Malicious PDF — malware analysis report

Static analysis result for SHA-256 18723fae699b554d…

MALICIOUS

PDF

74.7 KB Created: 2021-03-31 05:59:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 396850d7079aa83d6e22932ab90a87f7 SHA-1: 59f2f5703c580106c622e88cc44ca10265c3a7c3 SHA-256: 18723fae699b554d3fa7a250171e5127f7f60b865c2e80458d29566ff7bf4aa0
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URIs, with the primary one pointing to a suspicious domain, suggesting it functions as a lure to a phishing or malware distribution site. The PDF structure and embedded links align with common phishing tactics.

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://xezojetit.ru/123?utm_term=mathematics+for+economic+analysis+hammond+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4410462/normal_6001e5d7421a5.pdfIn PDF document text
    • http://idealica-official-it.website/jopupixeforomx3b6f.pdfIn PDF document text
    • http://kkkirrreeee.space/ejemplos_de_textos_expositivosnts74.pdfIn PDF document text
    • http://ujjjrrrrr.space/19277441547t9iwk.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393898/normal_60327c3324505.pdfIn PDF document text
    • https://tezifotunojoke.weebly.com/uploads/1/3/0/7/130776805/nizelopexakotubo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425924/normal_60295a931a2db.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371495/normal_5ffddb1738a25.pdfIn PDF document text
    • http://foxiduwanati.mygamesonline.org/61547547114.pdfIn PDF document text
    • http://load-bcp.com/podakoduxakoruvqs29x.pdfIn PDF document text
    • http://robolab.one/unidad_informante_definicioncn9z6.pdfIn PDF document text
    • http://normal-id.com/32593067648viysh.pdfIn PDF document text
    • https://lurufakezudaka.weebly.com/uploads/1/3/4/8/134884294/xazeniresaxosubupe.pdfIn PDF document text
    • http://fitness1.space/vaibhava_lakshmi_pooja_book_in_telugugiklu.pdfIn PDF document text
    • http://wownatural.fun/664717918632l77m.pdfIn PDF document text
    • http://ruzamaji.getenjoyment.net/vocabulary_list_high_school.pdfIn PDF document text
    • http://melidagerukebel.sportsontheweb.net/63036527235.pdfIn PDF document text
    • http://sopisafexuj.sportsontheweb.net/convert_scanned_to_word_doc_free.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gubawakelu.onlinewebshop.net/64642638502.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4545ca1b-d2c9-4d78-b647-3f2a772920ca/14279379145.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e984d7dc-7e2e-4abe-8058-f23a29d5043d/new_garmin_945_release_date.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_off0000e495.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE495 5500 bytes
SHA-256: 9ff01a4386c42fd05fb57cc5585442a9ddf2e291f466933edba9242d4ada8c76
font_01_sfnt_off0000f739.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF739 11456 bytes
SHA-256: 96e46591b000a828b9121bb81205433ce71e7566d7444530fb7e7a8d1c33c72c

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