Malicious PDF — malware analysis report

Static analysis result for SHA-256 374bfb60fac1f525…

MALICIOUS

PDF

80.0 KB Created: 2021-03-23 11:33:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 1f0fa361e206c821ca59e2e8722131aa SHA-1: 10f02d8751bc4f8b1365256864d40cc20b47934e SHA-256: 374bfb60fac1f5254343b06b3a962c9e7aa10fedd02cf1df6beebc985c02ec21
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 0.9993

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://resalured.ru/strik?utm_term=why+do+students+don+go+to+school+on+staff+development+days PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4383300/normal_6057b2c21c891.pdfIn PDF document text
    • https://cdn.sqhk.co/luwosera/bkbheht/39532613396.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/hf5QVFX/barber_shop_appointment_app.pdfIn PDF document text
    • https://cdn.sqhk.co/jabisopomuxo/vhgiigg/darejitiwup.pdfIn PDF document text
    • http://shoop-fl.ru/dell_r740_server_datasheetwnd86.pdfIn PDF document text
    • http://saporik.scienceontheweb.net/wezekane.pdfIn PDF document text
    • https://cdn.sqhk.co/fovipobex/dUichgv/56873014570.pdfIn PDF document text
    • https://cdn.sqhk.co/kufezakit/idiijas/lined_paper_with_border_template.pdfIn PDF document text
    • http://lnstagramverifycentre.com/kojugakixobhhqu.pdfIn PDF document text
    • http://lisolu.org/15247150850zm4d3.pdfIn PDF document text
    • https://cdn.sqhk.co/giruzegovu/ahgSfDX/ballout_baby_i_been_ballin_lyrics.pdfIn PDF document text
    • https://cdn.sqhk.co/dikizumi/tggjfr7/39940815768.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/tkZejiD/pamotefilowu.pdfIn PDF document text
    • http://popularchoice.space/personality_traits_quizfaj3q.pdfIn PDF document text
    • https://cdn.sqhk.co/nobutowug/he0Rjjq/9071620019.pdfIn PDF document text
    • http://becloud.website/how_to_set_my_suunto_core_watchvbe5g.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368240/normal_6014c3bf00221.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwumixe/0MfwSih/17186693788.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415935/normal_5fd7a8dfa7226.pdfIn PDF document text
    • https://cdn.sqhk.co/dikapagoloza/4ieihsr/jagunumuvomuxusilejimusar.pdfIn PDF document text
    • https://cdn.sqhk.co/golemejexeno/gdShcji/luna_s_fate_top_up_codashop.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490127/normal_6003b53f37eeb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pebomotixot.myartsonline.com/how_to_reset_element_tv_remote.pdfIn PDF document text
    • http://suduxegowur.onlinewebshop.net/jefafibiwofojizafadaj.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_off0000f9cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9CC 5648 bytes
SHA-256: 360d3f01405527590f3af8916b4ec48b96947ca84a584654f8417dbaaddc4c6a
font_01_sfnt_off00010d08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D08 10724 bytes
SHA-256: 6132b434c180d088be9a629ed874c00546cf78d0c5713bdaeb05e79dbe8177b3

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