Malicious PDF — malware analysis report

Static analysis result for SHA-256 d2d90c21b05e69aa…

MALICIOUS

PDF

76.3 KB Created: 2021-03-13 15:07:06 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 25a8153386904087ab7bd91e80bcf554 SHA-1: b14bab0879b3559e265df2516427f2c68b2e2f27 SHA-256: d2d90c21b05e69aaf9e82fb7f17ac9b916b282d41e30f820f85a4c9f34ec7320
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains multiple external URIs, with a primary lure related to a "Kahoot survey multiple answers" and pointing to suspicious domains like seumenha.ru. The PDF structure and embedded links suggest it's designed to redirect users to potentially harmful content or facilitate further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://seumenha.ru/123?utm_term=kahoot+survey+multiple+answers PDF link annotation
    • https://cdn.sqhk.co/foletesubuf/9Cgjp4b/mini_speedy_dupe.pdfIn PDF document text
    • https://cdn.sqhk.co/wemitupu/jhTFaje/excursiones_cruceros_msc.pdfIn PDF document text
    • https://cdn.sqhk.co/jogepirar/wOjddib/zombie_hunter_sniper_apocalypse_shooting_games_apk_mod.pdfIn PDF document text
    • http://nakidki-alkantara.xyz/mononevinufubawexufigikedgsc9j.pdfIn PDF document text
    • http://afracheat6.xyz/164876740285ws6.pdfIn PDF document text
    • http://topvideo.design/20058060672n5wpi.pdfIn PDF document text
    • http://fly-drive.online/dd_5e_ships_cost3ppnw.pdfIn PDF document text
    • http://ttttrrrr.space/42317918470lbpva.pdfIn PDF document text
    • https://cdn.sqhk.co/pawiwodogu/95heUjf/sojibasibasawik.pdfIn PDF document text
    • https://cdn.sqhk.co/muvotugi/gdGjdSE/21603278811.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/rikolesafuwofar/dimudomowafo.pdfIn PDF document text
    • https://s3.amazonaws.com/pomaxa/allergic_urticaria_symptoms_merck_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/zisulamisozoto/84795651685.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb8e000e-4002-42d9-928d-3731510cf65e/16938884125.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70c6448a-6210-46a7-817a-f1a444070139/tcl_32_inch_roku_tv_1080p_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7d7d926d-72e2-49c6-bef0-a007028344d6/phonak_brio_3_hearing_aids_cost.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fd8f80ab-aa40-4896-959e-2f65d121d6a3/7405829322.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/bovedenekepekenuxuka.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/629bcafb-b17a-4281-a0af-8119603aee1c/what_are_all_the_negative_emotions.pdfIn PDF document text
    • https://s3.amazonaws.com/sepovutapakogaf/74278609430.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cc02c2e3-76f7-46f7-b9e6-7514ee8c1b3a/how_to_connect_a_microsoft_wireless_keyboard_3050.pdfIn PDF document text
    • https://s3.amazonaws.com/viboxikuz/ielts_exam_answer_sheet_writing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c732dcd-42e4-4156-8302-70cc381ea8e7/south_carolina_driver_license_validity.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_off0000e534.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE534 5284 bytes
SHA-256: f4e356b12f374630c004a61eb3b4a514b513143c9f01337fa44d4da1886c350c
font_01_sfnt_off0000f71c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF71C 12612 bytes
SHA-256: 97d2b41311653774c1ccd0439c0b9e1e1b87cd45a15b147d6862d14365ec0aa6

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