Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4dd8e0a3ce0b84a…

MALICIOUS

PDF

78.1 KB Created: 2021-03-14 05:52:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 773060fcfea92c495088263c3d138b18 SHA-1: 293ed358f8ef82942b426711cc9b5baa27e98c66 SHA-256: f4dd8e0a3ce0b84afa5e3a15dacd4f7a66ffef8c245c355166cd187ecc636e49
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://baarspo.ru/strik?utm_term=the+power+of+one+chapter+18+summary PDF link annotation
    • http://xipukob.22web.org/leruxidasopetomuv.pdfIn PDF document text
    • https://cdn.sqhk.co/jivonaxadu/dLpoN8E/59180393530.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374372/normal_6046308d24d19.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418399/normal_5fca66ca93942.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4391303/normal_6039a1f138973.pdfIn PDF document text
    • http://biribekagupelu.66ghz.com/colors_tv_live_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/kisusonulata/QhhqQig/fagoluvidobatavukow.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453889/normal_600a8c68007fb.pdfIn PDF document text
    • https://cdn.sqhk.co/lufelumad/g8B46jj/47318819237.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxofabope/ggjjhc2/brick_breaker_game_online.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4417312/normal_5ffcb89741c15.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://punexowimuseva.epizy.com/bink_sake_piano_sheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/637d2d52-b01f-481d-a16a-ed4b41f20fb2/pevokazojib.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4bcb0aa0-6363-464b-8c68-aeb1bf2fb69e/watsons_go_to_birmingham_chapter_12.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6480bee-6362-4ef2-ab60-7a7ad35513e5/linebacker_drills_and_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5bc6bb07-1f39-41cc-97ae-9453e22d40ff/full_quran_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc68a666-ce73-498e-8d14-c4f9fa872390/likumuxugemetije.pdfIn PDF document text
    • http://sidegiri.epizy.com/rovowixisixawosiga.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_off0000e6ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6BA 5448 bytes
SHA-256: 23a63cd14292209385a63ab7f2e000a6dd121d77866773cd8b42a21da37f9027
font_01_sfnt_off0000f92d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF92D 10436 bytes
SHA-256: d167d9d82b71353e64d77d990144e28779d3fbbf48ed8b1c36c5666aa5b27098
font_02_sfnt_off00011cfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CFB 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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