Malicious PDF — malware analysis report

Static analysis result for SHA-256 9a58d9e287d666bc…

MALICIOUS

PDF

91.9 KB Created: 2021-02-17 10:03:00 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5bab18aaac66ffb53944a891e2735833 SHA-1: 14c7d3eb07641c6ce34ba150b8315d82eaf505b0 SHA-256: 9a58d9e287d666bc50591ac58520cd0e62d1a5a2778976aa61402f95d2dd08c2
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by a machine learning classifier and ClamAV as malicious, specifically as a phishing trojan. The presence of numerous external URIs, many hosted on disposable domains, indicates a link farm designed to redirect users to malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, identifying the sample as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://maypoin.ru/wix?keyword=sausage+party+drive+mp4 PDF link annotation
    • https://vujojetusifej.weebly.com/uploads/1/3/1/3/131398487/14ee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413845/normal_60293a90073ba.pdfIn PDF document text
    • http://roxopazin.iblogger.org/baking_sheet_parchment_paper.pdfIn PDF document text
    • https://tivubolo.weebly.com/uploads/1/3/1/8/131857038/1329361.pdfIn PDF document text
    • https://gixobuwek.weebly.com/uploads/1/3/2/8/132815317/9458876.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460457/normal_5feb4671e5321.pdfIn PDF document text
    • http://kijorifoweb.22web.org/gutepo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404297/normal_601e86fbeb0ab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4392199/normal_5ff69f2b41d78.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494681/normal_600a3e16e4b1c.pdfIn PDF document text
    • https://cdn.sqhk.co/papazokixe/6hghhMD/13322113886.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404123/normal_5fe45ab3b41e2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385213/normal_601f5918e6584.pdfIn PDF document text
    • https://cdn.sqhk.co/sasibasodiwu/jbbLgdG/sales_book_template.pdfIn PDF document text
    • https://pelepidavivi.weebly.com/uploads/1/3/1/4/131454492/sobefowef_jarutiga_rerumeja.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://desavoz.epizy.com/bringing_embodied_carbon_upfront_report.pdfIn PDF document text
    • http://riwugenesujo.epizy.com/a_level_economics_notes.pdfIn PDF document text
    • http://vaxesopubowutuf.rf.gd/wwe_smackdown_vs_raw_2011_apkpure.pdfIn PDF document text
    • http://vejidot.epizy.com/3710663558.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000112df.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112DF 5600 bytes
SHA-256: 2ff4207bfa2682fe372a1f52126385c0a6cff906b47f7aaf5472f560644ea50f
font_01_sfnt_off000125eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x125EB 11424 bytes
SHA-256: e08eb2e0619e68316f3f23c4a0b90ed60255e722f10aa33e93b4bc7298884bef
font_02_sfnt_off00014c75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14C75 16384 bytes
SHA-256: 5254ee2c843993a6a7e622a6ae4d062604426df6ab3f4153ea3d5691bcfd9f38

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