Malicious PDF — malware analysis report

Static analysis result for SHA-256 7be4235c1ff5a5f2…

MALICIOUS

PDF

41.1 KB Created: 2020-11-08 12:47:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 59659e04ca4d890cbd6266f618731469 SHA-1: dc281b5f8caebf01788c9fbd2b6ca2b2451aa512 SHA-256: 7be4235c1ff5a5f2dd71622a3af51aa02afc26b83e520094546d5ac745abed9d
96 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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 1.0000

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://trafffi.ru/123?keyword=whitman+and+dickinson+poetry PDF link annotation
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/c931952c-ca2e-462d-8a94-aeba208d6fe1/historia_do_pensamento_economico_hun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ec125cd-8d84-40a8-b341-9dbedca3bea3/audible_deal_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7eefdab2-3d87-4977-beb6-e530ee4a2b46/jodowimovojovaxirogi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/873d4320-32ab-4611-8306-4c1486f86f50/cr2o7_oxidation_number.pdfIn PDF document text
    • https://nevosaxovib.files.wordpress.com/2020/11/infinitif_ou_participe_pass_cm1.pdfIn PDF document text
    • https://basulirezono.files.wordpress.com/2020/11/10580312246.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2377df9-8287-4097-a48f-14f4c202b2d2/klipsch_r-_625fa_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6430120e-b4ce-473c-9e04-45f4e2d742c5/schwinn_discover_womens_hybrid_bike_700c_wheels_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/eaa7692b-d8fb-45d9-a061-ea6f0a35bc54/wabekivuduj.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b545c4db-9ea0-4a21-91a6-6c0b31ab9d3c/benojagu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ad2d219-e913-4df8-9a4f-3e9ed04a2b0f/tiwoxidukoxavi.pdfIn PDF document text
    • https://mutozofe.files.wordpress.com/2020/11/67728004733.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_off00006074.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6074 5460 bytes
SHA-256: 6cd8f09d4ee69284205786bd584b3af88d349db64f75f2b50dcf453c3527dc3c
font_01_sfnt_off000072ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x72EC 11060 bytes
SHA-256: 036df7eb38407a9317605ef60029108d95b95ef645745d266e929686dff94d1e