Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fd1df53f3d8a809…

MALICIOUS

PDF

69.8 KB Created: 2021-03-19 14:01:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 534e38496f33ce179066f56ab95b4496 SHA-1: 96a4136e33e13b2eaa00e8b81be488e185f72dd9 SHA-256: 5fd1df53f3d8a8092ff8bd2e6e163010f9ccf10087725bf662ec77673391ed7d
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://zajinet.ru/award?keyword=scales+and+arpeggios+for+trumpet+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4383136/normal_60049a9e09ffe.pdfIn PDF document text
    • https://cdn.sqhk.co/lowilufape/PjelhfI/zowevewitelisilinizexuz.pdfIn PDF document text
    • http://fekabonan.22web.org/krapps_last_tape_summary.pdfIn PDF document text
    • https://cdn.sqhk.co/sopiloroda/jdhgphh/pocket_tanks_deluxe_apk_all_weapons_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425217/normal_60185f1d2ca11.pdfIn PDF document text
    • https://cdn.sqhk.co/vebudirepo/hsoRnaC/fujetit.pdfIn PDF document text
    • http://wisecredit.info/3967475013706o1d.pdfIn PDF document text
    • http://lidujer.22web.org/autocad_civil_3d_tutorial_for_beginners.pdfIn PDF document text
    • http://korsabarca.com/7354266918118wh1.pdfIn PDF document text
    • http://legendbilisim.com/425180989257aywe.pdfIn PDF document text
    • http://bonmarket.site/what_caused_the_90s_economic_boomkhdlq.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zosubimonoz.rf.gd/dolitonoputikir.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6bba8464-897d-4aba-ad54-fcb073661f82/wolf_game_studio_wasabi_download.pdfIn PDF document text
    • http://numodonodepo.epizy.com/88959756993.pdfIn PDF document text
    • http://wetedezowob.rf.gd/reliability_centered_maintenance_moubray.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8f6fa8fc-ab5d-4180-a5e3-bbde864957a8/can_you_do_a_live_stream_on_google_classroom.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed55ddab-101d-40e7-a8ea-371e39d48a85/how_to_install_drum_kits_fl_studio_20.pdfIn PDF document text
    • http://kevawiposiwa.rf.gd/4181409164.pdfIn PDF document text
    • http://beninoduvewer.epizy.com/libro_azul_coda_gratis.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_off0000d007.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD007 5580 bytes
SHA-256: 744a62fbe720848cde54f124675b997becc054c131c8e347880398ee466910c3
font_01_sfnt_off0000e2f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2F2 10932 bytes
SHA-256: beadae551872bcf7b33146bc4352fbbc1735aa754d64ff77c325e4a500d6fbf8

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