Malicious PDF — malware analysis report

Static analysis result for SHA-256 24aed80d4f770eec…

MALICIOUS

PDF

74.1 KB Created: 2021-02-18 21:02:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 636dabf39d4fc47d624daaf1ebcd9262 SHA-1: 9635eb943f7169c423b2e36c8d7f4fc811cf017c SHA-256: 24aed80d4f770eec8e50d0becf49a894c70a98fb7841ad1265d567c2277cdbe8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with the heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicating a non-clustered link farm on disposable hosting. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs point towards an attempt to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://bologen.ru/123?utm_term=relative+clauses+game+ks2 PDF link annotation
    • http://medicinfo.online/jejofituzipenorem5dtaw.pdfIn PDF document text
    • https://nukanepinax.weebly.com/uploads/1/3/1/4/131454046/a0eca94c45aaf.pdfIn PDF document text
    • http://astrology-personal.online/xukilaroe5ey6.pdfIn PDF document text
    • http://myyshooop227.site/sizefgsp4s.pdfIn PDF document text
    • http://mirror-x.org/chiari_malformation_support_groups_uk6ai1a.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/22334776406m4a0t.pdfIn PDF document text
    • https://govobozof.weebly.com/uploads/1/3/5/3/135315692/devawavopila.pdfIn PDF document text
    • https://cdn.sqhk.co/tozegatopaxu/Ma224jb/bowling_3d_master_apk_uptodown.pdfIn PDF document text
    • http://lnstgramhelpcopyright.com/88755505296urk3t.pdfIn PDF document text
    • http://arenda-comp.space/watch_forever_my_girl_online_free_127hzqt.pdfIn PDF document text
    • https://cdn.sqhk.co/rureroso/gSlImsO/41841464964.pdfIn PDF document text
    • http://bitcoins-profits.com/lethal_white_galbraithkechu.pdfIn PDF document text
    • http://contact-git.top/544302128090816k.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/dojivewobasuval/dinobojun.pdfIn PDF document text
    • https://s3.amazonaws.com/kumasala/europa_report_trailer_ita.pdfIn PDF document text
    • https://s3.amazonaws.com/kufazete/73470469090.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000da08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA08 3144 bytes
SHA-256: c1b6cc2346db215f1bb370fecda082b642f0c720a5a39cca9f2bcd3b41fe938f
font_01_sfnt_off0000e52a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52A 5284 bytes
SHA-256: b5b85e991ebd2b50be6f8a400ff1f2091a6914a84fc2e3691693416fe107d869
font_02_sfnt_off0000f723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF723 10568 bytes
SHA-256: 4deb8853f728247c2767ed825044b40167b94d48176cecccd5bbabd30da20129

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