Malicious PDF — malware analysis report

Static analysis result for SHA-256 79c8537817eb7b0d…

MALICIOUS

PDF

83.1 KB Created: 2021-03-30 20:22:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7705df523e9457df18605d9d2319ff4d SHA-1: 3105360754b2c62028698577d39df1f8946f7417 SHA-256: 79c8537817eb7b0d017170eae13485d4ae64e26ee893266504fcd4f6eafafd74
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 0.9995

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=what+is+the+concept+of+curriculum+change PDF link annotation
    • http://ragofilud.medianewsonline.com/article_370_in_telugu.pdfIn PDF document text
    • http://bixekakazozerol.mywebcommunity.org/all_in_one_book_science_class_10.pdfIn PDF document text
    • http://tetizeniwa.mypressonline.com/mnemonica_free.pdfIn PDF document text
    • http://jufumabenosenup.iblogger.org/ritapivujetadov.pdfIn PDF document text
    • http://ruguwafe.scienceontheweb.net/budidaya_bunga_telang.pdfIn PDF document text
    • http://zufonedisogaj.iblogger.org/clothes_and_accessories_worksheets.pdfIn PDF document text
    • http://lolebunefa.iblogger.org/fibifil.pdfIn PDF document text
    • http://walawatomu.mywebcommunity.org/angular_interview_questions_and_answers_for_experienced.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/b8d5c123-88ae-4c6d-8986-fffcb6146b43/buzerikekuripasewezepivo.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/edc998a9-d280-4c89-b7f7-1eb52cbea288/xapaxedekotiwimogadawoxud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/07136145-8760-495f-a6a2-b47cdc36b390/05_honda_rancher_350_top_speed.pdfIn PDF document text
    • http://rinimodosejowuf.myartsonline.com/46752008844.pdfIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/kijuluvutunob.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/judith_butler_they_them_pronouns.pdfIn PDF document text
    • http://saxarivoje.onlinewebshop.net/ethnographic_approach.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ad1e134f-c7ec-4bd2-9142-e98465cffb1f/murarilukofuretaloveret.pdfIn PDF document text
    • http://bazimiguzanuv.rf.gd/17406815902.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bcee80ba-e538-40af-b7ca-9fa5f6635f79/kumojekenuwavekasoji.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8b2f72fc-f3eb-4fc2-986d-26c76d5763b9/how_to_reset_thermostat_on_hot_water_heater.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/93dc5a30-c67e-4953-8e13-b659e9ad48bd/logitech_k360_wireless_keyboard_usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/59a23a2e-307e-4bf9-9cd4-24620378ab68/tamil_novels_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4e2c25f0-6123-4f53-91e1-37c23c23f44c/les_miserables_violin_sheet_music_free.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_off000107e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E3 5444 bytes
SHA-256: a3678c376c626646d97ac41e6c4c3e06337c69d6df8de7740e7e3d0b60634d6e
font_01_sfnt_off00011a4a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11A4A 10628 bytes
SHA-256: 90fdc1ffb2e08532fb650fbb7908ac7bb69497fcd349a0fb17c21e695a291ea0

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