Malicious PDF — malware analysis report

Static analysis result for SHA-256 9bc4e693831b4c16…

MALICIOUS

PDF

70.5 KB Created: 2021-02-19 13:37:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 326733d273b033f222ba42306e8ddc25 SHA-1: 9b80fc97e7fa22e8c6c3bd985614a777d6d479b3 SHA-256: 9bc4e693831b4c1651c48e283c9baef4e9e97f765cb4f3e4e603c01bbb2d4913
126 Risk Score
Tags
free-cdn-ebook-manual-lure

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 0.9997

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 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://jottigo.ru/wix?keyword=landlord+letter+to+tenant+to+vacate+ontario PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4467912/normal_600ed2af207bd.pdfIn PDF document text
    • http://zoneeuro.pro/dobavcyoie.pdfIn PDF document text
    • http://itwomen.space/best_powerpoint_template_lucu_freeu9bhq.pdfIn PDF document text
    • https://cdn.sqhk.co/zubavagi/FWeiajc/zenuvofuvazi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443799/normal_5fcc453270760.pdfIn PDF document text
    • http://shoop-fl.ru/download_sculpt_mod_apk_traffic_riderhahdw.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383464/normal_6014a0843c923.pdfIn PDF document text
    • http://vinnipoh.fun/pibisozifasefomudazaxubuq8wje.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/lusabifef/81536925941.pdfIn PDF document text
    • http://setonan.rf.gd/how_much_does_it_cost_to_have_a_cortisone_injection_privately.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/bajana_songs_telugu_audio.pdfIn PDF document text
    • https://s3.amazonaws.com/forupokisip/jovisoj.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_off0000d80f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD80F 4756 bytes
SHA-256: 5273a2ab1e0bca8b889c241c0d0fb7efb9c86bfecf02a1902a5e5d0ddad5f378
font_01_sfnt_off0000e855.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE855 10872 bytes
SHA-256: ca1315f84e2c666d26d28f18374271d22640fb604c0827161657a1981f66aa39

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