Malicious PDF — malware analysis report

Static analysis result for SHA-256 60d671338f7d1e5f…

MALICIOUS

PDF

89.0 KB Created: 2021-03-01 13:56:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: cd43ca23bfbe759523a01f9ba7e8007c SHA-1: 3faf5b88a661e43ebe6ede89e57ca283b627a404 SHA-256: 60d671338f7d1e5fe31630bc92a36f1f30ab165c8d1abcc358beb40b887f2e0a
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection mechanism for phishing or malware delivery. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of techniques used to redirect users to malicious sites, likely as part of a phishing or credential harvesting campaign.

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://kuzutuzo.ru/wb?keyword=how%20to%20become%20a%20starbucks%20barista%20trainer PDF link annotation
    • http://ejqy.com/sys_platform_is_not_definedijrpn.pdfIn PDF document text
    • https://cdn.sqhk.co/norumuwapa/gjesVhe/game._tv_download_apk.pdfIn PDF document text
    • http://disconto50.pro/cambridge_checkpoint_science_past_papersj102g.pdfIn PDF document text
    • http://pixell.store/how_far_is_japan_from_australia_by_plane1i1eb.pdfIn PDF document text
    • http://yognat.space/digimon_ruby_rom72oik.pdfIn PDF document text
    • http://shoop-fe.ru/madiganifejuveludehu77.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481662/normal_601e1f59298d6.pdfIn PDF document text
    • http://afracheat6.xyz/what_does_howl_mean_in_hebrewhigdr.pdfIn PDF document text
    • http://lovechat24.club/80359552693h0mxa.pdfIn PDF document text
    • http://skout.tech/44554346167rbxto.pdfIn PDF document text
    • https://cdn.sqhk.co/luwesefizi/eibU418/28987990739.pdfIn PDF document text
    • http://eurosett.net/what_does_god_say_about_conflict_resolutionitf98.pdfIn PDF document text
    • https://cdn.sqhk.co/suvezadamut/gdgcXid/32876915508.pdfIn PDF document text
    • http://vsspb.ru/5908700298737n5v.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369632/normal_5fe6b07308066.pdfIn PDF document text
    • https://cdn.sqhk.co/wareberefiz/iAghBja/hide_and_seek_lyrics_nightcore.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bogalibamadom.myartsonline.com/fadudusojebegu.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_off000120dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x120DD 5172 bytes
SHA-256: 738b1018fda889e44663324c7347d51f7fba3c462bd0c52f8ec8c72d1c47029e
font_01_sfnt_off0001326c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1326C 10564 bytes
SHA-256: 67f97dedb627887149148e5b650534768409044b5d8bcc2ec7365d72858689ec

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