn PDF document text
    • https://c145ee04-3c3b-4786-8b94-e0511401b322.filesusr.com/ugd/de65f7_6e5b2717a51b4f05999b7010ececdd7d.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fizaxo/furapatonobevewutidezib.pdfIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f524.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF524 1528 bytes
SHA-256: 64d53b4318ba7dc869bcefe2c6c56431e6e12bcaf96a32242cfa9e17b755ba3b
font_01_sfnt_off0000fcec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCEC 5392 bytes
SHA-256: 241ffd06acca7dfa8fafd4d286bba1eec177472352971efd42f224ca9271124f
font_02_sfnt_off00010f1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F1D 12680 bytes
SHA-256: a1a95336a414f29f051841d98a7e73bf415dc131a97a3e60eec79ea0c6642145