Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca2b447ab7e988da…

MALICIOUS

PDF

98.1 KB Created: 2021-04-26 06:29:46 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 82c33ab424793baa3f0f7696e3275d82 SHA-1: 975f6e01bfb99bbf89c1199e45cf95b74d17bdbc SHA-256: ca2b447ab7e988da2453ab56fc4b202441fda5a2b9e886423a36fedb98e7ed64
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 0.9996

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://fokemale.ru/strik?utm_term=sugar+changed+the+world+part+5+developing+and+refining+ideas+unit+test PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4494893/normal_6053d896b0e73.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418385/normal_6044d2be245a7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408703/normal_603cb4395c9a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4495065/normal_5fe5faa399eb4.pdfIn PDF document text
    • http://vemasujananexu.22web.org/facebook_frame_design_template.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://kobuxotaregudes.rf.gd/naruto_shippuden_psp_iso_game.pdfIn PDF document text
    • http://baxojusijopigas.rf.gd/60980959348.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/484e327a-c366-44f6-9a92-7a125c9ab72c/yamaha_djx-iib_for_sale.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/13e0bdf2-ac82-435e-b5e4-982cf319effd/what_is_the_hieroglyphic_writing_made_of.pdfIn PDF document text
    • http://jivafikoru.rf.gd/52303797208.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/49c669fb-1d35-41ba-a2a8-d82013cf8a15/7870103056.pdfIn PDF document text
    • http://wamivofubamaxit.epizy.com/sixeledulisasinukixonifug.pdfIn PDF document text
    • http://wivikisirijuleg.epizy.com/povevowoniwazez.pdfIn PDF document text
    • http://veguxakafopuvix.epizy.com/wings_of_fire_book_review_in_hindi.pdfIn PDF document text
    • http://godutugogusapa.rf.gd/90453249306.pdfIn PDF document text
    • http://tenefotozefuzuw.rf.gd/the_passion_of_saints_perpetua_and_felicity.pdfIn PDF document text
    • http://tosivasode.epizy.com/adverse_event_reporting_system_europe.pdfIn PDF document text
    • http://vosowetawevu.epizy.com/what_fast_food_places_have_gluten_free_buns.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ceb16342-41f0-43a1-af6f-11a553013ca4/6_times_tables_worksheets.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7a462591-2d50-4b1e-9b82-6d4fe37e9a64/how_to_do_a_daily_10_steps.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_off00014248.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14248 5796 bytes
SHA-256: 6c7a6aba6553928ecfd86cb7add4b22582d7c1f2f7d9754eb2122e15e869e489
font_01_sfnt_off00015620.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15620 10352 bytes
SHA-256: b973d66fb6fb49a81c65c260f5319194580028534561915973c55026a0797fef

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