Malicious PDF — malware analysis report

Static analysis result for SHA-256 b077e7c8e30229b7…

MALICIOUS

PDF

76.9 KB Created: 2021-04-05 17:02:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: f1d901c2682dcc9b69366f818023533a SHA-1: ea1ec011c73e103dcc387c952fe6c9d96317cd94 SHA-256: b077e7c8e30229b709060567128609b2891a9b85ce9a6e5ac1391d36fc20ba7a
96 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for PDF_SEO_LINK_FARM, indicating a large number of external links. One of these links, https://lozipotod.ru/strik?utm_term=how+effective+are+mini+splits, is flagged as an external URI. The ML classifier also strongly indicated maliciousness. The document body is heavily obfuscated, but the presence of numerous external links suggests a malicious intent to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://lozipotod.ru/strik?utm_term=how+effective+are+mini+splits PDF link annotation
    • http://salleapp.xyz/2242514959423oty.pdfIn PDF document text
    • http://vizit.store/2001_mazda_protege_repair_manual_fre0lh6l.pdfIn PDF document text
    • http://help-copyrighteamservice.com/wevotikixigudunetaresuzimgn6j.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/jbhijha/50624153293.pdfIn PDF document text
    • https://cdn.sqhk.co/nixibaraje/3pUDZjd/super_free_slot_games_100_free_spins.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/zedudo/38738311861.pdfIn PDF document text
    • https://s3.amazonaws.com/viregujipowuru/savowadopobokumegawi.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/29051862193.pdfIn PDF document text
    • https://d5cf7a15-73c9-49c9-ad57-d4f0303abb0c.filesusr.com/ugd/0d002d_00485f34de1749e5b657bc3b0e8dcd42.pdf?index=trueIn PDF document text
    • https://f0ddeb88-3549-4a27-8821-6e3dd713f165.filesusr.com/ugd/2b74da_76ad85651acb498fbdbf83acf16b56c6.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/magapeguwabe/motegeronoxodiwewupoboni.pdfIn PDF document text
    • https://s3.amazonaws.com/tapexiw/37268071448.pdfIn PDF document text
    • https://02664c88-84e5-42fa-aae3-682d3a0d4328.filesusr.com/ugd/39d081_ba6437a7c2ff40a6a7999fe674e21d15.pdf?index=trueIn PDF document text
    • https://c546c886-5aa5-41cc-813f-4ed3e146772c.filesusr.com/ugd/b3e52d_af9aff44d88b463d8dcaa8a85d69ee19.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rewepalazamiso/79239400878.pdfIn PDF document text
    • https://s3.amazonaws.com/dinigugaxej/6_piece_jigsaw_puzzle_template.pdfIn PDF document text
    • https://s3.amazonaws.com/kavifunaruvi/pearl_of_great_price_student_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xakapudakadu/69633135887.pdfIn PDF document text
    • https://s3.amazonaws.com/panalipolifod/chocolate_city_full_movie_free.pdfIn PDF document text
    • https://s3.amazonaws.com/zewimu/kenmore_coldspot_not_getting_cold_enough.pdfIn PDF document text
    • https://s3.amazonaws.com/xeroguru/38919943847.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_off0000efc9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFC9 5276 bytes
SHA-256: 50412697cfa33a7f49df11221015b9099794e57032c14fdbc5e022689e55b971
font_01_sfnt_off000101c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C0 10760 bytes
SHA-256: a4e07b2ad7331b0fa0d4d313b580ea4c0b10adfc96ab8ac239195094f6ffc1e2

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