Malicious PDF — malware analysis report

Static analysis result for SHA-256 b535077da4da0653…

MALICIOUS

PDF

78.3 KB Created: 2021-03-02 07:38:14 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 667b466440c7401f2acd6ebedb5b4c64 SHA-1: 1c81adff334737df6d259b5f078bde6e6934be1b SHA-256: b535077da4da06532c836a75692ee64e756668ac2a454e22eef628448b7bbfd6
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 0.9998

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://golowaki.ru/wix?keyword=disc+golf+handicap PDF link annotation
    • http://beviluxenumiliv.mywebcommunity.org/weber_barbecue_recipes_chicken.pdfIn PDF document text
    • http://metoxegid.mygamesonline.org/brother_hl2170w_setup.pdfIn PDF document text
    • http://ketoxitigojaluk.sportsontheweb.net/whats_in_the_sky_tonight.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368759/normal_600acda46f081.pdfIn PDF document text
    • http://sunufosabupes.scienceontheweb.net/how_to_take_permit_test_online_in_new_york.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453337/normal_601dbcb91ae2b.pdfIn PDF document text
    • http://navevukosuso.mypressonline.com/xajasipemibololupubureliv.pdfIn PDF document text
    • http://xitabijasava.getenjoyment.net/how_to_use_telescope_for_beginners.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4417226/normal_603b2220ddfd7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485163/normal_601bc13d8022c.pdfIn PDF document text
    • http://desajegurake.scienceontheweb.net/63700281227.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4491946/normal_5fece6a8eca2d.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzujugasije/aihRgd1/speedway_masters_2_apk_android_oyun_club.pdfIn PDF document text
    • http://jiwapadenejeza.getenjoyment.net/clash_of_kings_strategy_game_guide.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374211/normal_600cbbd88d105.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/vixuwogetiv/foggy_mountain_breakdown_fiddle_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/sefukirexuwekij/html_css_pricing_table_templates.pdfIn PDF document text
    • https://s3.amazonaws.com/pevuwarobuvowa/tetris_n_blox_free.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/58184906188.pdfIn PDF document text
    • https://s3.amazonaws.com/zedudo/xosegiwebojemosobeluvad.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_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 5320 bytes
SHA-256: 30e19de46c3f76f6af77b0dfeddb0cf22c2452942035fdb49d33cbf773cabdd7
font_01_sfnt_off000107d3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107D3 10572 bytes
SHA-256: 7f2877936056555cfd55d20c4007782c2fedea1d91ff735a21143ed08e6dd577

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