Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf6b8160f140f29…

MALICIOUS

PDF

88.1 KB Created: 2021-05-02 21:46:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 790b467b97c9e73ad2cef72cdd501901 SHA-1: 76c6fe230ba31d62e75fae2ee5b911d9eed740ef SHA-256: dbf6b8160f140f29c4a386270bb0b8719e3371dddab809ead78284e1e726c2cd
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, with one prominent link pointing to 'maypoin.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or redirection mechanism. The ML classifier also flagged this PDF as malicious with high confidence. No scripts were extracted, but the presence of embedded URLs and the link farm heuristic strongly suggest a phishing or redirection attempt to a malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9989

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://maypoin.ru/strik?utm_term=constitution+of+nepal+2072+in+nepali+date PDF link annotation
    • http://banademebilite.sportsontheweb.net/sed_awk_grep_tutorial.pdfIn PDF document text
    • http://bred-enligne.com/50422712088x1w9i.pdfIn PDF document text
    • http://kemutedetabu.scienceontheweb.net/anesthesia_free_download.pdfIn PDF document text
    • http://dakisemakegag.sportsontheweb.net/how_much_is_a_new_motor_for_a_2010_chevy_equinox.pdfIn PDF document text
    • http://jurojegame.getenjoyment.net/blockchain_for_dummies_filetype.pdfIn PDF document text
    • http://sowakowakemim.mygamesonline.org/zunidobotigepulino.pdfIn PDF document text
    • http://arnautmebel.ru/lather_and_nothing_else_packet_answersemtzu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fedorahosted.org/lohitIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c63efd6-8cec-4a62-afc5-80c80f77720a/73630339114.pdfIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_800c6c60a52c4be6b5e13585cf1a480a.pdf?index=trueIn PDF document text
    • https://d427386d-3434-45d9-8802-370857a594f4.filesusr.com/ugd/accd1f_d6d1c0cd4ffb4aafa3aab53fc018b5e7.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/tajimipojimo/pride_victory_10_scooter_service_manual.pdfIn PDF document text
    • https://47e244ab-6b1f-4ae7-97e8-86de5b619f9f.filesusr.com/ugd/e1d12c_fbe0b91428b642679f4979b71e382899.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0b89d78-814e-470e-a78d-6e7ffca01d00/91159471507.pdfIn PDF document text
    • https://ff999131-262c-4f46-aa1e-84c50d3d9e43.filesusr.com/ugd/a474dd_94e6f6bf8f9e468e9660b3e57836af34.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/86d763d5-f61a-4cea-847c-5a9d3b1a93d4/how_to_use_voldyne_5000_incentive_spirometer.pdfIn PDF document text
    • https://s3.amazonaws.com/zonebon/buvanofoderanudipupik.pdfIn PDF document text
    • https://s3.amazonaws.com/woxojuxafopuv/what_is_the_best_battery_lawn_mower_to_buy.pdfIn PDF document text
    • https://s3.amazonaws.com/bidurudilidujug/pofuzanipemozab.pdfIn PDF document text
    • https://s3.amazonaws.com/xupizewuxere/present_continuous_tense_worksheet_for_grade_7.pdfIn PDF document text
    • https://s3.amazonaws.com/wutisigila/nowifudibu.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/angularjs_2_basics_for_beginners.pdfIn PDF document text
    • https://6e3eaeb2-b9dd-4462-8b56-96c59beebd9a.filesusr.com/ugd/dcc11b_7da9160a6a3849a28ade162d3e001bf5.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/dokupativi.pdfIn PDF document text
    • https://s3.amazonaws.com/bovenotojitowe/el_nombre_de_la_rosa_personajes_principales.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_off00010ac9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AC9 5200 bytes
SHA-256: 46c13651eb4c23acba779518927449886013d004221478e264eca630b3bba6e4
font_01_sfnt_off00011c91.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C91 10664 bytes
SHA-256: 347a00e6b7ffa872bf607820af4e3aad9e9480e612adff034f48bb6446205c52
font_02_sfnt_off0001416b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1416B 3936 bytes
SHA-256: 24bd88e7e44a274061b517cd6a141bde792f1a6627aefd038813a411a4328de5