Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed0709b61725275e…

MALICIOUS

PDF

76.0 KB Created: 2021-04-02 00:52:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 567d7a3bf71ef269f8fdeb3f41838719 SHA-1: 78ada6d95af2cb220bf99bb20fcd1bea238ce6c4 SHA-256: ed0709b61725275ed2408fb49545d8a1458ed32aa8fa9ca2e8c61d444d152418
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://jacksth.ru/strik?utm_term=asp.net+mvc+5+autocomplete+textbox PDF link annotation
    • http://fullhp.info/jimmy_choo_full_hd_video_djpunjab0h2sf.pdfIn PDF document text
    • https://cdn.sqhk.co/tusufawenu/8hhJRuI/tafipatesot.pdfIn PDF document text
    • http://cleaner360.shop/business_information_technology_salary_in_kenyasziyk.pdfIn PDF document text
    • http://teaitalis.space/all_clad_sc01_replacement_partspcmvf.pdfIn PDF document text
    • http://koolmaxt.online/jabra_step_wireless_pairing_problemsrya2f.pdfIn PDF document text
    • http://repair-kvadrokopterov.ru/53165740657gfg5s.pdfIn PDF document text
    • http://kozlo.space/column_google_sheetsoo8gf.pdfIn PDF document text
    • http://ontrade.top/77166334320cjwcr.pdfIn PDF document text
    • http://stopnutristrike.ru/sapaferewafilozuxbawp.pdfIn PDF document text
    • https://cdn.sqhk.co/turanexode/jiaLfih/jolt_credit_union_hours.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/gudukupir/airplane_mode_games_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jivamubug/nizedorurizazuzodoj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/067a2936-9ef7-48c6-9cc5-6a1e02c99308/fuwizijarozexef.pdfIn PDF document text
    • https://s3.amazonaws.com/lorifumofelu/1963907363.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a3d9551-d11e-4f18-b321-b9a7ca1c00e8/dr_seuss_freebird_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/888c6f96-5f73-448b-a36d-835f322b5395/make_a_girl_group_name.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eceb2358-5f12-4506-80f3-67cea66016a0/how_to_use_garmin_marine_gps.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_off0000e67b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE67B 5396 bytes
SHA-256: 06b5a26aba5b46aae8018581012073cd7cde37d1de58eef0fa97455e095f9b39
font_01_sfnt_off0000f8da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF8DA 12244 bytes
SHA-256: 8edb5d998510c4cb06f32cbd5b86c70651183d25ed76d10a400a5687fb2065b3

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