Malicious PDF — malware analysis report

Static analysis result for SHA-256 fbaf7df996bbe2d2…

MALICIOUS

PDF

74.1 KB Created: 2021-06-05 10:32:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 877e2faa3bdcbdbd43990f8e31dbbbd7 SHA-1: ed82e1c5da9cb6d2d065529ea7570cd619019bdb SHA-256: fbaf7df996bbe2d2d6519cbb0f38aff323fff9ff0cd4a4543282ef74633a8399
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://huntic.ru/pbw?utm_term=how+to+convert+ppt+to+pdf+with+embedded+links PDF link annotation
    • https://static.s123-cdn-static-d.com/uploads/4390074/normal_60b5829346dd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446019/normal_604cdf262a85d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481286/normal_602ce0e48212c.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383327/normal_60029b2dd2b1c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374024/normal_601806c31ae4a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378390/normal_602d6730b04c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470038/normal_600a4d1aab143.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/d7433aab-2518-4fee-8c47-489cf42a42f7/44444043695.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1d8c2f10-0758-4a07-a693-47633bc01ad2/kerbal_space_program_xbox_one_update_2020.pdfIn PDF document text
    • http://jadubunid.pbworks.com/w/file/fetch/144636549/the_boarded_window_by_ambrose_bierce_summary.pdfIn PDF document text
    • http://gitixofipoxu.pbworks.com/w/file/fetch/144538095/56464664737.pdfIn PDF document text
    • http://finebov.pbworks.com/f/54181416571.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6298aac3-f7a1-48c2-8ce4-1bc2241e27bd/gobejiro.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22569fa9-239e-486b-98dd-ba0ef4b0ec48/piridanosofikubaref.pdfIn PDF document text
    • http://jabodawo.pbworks.com/w/file/fetch/144608820/free_christmas_string_art_templates.pdfIn PDF document text
    • http://pitavumiza.pbworks.com/f/kopozezamekunut.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d6e93197-55b4-43bc-bf96-393c57c078d5/64835389230.pdfIn PDF document text
    • http://jolowajuwijo.pbworks.com/w/file/fetch/144589602/reading_and_writing_grade_11_module_answer_key.pdfIn PDF document text
    • http://rujuboxu.pbworks.com/f/sram_red_etap_owners_manual.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_off0000e522.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE522 5500 bytes
SHA-256: 96bd54a887a0351d62e16d0926610919152a822e021fed214db16042ace541b7
font_01_sfnt_off0000f7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7C0 10260 bytes
SHA-256: c0ab9f6fc4f92e17fe33f87d9a86319de8b8ff48ac00ac361f9abd72da9978cd

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