Malicious PDF — malware analysis report

Static analysis result for SHA-256 b513baa0ece0eef7…

MALICIOUS

PDF

79.9 KB Created: 2021-03-27 20:44:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ac3e4f2195843fc580ae196b4a164000 SHA-1: 56eea3526d655d1a41483e8002652a03dc56406f SHA-256: b513baa0ece0eef78837cdf84f75e4d22691763f957cdb1c88eb723d80e0d8f2
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://xajibur.ru/wix?keyword=mitosis+and+meiosis+worksheet+high+school PDF link annotation
    • https://cdn.sqhk.co/mivoteloxip/6lvjhVG/27140927438.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401703/normal_5ff12fe220545.pdfIn PDF document text
    • http://daludaja.getenjoyment.net/70527560158.pdfIn PDF document text
    • https://cdn.sqhk.co/pigujoxexate/ghgBEif/beautiful_wallpaper_download_mp3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421637/normal_6014574f4b04b.pdfIn PDF document text
    • http://jebebixazonutug.mypressonline.com/83703301616.pdfIn PDF document text
    • http://ramifapufebi.scienceontheweb.net/zikijibipujavijojote.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452193/normal_5ffa5678d6cbe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413462/normal_6056cf8d0b8b9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374518/normal_601295b79587b.pdfIn PDF document text
    • https://cdn.sqhk.co/kigowabalo/jhgiKpx/e-_scooter_city_rider_5_green.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423188/normal_5fc8f0ff18d8f.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nakarajibap.myartsonline.com/alcoholismo_en_guatemala_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0244a33-bee4-48b2-9adf-2a2b85c6900c/kodak_esp_office_2150_printhead_carriage_jam.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d27b30-616f-4498-bab5-8779dee29d25/39836397809.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e10f2f47-0f11-4f79-ae60-f91e12261c01/42692613949.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c01f1886-c797-4f20-9017-4e1b0f473a2d/samsung_55_inch_curved_4k_ultra_hd_smart_tv_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a6329199-6da4-42cd-96a1-86b0d402a953/remixekewunopeno.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_off0000f876.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF876 5512 bytes
SHA-256: 335625f9aea0eb8a18d9774cf6c4b1ad562c914f0a4dcade179c050a63a923e3
font_01_sfnt_off00010b27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B27 11076 bytes
SHA-256: de52dd4d69870a5219e957f920f2393567df5158926eac6155ad7d72148e8d1f

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