Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdf769ad9e4121ce…

MALICIOUS

PDF

76.1 KB Created: 2021-03-30 16:54:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f355ac3acc4e2363651ea4b72cd25f3d SHA-1: 710b8c1b4258784604d8fc3ce0b00085d018534c SHA-256: bdf769ad9e4121cecaa0b17904c2d20be4cb9f93da826a39d705852ca567a260
126 Risk Score

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 0.9991

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://pelibifir.ru/123?utm_term=root+canal+treatment+video PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4427300/normal_605bbe224c2e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xuzuvazol/hbLmjgM/64691266101.pdfIn PDF document text
    • http://1xbets-regs.site/74431851490s5esp.pdfIn PDF document text
    • https://rupimobo.weebly.com/uploads/1/3/4/8/134891389/5956903.pdfIn PDF document text
    • https://juwizezajofop.weebly.com/uploads/1/3/1/6/131637218/sovuf_jawagopowisur_samufutiv_topabavisi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4479451/normal_5fe53a5266be5.pdfIn PDF document text
    • https://cdn.sqhk.co/tobamozusaj/ihlvaha/music_player_pro_apk_download.pdfIn PDF document text
    • http://onkoprofi.ru/us_army_officer_pay_scale_2012sv4b2.pdfIn PDF document text
    • https://tugalebuwe.weebly.com/uploads/1/3/4/0/134012885/gepiriwuleb.pdfIn PDF document text
    • http://mastera-saydinga.ru/volume_and_surface_area_of_cylinder_worksheet_tesnqvll.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500895/normal_5fd7e631577d8.pdfIn PDF document text
    • https://jeluxipofike.weebly.com/uploads/1/3/4/4/134490416/758cf38c9ac.pdfIn PDF document text
    • https://lufisadoxusixa.weebly.com/uploads/1/3/4/5/134583632/5187615.pdfIn PDF document text
    • http://makamar.xyz/guns_of_glory_game_guidevxee7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4485689/normal_6036999b77e4d.pdfIn PDF document text
    • https://ruvawuwejijexut.weebly.com/uploads/1/3/0/8/130814193/2533897.pdfIn PDF document text
    • https://cdn.sqhk.co/kewawukufiju/ifVGham/70259280233.pdfIn PDF document text
    • https://cdn.sqhk.co/kokojisip/cgjKggi/81646505413.pdfIn PDF document text
    • https://molulodanewiv.weebly.com/uploads/1/3/1/6/131606256/5498177.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/12aa5192-5e92-408e-b233-b376a81466dd/sd_835_vs_820.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6f56203b-48b3-444b-b7b3-e58c6bdfa726/colleges_that_offer_mechanical_engineering_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c34ba605-4183-4944-9d22-025b80d45a59/us_army_colonel_retirement_pay.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1debd3a3-acd0-4d8a-ba38-a25f0035ae07/wordly_wise_3000_book_10_lesson_2_answer_key.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e26f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE26F 4760 bytes
SHA-256: 4beb08ce40d83eb1e041f93dedc1f66f2179a4e9bc6ef054892096cbdd56779b
font_01_sfnt_off0000f282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF282 10044 bytes
SHA-256: 70b614fa98d79ef4cd83bd707437d42760885a253cb336992b1cd24f17d81f3b
font_02_sfnt_off000114f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114F1 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3