Malicious PDF — malware analysis report

Static analysis result for SHA-256 7acde7024d9707bc…

MALICIOUS

PDF

89.7 KB Created: 2021-04-01 03:45:54 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 351cda208bc16770ed62ceef56da589b SHA-1: d9f958fdf05d4d227a1a18b64e7eca6fa42842f2 SHA-256: 7acde7024d9707bc3a28f36867a1643a80e94570b1f21d9fa3eaa2f9f1219fe7
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://jacksth.ru/wix?keyword=himno+nacional+del+ecuador+segunda+estrofa PDF link annotation
    • https://cdn.sqhk.co/tokofape/igXT0ka/nusufexafedepirizake.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367277/normal_601b1847e8fb7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483089/normal_603748950f9db.pdfIn PDF document text
    • https://cdn.sqhk.co/remimidotomi/jbjjhjs/84891041166.pdfIn PDF document text
    • https://cdn.sqhk.co/zimidenex/hfCQLid/piano_man_movie_gazal.pdfIn PDF document text
    • https://cdn.sqhk.co/gozawelesutu/jiNhdO2/woxififipukipedikiwo.pdfIn PDF document text
    • https://cdn.sqhk.co/wuladupuzo/bK0ibz4/petabomavokefomo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388407/normal_605b4f498335a.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366402/normal_5feb5ccd089c5.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/2cbf979d-ffac-476b-9b31-6b49d27d49c3/bekajeje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ff5f9e7-5be7-432e-9e31-91e63834b8a9/10749593208.pdfIn PDF document text
    • https://4de1274e-a26b-4e71-a0d1-d86f0cfee7ee.filesusr.com/ugd/ee4d88_447e0586e6674aeb9b720d6e998a8d25.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b269fdee-170d-4f5f-b7b1-37e77cf614ad/democratic_leadership_style_in_nursing_journals.pdfIn PDF document text
    • https://5613ab86-cfe5-4642-b9e1-29ab5e510d76.filesusr.com/ugd/79e000_24978e6cd7c44fbf953393fb0369867d.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6e4a7197-f4a5-43eb-a35a-b43b51e9ace6/sylvia_plath_daddy_analysis.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1e88c19a-65b0-48e2-bea4-daf9c5d7b574/14381311168.pdfIn PDF document text
    • https://7c8f45b7-e058-4e27-bccd-8ee7dcb26900.filesusr.com/ugd/d5cf39_b629dcd065d048b5b9793a0adce0458b.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9047bc8-3b3d-43ab-bbdd-b0d1e6b7ae90/nubitisoxife.pdfIn PDF document text
    • https://307a23dc-bb60-4906-9a68-69e45957aa19.filesusr.com/ugd/d2057d_a6b1e91981d145eaae7c536eb8580103.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/b6ff8f2c-b120-49e4-a086-5b037c385b80/48066287091.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_off00011d78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11D78 5300 bytes
SHA-256: 9dcb7959fc485b4502520ff5c9295fdcd542c450407dfab758c3cac5c30d1b21
font_01_sfnt_off00012f60.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12F60 12324 bytes
SHA-256: 90cfcfac99ef5d486d7033bfcff69e7e217c53a272f8e31f6c82a322295c6dba

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