Malicious PDF — malware analysis report

Static analysis result for SHA-256 c4d40e51db147886…

MALICIOUS

PDF

81.2 KB Created: 2021-05-05 16:10:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5b6279edbad13c6fd8e91317c4d53dfb SHA-1: 90fc17ab8bd356808a977b0cba3460f611af46ba SHA-256: c4d40e51db1478868e6fea95295479bf5b5783a14b3301e0c3b9b499fad75aa8
126 Risk Score

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 0.9990

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://fokemale.ru/strik?utm_term=wagner+place+hotel+dearborn+mi PDF link annotation
    • http://i12tws.website/gujopuxogonevorinegowajon9a5tc.pdfIn PDF document text
    • http://mixed-rootwork.com/britain_s_got_talent_poster_templatelralj.pdfIn PDF document text
    • http://kujotisokuvo.iblogger.org/berliner_platz_3_neu_download.pdfIn PDF document text
    • http://qlemelest.online/8816467867wlnrz.pdfIn PDF document text
    • http://shoop-fr.ru/disibitazijajogozovusb0e29.pdfIn PDF document text
    • http://shop-you.xyz/nakudigamemebasozeka29s1.pdfIn PDF document text
    • http://ens-pictures.ru/apidra_dosage_form0e21n.pdfIn PDF document text
    • http://maxapur.22web.org/talupumapulupavaroripi.pdfIn PDF document text
    • http://vovadinajop.iblogger.org/how_to_write_a_book_report_5th_grade.pdfIn PDF document text
    • http://help-lnstagram-verifycopyrgiht.com/83853472968pgx18.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kaluzepo.rf.gd/cookie_and_friends_starter_class_book.pdfIn PDF document text
    • https://c2bc7a71-cb21-434c-84f6-8d2fc09ed56d.filesusr.com/ugd/03ae60_f772af949a834d6f8203fff461f55237.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddd7715e-94bf-4f7d-b264-1a1b0e0126e8/stryker_sr-655hpc_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9d61e586-dd4d-472f-806b-ee5fda19b7fb/can_you_steam_pasta_instead_of_boil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5a37139-850f-43db-8304-b02f0e01cb17/love_does_bob_goff_discussion_questions.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_6f6fcecd7092416fa345915ab6e8be11.pdf?index=trueIn PDF document text
    • http://tirujukixiw.epizy.com/92814465028.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9409b33b-ebff-417e-affd-58c5399f4479/cateye_cc-mc100w_price.pdfIn PDF document text
    • http://guxajofiv.epizy.com/structured_problem_solving_techniques.pdfIn PDF document text
    • https://cf176ec6-4820-456b-adf9-61e5f06c968f.filesusr.com/ugd/43d598_a380685fd83f4b55b875a70e7c86c15d.pdf?index=trueIn PDF document text
    • http://gazezubutajon.rf.gd/24783731908.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/37e295a5-b553-4800-af18-765796e482d8/logical_reasoning_math_questions_and_answers.pdfIn PDF document text
    • https://83372c7a-1065-4b07-8284-b64562b46e84.filesusr.com/ugd/035489_edc12c21c4c848eaa8603eb9d40a7386.pdf?index=trueIn PDF document text
    • http://pugunefa.rf.gd/popofofatetemije.pdfIn PDF document text
    • http://ferizitemimov.epizy.com/s_chand_biology_book_class_10_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_off0000fd11.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD11 5464 bytes
SHA-256: e0bc42ae1f0c78ffe304f0f1c5f04a77619db77e93b07bc529852b64765d8024
font_01_sfnt_off00010f82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F82 11316 bytes
SHA-256: a6baee16bdf8ac4d808a92aea0099b5a49620fa7e6762f1d6cc990dc0e7a367a