Malicious PDF — malware analysis report

Static analysis result for SHA-256 a32483a0bee9a66b…

MALICIOUS

PDF

78.3 KB Created: 2021-02-15 01:01:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: da24a60d2be6d3053ad64914195a4a70 SHA-1: a325b74d57c26b2190c30eca2f5dad25be467723 SHA-256: a32483a0bee9a66b8eb44e1ae23b1a2657e7c3ac27ad407541f038923b557f5b
126 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many pointing to disposable hosting and link farms, suggests a phishing or malware distribution scheme. The document body, though heavily obfuscated, contains metadata related to search keywords and PDF generation, reinforcing the lure of a search result or document download.

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://baarspo.ru/wix?keyword=william+s.+burroughs%2527+the+revised+boy+scout+manual+pdf PDF link annotation
    • http://theplafond.xyz/74862071104hkds8.pdfIn PDF document text
    • https://cdn.sqhk.co/joxomawezu/ttIhijc/fafosigidufatubatupaviso.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500446/normal_6002e43f40bea.pdfIn PDF document text
    • https://cdn.sqhk.co/numokafas/qii5jg3/sword_art_online_wallpaper_4k_hd.pdfIn PDF document text
    • http://reform-st.ru/biological_classification_ncert_downloaduxthc.pdfIn PDF document text
    • http://hookup157.site/it_security_manual80ov1.pdfIn PDF document text
    • https://cdn.sqhk.co/papusabefo/gcjbIjd/ketomaburufo.pdfIn PDF document text
    • http://milansit.space/hp_blackberry_android_2019dst8e.pdfIn PDF document text
    • http://train-home.ru/59229524258p9w2j.pdfIn PDF document text
    • http://frankiearvelo.com/74695373537e2ica.pdfIn PDF document text
    • http://phrensy.co/vulisorarituxiluvuzebrzxe1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4427093/normal_5fdd340d781c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480584/normal_60102cf548bc1.pdfIn PDF document text
    • http://lirelejavebot.iblogger.org/86449794541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366028/normal_601563674581c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502819/normal_5fe785e1bdfcb.pdfIn PDF document text
    • http://lisolu.org/87145823453ohe5k.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000f3a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3A7 5952 bytes
SHA-256: 1f8047709828b1bb357591c2ae67505b047ef8a06fd5ae584ee01e8773576ae4
font_01_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 10364 bytes
SHA-256: c6be046381d24215c6dc3fb3b56de4f1a082f135fe44c863326c8c3f50dd8ff5

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