Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b38f3dff04ec3f7…

MALICIOUS

PDF

76.5 KB Created: 2021-03-27 15:41:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a5b5a744d61ed026260ddb89572050e6 SHA-1: 96d16c3c7d42b2e64fa2279dce266ce797852f2d SHA-256: 9b38f3dff04ec3f7d260ef409e15f55493c13c9f6c61ab973b8c3acb6ebdca19
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 0.9997

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://dafemum.ru/strik?utm_term=lego+avengers+infinity+war+thanos+gauntlet PDF link annotation
    • http://psylath.com/what_kind_of_oil_does_a_grasshopper_mower_usef3iao.pdfIn PDF document text
    • http://suzofovolavuk.scienceontheweb.net/what_are_the_different_types_of_framing.pdfIn PDF document text
    • https://cdn.sqhk.co/wuvitatutuv/gjLjddZ/20360676893.pdfIn PDF document text
    • https://cdn.sqhk.co/bapuxilav/gfjsGIc/download_call_of_duty_mobile_garena_apk_uptodown.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4468823/normal_5fea45b6c3246.pdfIn PDF document text
    • http://zimezobot.getenjoyment.net/how_to_use_smartparts_digital_picture_frame.pdfIn PDF document text
    • https://cdn.sqhk.co/xidafigutoxa/Sgd3jjQ/jio_recharge_free_mobile.pdfIn PDF document text
    • http://gidujoluj.mypressonline.com/partner_wod_crossfit_meaning.pdfIn PDF document text
    • http://axecheat5.xyz/403851327297ne4i.pdfIn PDF document text
    • http://carinsusa.info/spectrum_math_workbook_grade_8_free92cvz.pdfIn PDF document text
    • https://cdn.sqhk.co/lezebulodiw/hbhjhhO/amazon_prime_filme_kaufen_gutschein.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426409/normal_60144366df296.pdfIn PDF document text
    • http://masito.space/12283476525rwlc5.pdfIn PDF document text
    • http://zunewibozoxug.iblogger.org/abit_ip35_pro_drivers_windows_10.pdfIn PDF document text
    • http://itdomen.fun/the_maze_runner_3_age_ratingh50xz.pdfIn PDF document text
    • https://cdn.sqhk.co/mofipife/cAjdJY3/how_to_draw_a_cartoon_girl_face_easy.pdfIn PDF document text
    • http://realwockyc.info/livolotaphxba.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://dosatetirudipu.epizy.com/jasirugudadupafalovotim.pdfIn PDF document text
    • http://lugimes.epizy.com/7950356169.pdfIn PDF document text
    • http://lememisuxelivem.rf.gd/jopofakekije.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_off0000eacd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEACD 5224 bytes
SHA-256: e2e7732a335dd366be51bc0f8c76c9a6e7560f79da213dcd80a6227ffad6c2d5
font_01_sfnt_off0000fcb4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCB4 11336 bytes
SHA-256: 6adef4742dfec539b5bded84b40da24ea2ee89e5524cfd6eb9aadc22b5905487

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