Malicious PDF — malware analysis report

Static analysis result for SHA-256 6cde378e02070b2a…

MALICIOUS

PDF

119.1 KB Created: 2021-04-23 11:54:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b987ff0122bb116c0ce839b00bb349fd SHA-1: 76f32a7b9de67ba0904c1568d0519abc7bfc4605 SHA-256: 6cde378e02070b2a9617af5cf0e27aa46be31b92e92795344916c182424df7bb
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The primary URL points to a search result page for 'samsung smart tv 55 inch 4k curved', suggesting a lure for potential buyers. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent behind the link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://kuzutuzo.ru/strik?utm_term=samsung+smart+tv+55+inch+4k+curved
    • http://streamsweets.com/b__co_gi_2irvbi.pdf
    • https://cdn.sqhk.co/tojemapimibo/CI8ifih/infinity_looper_expression_pedal.pdf
    • http://wordsideget.top/carrom_board_java_game_128x160k6lz1.pdf
    • https://cdn.sqhk.co/lojulifuvuxu/ghBtxhg/kowufofaliwo.pdf
    • https://nimukebobe.weebly.com/uploads/1/3/4/5/134527887/vitebo.pdf
    • https://cdn.sqhk.co/fekesolip/iiiid3g/best_rock_song_piano_covers.pdf
    • https://fekobuwag.weebly.com/uploads/1/3/1/8/131858403/pipuvilu_mowilogaguxuga_riguxitomalar.pdf
    • https://cdn.sqhk.co/bijozugetav/J8hc9ii/offline_poker_for_windows_7.pdf
    • http://shoplus.info/divina_comedia_italiano_espaoldyw91.pdf
    • https://cdn.sqhk.co/xinulezebi/W0fkBvU/jidikaruwof.pdf
    • https://nixixufusolawig.weebly.com/uploads/1/3/4/8/134882604/sozet.pdf
    • https://jutineriru.weebly.com/uploads/1/3/4/8/134866815/af270246ee.pdf
    • https://cdn.sqhk.co/miviluwulux/9kCgdgd/15802763561.pdf
    • https://cdn.sqhk.co/bevurokakug/ekvWlhb/most_interesting_facts_about_asteroids.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/6bcc712b-47da-4a88-8697-77492f46b727/hitchhikers_guide_to_the_galaxy_radio_series_listen_online.pdf
    • https://uploads.strikinglycdn.com/files/e9d22266-a107-4962-8e50-0035d046e01c/kawofosef.pdf
    • https://uploads.strikinglycdn.com/files/fd580f38-7aea-463d-8d64-f97f4f672a14/15966212976.pdf
    • https://uploads.strikinglycdn.com/files/cc0e707c-366f-4d1f-9fa3-f0bb0502871f/taxazozubomedogufesalobe.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018f5f.bin
8eac4d89c201e71a66c3afd1af8f876df0c67474e3f8ed9b5938c40d8080f6a6
pdf-font-stream PDF embedded font (sfnt) at offset 0x18F5F 5760 bytes
font_01_sfnt_off0001a2e2.bin
37437448aaacb32cf754e22a5a6cb50fef5b5ffb0839b94f14c04ccb4f4899c1
pdf-font-stream PDF embedded font (sfnt) at offset 0x1A2E2 13072 bytes