Malicious PDF — malware analysis report

Static analysis result for SHA-256 88fdb6f180a28954…

MALICIOUS

PDF

77.8 KB Created: 2021-02-21 10:28:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: d49904f95b9b727c4b637144c5d1674b SHA-1: 5ec31a5343b34f6e1cf042b66152ae9e594769e2 SHA-256: 88fdb6f180a289545a2e7b455bc6bbb4e9f5d60ad8a91a7fb70cddc4c1d6fd93
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 0.9998

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://maypoin.ru/wix?keyword=parallel+keys+list PDF link annotation
    • http://trynutra.shop/robadagixigaxemurotekv7r.pdfIn PDF document text
    • https://cdn.sqhk.co/nakunadubux/Qfghvge/49096083655.pdfIn PDF document text
    • https://pelosewedi.weebly.com/uploads/1/3/4/7/134753512/tawuwefebenu.pdfIn PDF document text
    • https://cdn.sqhk.co/fapetemiji/hegc2mu/sup_game_box.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4411481/normal_600689639910c.pdfIn PDF document text
    • https://pananufizusa.weebly.com/uploads/1/3/4/4/134445813/6749349.pdfIn PDF document text
    • http://scoretdho.best/erythropoietin_anemia_guidelineskcgqi.pdfIn PDF document text
    • http://ing-jobs-opportunities.com/woman_on_top_nancy_friday_read_onlintdzir.pdfIn PDF document text
    • https://porovepo.weebly.com/uploads/1/3/4/5/134527374/7163552.pdfIn PDF document text
    • https://cdn.sqhk.co/povuguzuloga/zuyifgj/paypal_customer_service_email_address_usa.pdfIn PDF document text
    • http://kostlike.site/19283999683zpkhq.pdfIn PDF document text
    • https://gimiduti.weebly.com/uploads/1/3/4/7/134711596/fa588a0.pdfIn PDF document text
    • http://bionatur.space/wretched_of_the_earth_preface_summary5lp7n.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • http://silirik.rf.gd/jabigemogagozutobigemoz.pdfIn PDF document text
    • http://zaximibirada.epizy.com/32857507937.pdfIn PDF document text
    • http://viwuleraxukopiz.epizy.com/two_circle_venn_diagram_template.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_off0000ea0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0E 4420 bytes
SHA-256: 72a4a5f8a922b5e9689c81b899f924a57a2883298c16609881e4c0b45780dd58
font_01_sfnt_off0000f916.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF916 10304 bytes
SHA-256: e0dfa5ddc35bba05fb2854a6baf6a1da030d43112e3da3c211c5f23e57dc950c
font_02_sfnt_off00011c64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C64 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3

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