Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff35553a3f736753…

MALICIOUS

PDF

93.8 KB Created: 2021-03-23 16:11:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-02
MD5: 4e77a2d75c7cc4b56d27d45745f5cad6 SHA-1: 52d68e44b8d8b680deed13ce42eaa83c6b40fcbe SHA-256: ff35553a3f7367533997218d9b2ceb95142f6c4253bd59dd895909db37b654f7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs, many of which point to suspicious domains and are flagged as potentially malicious or unknown. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. The presence of external URIs and the overall structure suggest the document is designed to redirect users to malicious sites, likely for credential harvesting or further malware delivery.

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/award?keyword=cellular+basis+of+immunity+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4380237/normal_5fee4bb2b87ce.pdfIn PDF document text
    • http://segway-wheelchair.ru/the_things_we_carried_quotesdgm5k.pdfIn PDF document text
    • http://dreabling.online/monutubisrcgpx.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413228/normal_60228a993ac79.pdfIn PDF document text
    • http://ulekschool.online/jegujugigamujon77hja.pdfIn PDF document text
    • https://cdn.sqhk.co/wujejelot/gFhtGji/vidijilelawojetotevo.pdfIn PDF document text
    • http://kapusta.pro/99588068609tc60m.pdfIn PDF document text
    • http://usecabinets.xyz/which_term_or_phrase_does_not_belong_in_this_list_of_characteristics_describing_acidsw8ckh.pdfIn PDF document text
    • http://omoikiri.info/mein_aldi_talk_app_apk76in6.pdfIn PDF document text
    • https://cdn.sqhk.co/wawabosamugo/hajfZjc/android_app_development_course_for_beginners.pdfIn PDF document text
    • http://zobebukore.22web.org/cuneiform_definition_facts.pdfIn PDF document text
    • http://razvivatel.blog/783832393468c4cz.pdfIn PDF document text
    • http://vehicleinsusa.com/57297008444hnl6h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406229/normal_60322ad926729.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/022f47f8-bc3e-47ed-a896-6a6dab6f3b73/2020_lexus_rx_350_dimensions.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7b77a75b-072d-4ce1-af0e-da16d547a813/big_blue_live_2.0.pdfIn PDF document text
    • http://tujiritam.epizy.com/pibatonilizi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8931bcf4-95c4-4343-a092-588a5c24c459/burger_king_menu_mexico_city.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d20d14a-b8d3-46fa-ad89-fa98fb5903a7/after_we_collided_film_music.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_off00013198.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13198 5332 bytes
SHA-256: 25dbd18c55973a918cba28330308422579c189209926b047902260b05a9fd7d6
font_01_sfnt_off000143a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x143A5 11388 bytes
SHA-256: d84ff0310dab09db832782228969db391749478ee870c6c5f9d156ed2ae8664e

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