Malicious PDF — malware analysis report

Static analysis result for SHA-256 a9e8eea2f61cba47…

MALICIOUS

PDF

95.1 KB Created: 2021-03-31 13:12:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 8714819d76058d9bf22b225ef14f1bb4 SHA-1: ec5298e048d7ea5dcdbeda2ebf2141f095b90e42 SHA-256: a9e8eea2f61cba4790c34c4469a7a200f50e1ad6c2d48883094a29f591e097f0
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://seumenha.ru/award?keyword=%25D0%25B8%25D1%2581%25D0%25BA%25D1%2583%25D1%2581%25D1%2581%25D1%2582%25D0%25B2%25D0%25BE+%25D0%25BB%25D1%258E%25D0%25B1%25D0%25B8%25D1%2582%25D1%258C+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4391624/normal_6003636ee032c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452850/normal_60419b8e30ef5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407664/normal_604f415e2f8fe.pdfIn PDF document text
    • http://fesabip.iblogger.org/gijizaleluvolakupokovuv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425237/normal_6042b6dc3090b.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4449618/normal_60005c4529e60.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375884/normal_5feb584b1a6dd.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/aed36c54-a971-4f55-b6a8-956a2446bbfc/79322431719.pdfIn PDF document text
    • http://fibubaxuvuvixik.epizy.com/buvugovemita.pdfIn PDF document text
    • http://vazozizid.epizy.com/que_es_un_editor_de_presentaciones_multimedia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a75252c-bbe1-451e-8707-26cf62a01d7d/bivisudo.pdfIn PDF document text
    • http://bawujirilo.epizy.com/kitchenaid_6-qt_575_watt_glass_bowl_lift_stand_mixer.pdfIn PDF document text
    • http://pevurevakube.rf.gd/hp_deskjet_2620_ink_cartridge_error.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3d0500ec-7639-41d5-8439-291911dbd2a6/84847559672.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df6cde53-b7d1-455b-85c0-38085bbf5d23/48039120329.pdfIn PDF document text
    • http://popewap.epizy.com/31463298444.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e46db12e-103a-415e-b705-394078470c94/24078350087.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_off00012771.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12771 5652 bytes
SHA-256: fd85a2e5e59d419bc04ce88f98f6ec1b0434c1ef8f843ccd0fe6f6af044a78e4
font_01_sfnt_off00013ab6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13AB6 16500 bytes
SHA-256: 33c4836b5f6a6cfc2228b47e1af34760f56cdfe3d4a6b2d1f6ab171afb77dde4

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