Malicious PDF — malware analysis report

Static analysis result for SHA-256 d1fa0f7ece51b939…

MALICIOUS

PDF

70.5 KB Created: 2021-06-06 17:06:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: c06ef7f6c7f9f3db435e8e35ce7a5fc6 SHA-1: ec391a78ab3843a192d9e98887da8c105448ba7f SHA-256: d1fa0f7ece51b939cb911aaef199439d264b8b99b2ea5456575eb4d20b9f8d54
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 0.9996

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://cructi.ru/pbw?utm_term=exponent+rules+word+problems+worksheet PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4377938/normal_5fff64d2da16b.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4470402/normal_60b6de92447b0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369908/normal_5fcad74238742.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366344/normal_5fd03fb0498d3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dipoziw.pbworks.com/f/37254378031.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/76ff7360-9d82-4f1d-98d0-7a884db941ce/do_i_need_to_add_water_to_my_electric_smoker.pdfIn PDF document text
    • http://jeselivid.pbworks.com/w/file/fetch/144573303/pte_academic_book_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57695eb9-2340-414b-b850-841e4ec1124b/air_force_academy_football_roster_2018.pdfIn PDF document text
    • http://biwonuv.pbworks.com/w/file/fetch/144596412/zikugutoxowixunagajigumuw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3fcd6517-70fb-4dd6-be41-419ee661ee3f/faboj.pdfIn PDF document text
    • http://kafunujazuwo.pbworks.com/f/how_long_can_you_leave_splat_bleach_on.pdfIn PDF document text
    • http://padimagofo.pbworks.com/f/20060925548.pdfIn PDF document text
    • http://visetululiv.pbworks.com/f/how_to_put_two_quotes_into_one_sentence.pdfIn PDF document text
    • http://xalomuzavege.pbworks.com/f/57624629735.pdfIn PDF document text
    • http://zizovitunex.pbworks.com/f/15776313274.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13ff0253-3782-44db-a122-a58975dc3485/campark_trail_camera-wifi_20mp_1296p.pdfIn PDF document text
    • http://nijominem.pbworks.com/w/file/fetch/144709839/7786061757.pdfIn PDF document text
    • http://siwuromo.pbworks.com/w/file/fetch/144425118/krispy_kreme_donut_holes_nutrition_information.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c58f463a-c212-442d-933c-5418ae45cdc6/treasure_island_hardcover_book.pdfIn PDF document text
    • http://vikiruji.pbworks.com/f/79607882087.pdfIn PDF document text
    • http://jilawuxifi.pbworks.com/w/file/fetch/144659262/madowodiwikodize.pdfIn PDF document text
    • http://wabiwepakeg.pbworks.com/f/tanu_weds_manu_returns_full_movie_hd_720p_free_download.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_off0000d661.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD661 5308 bytes
SHA-256: 1abb527509cabb4126b8775aca1a44ba34cb330d84f032c33a43ca2196ff6728
font_01_sfnt_off0000e857.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE857 10516 bytes
SHA-256: 77ac0e0808ccb2d55f965e4ff24b7b70ebcd2e332b3b21b86bba884b1e809e3e

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