Malicious PDF — malware analysis report

Static analysis result for SHA-256 87286fe6c18c3e47…

MALICIOUS

PDF

78.5 KB Created: 2021-04-04 20:21:42 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: fcdf1da9683bb77054bfb4ebd5fa25e4 SHA-1: 45f930adf67fadb1bd4278182f7a1ef564b557e1 SHA-256: 87286fe6c18c3e47012b1c9c226375b2640253ee48fab2894cbeeb11b95e65dd
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://golowaki.ru/wix?keyword=spotify+apk+tablet+version PDF link annotation
    • https://lubawefajisewo.weebly.com/uploads/1/3/4/4/134443910/5a9a4a9faf2b40.pdfIn PDF document text
    • http://avit0.cc/how_much_is_steve_jobs_net_worth35fip.pdfIn PDF document text
    • https://bezijenogekise.weebly.com/uploads/1/3/4/8/134875893/b2bdeb.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/xenim.pdfIn PDF document text
    • https://vezutokabev.weebly.com/uploads/1/3/4/7/134758566/1249939.pdfIn PDF document text
    • http://drnextact.xyz/field_hockey_training_videos_youtube0neyp.pdfIn PDF document text
    • https://cdn.sqhk.co/sizafutito/a9ehjWN/uber_driver_application_process_uk.pdfIn PDF document text
    • https://sakiverore.weebly.com/uploads/1/3/6/0/136095660/kuwevubada.pdfIn PDF document text
    • https://cdn.sqhk.co/javajadoj/1oB1idq/best_shooter_games_ps4_2018.pdfIn PDF document text
    • https://cdn.sqhk.co/risejesob/fieUggF/12316787524.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/tarajix/sukid.pdfIn PDF document text
    • https://s3.amazonaws.com/vazisi/wexunan.pdfIn PDF document text
    • https://88966db1-4a83-4446-b941-f65022a6235f.filesusr.com/ugd/928e0f_f6439438cc39440e99e1b93c75f9b800.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/godoremitiwuja/microsoft_games_spider_solitaire_windows_7.pdfIn PDF document text
    • https://s3.amazonaws.com/vikukinumet/56367005089.pdfIn PDF document text
    • https://s3.amazonaws.com/dazinibonofobi/how_to_lighten_your_bedroom.pdfIn PDF document text
    • https://s3.amazonaws.com/sikuva/the_creature_from_jekyll_island_book_by_g._edward_griffin.pdfIn PDF document text
    • https://cb0508fd-2a1f-4901-a161-a76823ee8e4f.filesusr.com/ugd/52013e_2f782050956b41949ecb4d9b7e5eca56.pdf?index=trueIn PDF document text
    • https://5bf49506-6ef1-42f8-8f90-7e3689255fd3.filesusr.com/ugd/8fe1bf_68e37e49a2d44df7b6dddb0d224e8369.pdf?index=trueIn PDF document text
    • https://044e8d80-c429-4a1f-820d-9b443c65b389.filesusr.com/ugd/53c654_c710ae60af1e42d8b27ad15efdb01d2c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sitok/66165864840.pdfIn PDF document text
    • https://d6477b75-8e4d-4453-8bbc-a86a6009e57c.filesusr.com/ugd/261d41_067e2fb6d9e542ffa00c0bc1b84187c4.pdf?index=trueIn 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_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 5364 bytes
SHA-256: 5296f928375886a3e405da72fd53462c41c275ecd434a2e03cc2df7c986056a5
font_01_sfnt_off0001049b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1049B 11308 bytes
SHA-256: cbca589c6e1d6c8fbb98b2bfeeb2573c945866505b97a126c412ce96e5a4dbbc

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