Malicious PDF — malware analysis report

Static analysis result for SHA-256 40abbfb09ae264d4…

MALICIOUS

PDF

70.8 KB Created: 2021-05-28 23:51:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 52d04e8a74f47b14b9b8a146b9798a8d SHA-1: 82f885d9f3bdb7af60782476c38a6ce906fb46fb SHA-256: 40abbfb09ae264d434cdf9bff3b51aa1c306c004e0a4c1ec36672123abf1deda
156 Risk Score

Malware Insights

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

The PDF file contains a heuristic firing for a link farm, indicating it is designed to redirect users to external websites. The embedded URL `https://crophysi.ru/wb?keyword=what%20is%20restrictions%20a%20on%20ga%20drivers%20license` suggests a phishing or SEO manipulation tactic. ClamAV detection as `Pdf.Phishing.Trojan` further supports a malicious classification. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a phishing attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

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://crophysi.ru/wb?keyword=what%20is%20restrictions%20a%20on%20ga%20drivers%20license
    • https://cdn-cms.f-static.net/uploads/4367940/normal_60421be0ea239.pdf
    • https://cdn-cms.f-static.net/uploads/4446507/normal_606839f06341e.pdf
    • https://tonavibete.weebly.com/uploads/1/3/4/7/134748981/bodudijid.pdf
    • https://ginegumogigoxi.weebly.com/uploads/1/3/2/8/132816185/3b385a21d.pdf
    • https://teretusux.weebly.com/uploads/1/3/4/6/134687242/f98a18959df0.pdf
    • https://dalatomim.weebly.com/uploads/1/3/4/3/134344090/5361568.pdf
    • https://vevavosabiwebe.weebly.com/uploads/1/3/4/3/134349804/4231744.pdf
    • https://viwuxujubefana.weebly.com/uploads/1/3/4/6/134625166/devaz_luzazej.pdf
    • https://rezizeme.weebly.com/uploads/1/3/0/7/130775554/wexeba.pdf
    • https://vilewojux.weebly.com/uploads/1/3/0/8/130874250/7841698.pdf
    • https://cdn-cms.f-static.net/uploads/4485445/normal_5fd960b057fd5.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/d81cc323-8f6f-4786-98e3-2c6218367f59/dinofinomumofop.pdf
    • https://uploads.strikinglycdn.com/files/1ca85fdf-a5fe-443e-a2b1-049fbeda56a5/hanuman_chalisa_in_kannada_download.pdf
    • https://uploads.strikinglycdn.com/files/e1e00f9e-013c-4f8d-b3d2-14c8fbdaa3a3/fatekibavekav.pdf
    • https://uploads.strikinglycdn.com/files/d2cc13e8-d928-4cca-a279-7479dc3519d6/how_to_adjust_the_spray_on_a_rainbird_5000_sprinkler_head.pdf
    • https://uploads.strikinglycdn.com/files/6d5a7d5f-5d06-4eaf-88c9-7c7ec1745189/85279294571.pdf
    • https://uploads.strikinglycdn.com/files/208033d2-17fb-48b5-ace8-470b13aacd68/why_is_my_rice_cooker_light_not_working.pdf
    • https://uploads.strikinglycdn.com/files/8fbcd409-6b7c-42e7-9594-12553ad43365/58257050032.pdf
    • https://uploads.strikinglycdn.com/files/3810eeb0-a6d9-4795-b659-7afba304e5ef/important_quotes_in_a_thousand_splendid_suns.pdf
    • https://uploads.strikinglycdn.com/files/e981b00c-906b-46cd-9bef-605f621da807/lunuwitarekodekaj.pdf
    • https://uploads.strikinglycdn.com/files/d8c2666c-bee0-45ff-ad0a-07018c2c50c1/45341684130.pdf
    • https://uploads.strikinglycdn.com/files/b91073ca-6719-485d-8150-15d406ecbcd2/project_management_professional_certificate_program.pdf
    • https://uploads.strikinglycdn.com/files/b3bb06c1-2037-44e0-b89b-8c5b1dcf8385/nasb_version_review.pdf
    • 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_off0000d749.bin
d5aa88dbe0139f16911c6250526990e996061a6819e8dd0520758efcf6290ffb		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD749 5272 bytes
font_01_sfnt_off0000e940.bin
514071a3b11b6082341d24d9d275045a7e0d0f5e0107b71fc7a4d79985010142		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE940 10788 bytes

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