Malicious PDF — malware analysis report

Static analysis result for SHA-256 82ee42442f37e7f2…

MALICIOUS

PDF

70.6 KB Created: 2021-03-21 21:22:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: fa481ca516a22d3b955baf1cb3055a2f SHA-1: 890556d645d16ccebae21ecffd587576e64971e3 SHA-256: 82ee42442f37e7f25aa04fb86ddc2934d71de5350dced3dcb9f8e08db03e1566
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://crophysi.ru/123?utm_term=alphabet+big+and+small+letters+worksheet PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4465249/normal_604699986fd65.pdfIn PDF document text
    • http://lukisasore.mywebcommunity.org/dilosumididimezezevi.pdfIn PDF document text
    • http://tokepefanoxite.22web.org/xivosuwofavugodogeret.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499979/normal_60005eecc7c11.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/yamaha_banshee_service_manual_free.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/anqifie/billboard_radio_china_edm_club.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4457847/normal_5fe13a299ac63.pdfIn PDF document text
    • http://rodisawikikofu.medianewsonline.com/jersey_mikes_nutrition_data_tuna.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369626/normal_600ea0d82d9a9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500425/normal_5fdc421519110.pdfIn PDF document text
    • https://cdn.sqhk.co/jalotenabo/jXgiMkp/mulokulokedikebixaxeda.pdfIn PDF document text
    • http://vuzuwul.getenjoyment.net/duwiwijiloto.pdfIn PDF document text
    • http://nojigopagapusu.mygamesonline.org/fundamentals_of_electrical_electronics_engineering.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489244/normal_604cbc6f9cf71.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4443325/normal_5ff529de31f9e.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371013/normal_5fc99aa346555.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pezukovurarugor.rf.gd/telajodafepigujefuvi.pdfIn PDF document text
    • http://suvokejixu.epizy.com/faluwujesufutexevumigapov.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_off0000d67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD67B 5660 bytes
SHA-256: b6a77be48746328958b28a61d1c22d82cd6dee84df0de58c09f2c0e58a391aa0
font_01_sfnt_off0000e996.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE996 10548 bytes
SHA-256: 5c6615f52118ae6470d985472c0242c86e20855c79d037c32e0e1954a3ef518d

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