Malicious PDF — malware analysis report

Static analysis result for SHA-256 181ed18445d3d867…

MALICIOUS

PDF

81.6 KB Created: 2021-05-22 06:18:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 6fd8b35f7839e17635a3ba60e5b27461 SHA-1: 908bd5e927c22425e1d812034ed5e02132d04473 SHA-256: 181ed18445d3d8671bacad26ae7e1bb69dde5f05c66529454f0f4e1f1467cc45
96 Risk Score

Malware Insights

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

The PDF contains a large number of external links, with one prominent link pointing to 'fokemale.ru'. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or SEO poisoning tactic. The ML classifier also flagged this PDF as malicious with high confidence. While no scripts were directly extracted, the presence of numerous external links and the ML detection strongly suggest a malicious intent, likely to redirect users to a malicious site for phishing or further payload delivery.

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://fokemale.ru/strik?utm_term=mksap+18+cardiology+pdf PDF link annotation
    • https://viwosexoteb.weebly.com/uploads/1/3/4/6/134631328/84868cc806c.pdfIn PDF document text
    • https://valowitezud.weebly.com/uploads/1/3/5/9/135993777/wopefus.pdfIn PDF document text
    • https://lozezuxugi.weebly.com/uploads/1/3/4/0/134016676/968365.pdfIn PDF document text
    • https://mivuwapirodi.weebly.com/uploads/1/3/2/6/132681474/bavepodezovimimox.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/zebarufuridorur/basukotibovalefavo.pdfIn PDF document text
    • https://s3.amazonaws.com/mefonevimimix/billie_eilish_my_boy_piano_sheet_music.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c96230f-17e6-4641-9771-bcc6027d3c02/bufeke.pdfIn PDF document text
    • https://s3.amazonaws.com/remufuzu/39412745107.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2de52645-2ea3-43df-90cd-949674aff7b9/63510759044.pdfIn PDF document text
    • https://s3.amazonaws.com/vososasoxumete/apology_letter_format_to_hotel_guest.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ac9b8d9f-e515-41f6-bf31-7cdb2fb6fc6a/torasixudadufomifojedi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0520e84a-9552-4bcb-82d4-24163b05f764/3993661044.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d0fff73a-fef6-4f22-a27f-46689acb2465/spectrum_remote_guide_not_working.pdfIn PDF document text
    • https://s3.amazonaws.com/bulalowisu/betixuj.pdfIn PDF document text
    • https://s3.amazonaws.com/nefomojuwet/hp_network_automation_api_reference_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nitajosasa/online_adobe_photoshop_free_7._0.pdfIn PDF document text
    • https://s3.amazonaws.com/miledu/gba_emulator_android_full_version_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/kawotexulozax/37156256242.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/buss_it_down_phora.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d02d2a08-02a2-4c90-abf3-b021208f09e0/how_to_change_a_crosley_needle.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_off0000ff95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF95 5740 bytes
SHA-256: bc810735a96f561f05c0ef74c349981dc45350ae0e6eaa797e82b777788f2ccc
font_01_sfnt_off00011355.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11355 11200 bytes
SHA-256: 836e45c3b39fcff0ee713661f423e6191aebdeb6e2f3870f7c4b96af8a18ba1e

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