Malicious PDF — malware analysis report

Static analysis result for SHA-256 90b066d15d9c4c04…

MALICIOUS

PDF

70.2 KB Created: 2021-04-02 04:19:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 93431fb1c7a202c4f8f81f14fed9eb97 SHA-1: 205df2b159926eb0470fb1533778618185794e05 SHA-256: 90b066d15d9c4c048cc2d3b0dfcfa1b182048fe0fbd56372d9799873255175c8
156 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, identified as a link farm, with one suspicious URL pointing to 'botokaw.ru'. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/aws?utm_term=the+ancient+magus+bride+episode+7+eng+sub
    • http://theraisins.pro/neato_botvac_connected_dc02_updatelv7ck.pdf
    • http://genusadnlo.space/59913176244063dy.pdf
    • http://thrivewebs.com/hyderabad_weather_report_telanganawx8j0.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/ce665c7d-381d-4fab-a15d-d9a04d985193/fender_rumble_100_manual.pdf
    • http://bonizeza.epizy.com/which_garmin_watch_best_for_running.pdf
    • https://uploads.strikinglycdn.com/files/964629c3-6d0b-41ad-846f-b6cf750f1299/maximum_ride_james_patterson_book_in_order.pdf
    • https://uploads.strikinglycdn.com/files/227b1b38-be9d-44c2-b48b-548f65a43973/best_books_on_price_action_trading.pdf
    • http://wujawejibizub.epizy.com/zenalufalewajupas.pdf
    • https://a35aa970-3e4e-4c20-be1f-53d10001bce9.filesusr.com/ugd/af4e73_357ae68030884fff816f021795a8b275.pdf?index=true
    • https://uploads.strikinglycdn.com/files/976713f0-c731-45a7-8047-1d6305038c9b/tommy_igoe_groove_essentials_download.pdf
    • https://uploads.strikinglycdn.com/files/8e95cfb1-791f-43e2-881b-967906c2dd55/how_to_reset_nec_dt700_phone.pdf
    • http://tarexokugizizo.epizy.com/kivodi.pdf
    • https://64f1e6a9-4530-4009-9f9b-67b91dd69f79.filesusr.com/ugd/76b6de_ed06e2a4325e4d66bc753b1da42f03d6.pdf?index=true
    • https://uploads.strikinglycdn.com/files/a7309a02-bfcc-442a-91ea-10823296de65/how_to_start_daycare_business_in_ontario.pdf
    • https://b2fc43c4-60ab-4dc1-a1c8-84833fda4e2a.filesusr.com/ugd/37321e_713fd95800294ccf86aaab7c2f7802b0.pdf?index=true
    • https://a7da3e60-63c8-46c1-a846-eab7df628ed2.filesusr.com/ugd/bba345_a22769ba667447d19075a4c4132d2bd0.pdf?index=true
    • https://e6676b24-921d-4f57-8fca-beda98688f3c.filesusr.com/ugd/144d27_ccecd21857a84cd88db84ca93f6c2682.pdf?index=true
    • https://20e8ec16-a7ca-487e-906f-4b2d5c2744e2.filesusr.com/ugd/ab81b8_f670dcad9a13451aac142859030b878a.pdf?index=true
    • https://85d2c5a2-fc31-4f76-86b4-4ebe2abe2bf4.filesusr.com/ugd/a8cc01_81800d252de44db6a27c5c30385a5b6a.pdf?index=true
    • https://86a6be6f-1c3f-48a2-98e5-8a654ddc1212.filesusr.com/ugd/027f51_0be15b7dcc154903be7fb96bd072dae5.pdf?index=true
    • 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_off0000d48c.bin
be26d45211993a264bf222452cfbcdbdbe8a7b6220fccaaf3b34d29b3d8dc636		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD48C 5624 bytes
font_01_sfnt_off0000e77b.bin
14d14791e05c161d454b4080f1a3ad79702a2eefc903b7366983162a4dfc5ae2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE77B 10688 bytes

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