Malicious PDF — malware analysis report

Static analysis result for SHA-256 37f20496f566896c…

MALICIOUS

PDF

79.1 KB Created: 2021-03-18 18:31:33 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: a5c8750fb9d05d426117ae72f1382947 SHA-1: 29a25df8cb7a29f1ec9b58084f67df0710ac8c73 SHA-256: 37f20496f566896c50c6aa98d98cbb1bce2f9e76b0ad5d993d0a911e4af37e7c
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The PDF document contains multiple external URIs and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'SE_REMOTE_SUPPORT_LURE' indicates the document likely instructs the user to install remote support tools, a common tactic for social engineering. The presence of embedded URLs and the nature of the heuristics suggest the document is designed to trick users into downloading further malicious content or granting unauthorized access.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://resalured.ru/award?keyword=free+pdf+to+word+converter+download+chip.+de PDF link annotation
    • https://cdn.sqhk.co/buxifuludo/GhgiXKz/pigalopemuto.pdfIn PDF document text
    • http://7lessons.fun/how_to_determine_the_angles_of_a_trapezoido9uxa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426545/normal_603ffe3c6e282.pdfIn PDF document text
    • http://topstop.site/valses_poeticos_granados_guitar8gevn.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403127/normal_604f57ff2892d.pdfIn PDF document text
    • http://wejowadizabudex.mypressonline.com/10144122304.pdfIn PDF document text
    • http://rubeatyshop.xyz/splendor_board_game_arena66pkx.pdfIn PDF document text
    • http://sberbank.link/2479067222183svr.pdfIn PDF document text
    • http://chtotakoevuxom.biz/watiduwagivaxerejizezwfrcz.pdfIn PDF document text
    • http://zunuruxeguxifi.mygamesonline.org/64119348347.pdfIn PDF document text
    • https://cdn.sqhk.co/kexofodatop/j8zohjB/emotional_freedom_technique_online_certification.pdfIn PDF document text
    • http://gonzo-3d.com/how_to_crochet_a_circle_inside_a_squarexyupt.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4488855/normal_602e1ff847e75.pdfIn PDF document text
    • http://budofibo.mygamesonline.org/java_swing_gui_programming.pdfIn PDF document text
    • http://socialwave.me/caso_practico_de_liderazgo0ghfb.pdfIn PDF document text
    • http://tuzogat.sportsontheweb.net/55051127986.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://9f53eded-325d-4e02-8430-7c09bd872488.filesusr.com/ugd/e04405_bc9bd80d7c8e4dff83e754dacc8274b9.pdf?index=trueIn PDF document text
    • https://0ac950e2-707a-4e47-8bf4-daface0ea9db.filesusr.com/ugd/356f11_cbb28edd55274b31ab94fed25af01b81.pdf?index=trueIn PDF document text
    • http://noxukimu.myartsonline.com/class_10_science_question_paper_2020.pdfIn PDF document text
    • https://87b84290-c0b3-4c73-97a1-3d59c64c3f69.filesusr.com/ugd/c638b7_d4f59a897d5048a4b00751365d4de37f.pdf?index=trueIn PDF document text
    • https://cf336f9a-6a79-4542-9269-5b62d6eb69dd.filesusr.com/ugd/1daf83_da9cb504ccbb408db401b7c47cb44e34.pdf?index=trueIn 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_off0000f604.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF604 5204 bytes
SHA-256: ef4e70104cf5bd19de91c38b4994d870a643e74275800f00fbf742a3992934f9
font_01_sfnt_off000107d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D2 11492 bytes
SHA-256: 4c647381e7351c34b4bb34b7182a4f50041412a1d2e59262dd3901f1e5d536ca

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