Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c31c48fbae1fad2…

MALICIOUS

PDF

93.6 KB Created: 2021-03-23 19:19:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: b196cf5b9fb8b43854eac1c9f44c054b SHA-1: c42a9390d6349ebe0c88d66746902065c0a3b758 SHA-256: 0c31c48fbae1fad27cffc5bcb61cd19b054e92de545f10d3817fe22aefcc85da
76 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF document contains a lure related to educational material ('similar triangles worksheet grade 8') to entice users. It embeds a URL that acts as an SEO redirector, ultimately leading to the malicious domain 'soxebez.ru'. The ML classifier strongly indicates maliciousness, and the overall pattern suggests a phishing attempt designed to lead users to a compromised site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

Heuristics 4

  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://soxebez.ru/wix?keyword=similar+triangles+worksheet+grade+8 PDF link annotation
    • https://cdn.sqhk.co/bapinero/WiaMRie/tatokulapinesikiwokowegi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380531/normal_6050680658f6f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4404984/normal_6006b4432887e.pdfIn PDF document text
    • https://cdn.sqhk.co/dedizajo/aib0eha/42250013433.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393188/normal_5fcda4dfbf9a2.pdfIn PDF document text
    • https://cdn.sqhk.co/pedidagow/bgfUJWb/73825835706.pdfIn PDF document text
    • https://cdn.sqhk.co/xavexapoxiv/SrLTgeK/world_record_tiger_shark_south_carolina.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4475997/normal_603a221b0f497.pdfIn PDF document text
    • https://cdn.sqhk.co/matijamaj/jbgihjr/88394280897.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fdfb83fa6e54.pdfIn PDF document text
    • https://cdn.sqhk.co/teketerep/gGij8xb/worms_snake_zone_io_battle_problem.pdfIn PDF document text
    • https://cdn.sqhk.co/lekibapufe/bibdgiH/shipwreck_grill_yelp.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472788/normal_60198751bad58.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426941/normal_5ff0a12037fa3.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/21f31759-c022-41c5-91ff-43d9f66742fa/how_to_replace_battery_taylor_thermometer.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b278ca0b-a9b5-430c-8df3-f02cfb920ddb/jededakaruf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8ecb1e89-1e21-4401-9a04-ec62ff833fce/traxxas_tq_2.4_ghz_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/tv_azteca_deportes_app_android.pdfIn PDF document text
    • https://s3.amazonaws.com/jimugivos/how_to_program_directv_remote_rc71_to_genie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0030eb83-1ae2-43ad-8410-43469a38ca1e/nevajozavedowuligipobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5f55ac7f-f751-4e73-bb36-7b85b35e8b87/what_is_the_roles_of_a_static_security_guard.pdfIn PDF document text
    • https://s3.amazonaws.com/rirusozo/why_do_companies_charge_a_restocking_fee.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0001152c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152C 5692 bytes
SHA-256: 4439c072c67a335cc133a8f18b4b333587a056c01c2789a65b03b55df9bcafcb
font_01_sfnt_off00012867.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12867 12092 bytes
SHA-256: da4c20c0d9047135e8eea5741b6386b92d20d786d258e2ee46081dd220d6057f
font_02_sfnt_off000151ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x151BA 16128 bytes
SHA-256: 55ad9a174a7376f081190d93ba8291613c533dbad088980f0ef3f5625dbeb66d