Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6cbaf2e7d92e3d4…

MALICIOUS

PDF

71.5 KB Created: 2021-02-19 19:00:41 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 721f5c92dc4726dc3e89b95c6e3ce223 SHA-1: 54ab7c16ce1d8de3583d603d8bbc542d7cf47406 SHA-256: a6cbaf2e7d92e3d4141540035540655f1db303ecc97883b175ea7a4864690165
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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
  • 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://bologen.ru/123?utm_term=easy+chess+puzzles+with+solutions PDF link annotation
    • http://opt15.ru/who_guidelines_for_drinking-_water_quality_tdsa30rn.pdfIn PDF document text
    • http://grigolia-studio.ru/diono_radian_3qxt_reviewsexn1e.pdfIn PDF document text
    • http://detonic-ufficiale.website/sefudexixukerajapogofg1y62.pdfIn PDF document text
    • http://scarcebook.com/42103466150bxrem.pdfIn PDF document text
    • http://velesvoyage.ru/driver_booster_4._4_license_key5efev.pdfIn PDF document text
    • https://kuvukodu.weebly.com/uploads/1/3/1/4/131453249/tigowexubekad.pdfIn PDF document text
    • http://hookup682.site/6279568228l95ul.pdfIn PDF document text
    • http://arendaavto.taxi/lepelejiromusawugoferuvrsvln.pdfIn PDF document text
    • https://cdn.sqhk.co/jasurisunav/jym2giE/stormbound_kingdom_wars_mod_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/fabozesemi/euYmAjd/christian_songs_about_answered_prayers.pdfIn PDF document text
    • http://mmmmmme.space/62532034240160hs.pdfIn PDF document text
    • http://ita-bio.space/41538970084sqj7v.pdfIn PDF document text
    • http://dragonflysagewellness.com/duraheat_dh2304_indoor_kerosene_heater44ti0.pdfIn PDF document text
    • http://milansit.space/kurutisawuguvavalabownmw3p.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/boxujetanonikuv/calendar_design_software_free.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://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dc48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC48 5124 bytes
SHA-256: bbb6483409d977369d03ffe80cbecef1d7ad43c375641ac6e9009ae704baabdd
font_01_sfnt_off0000edde.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDDE 10272 bytes
SHA-256: 10a6b458bd43cdb7b0658e5e732d960e7de2e4c86606333d778fe5d586ca9712

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