Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae09b8a15431ac29…

MALICIOUS

PDF

75.6 KB Created: 2021-04-16 14:56:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: e7e974a98c5df002a4577891bcae0947 SHA-1: c58fbd843d0090b5955068b693efc7777138303a SHA-256: ae09b8a15431ac29d82afc1c004b0698ec1762cabcf0827dd4158941a3df4461
126 Risk Score

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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://druttle.ru/strik?utm_term=native+american+rock+art+symbols+meanings PDF link annotation
    • https://cdn.sqhk.co/fiseguvugele/aDkSKxr/39148129650.pdfIn PDF document text
    • http://pitushok.space/winejawuriwudibujatasairnxo.pdfIn PDF document text
    • http://subfamjtii.site/how_to_set_liftmaster_garage_codeu79th.pdfIn PDF document text
    • http://petojasunegoda.iblogger.org/ablaze_for_god_wesley_duewel.pdfIn PDF document text
    • https://cdn.sqhk.co/nizufalagef/cUlZhi3/meena_game_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/petawelesup/DfpUzjb/jomaxobemubaz.pdfIn PDF document text
    • https://cdn.sqhk.co/bovutolomevo/fjeggDj/international_business_master_degree_online.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/kofabube/10649492298.pdfIn PDF document text
    • https://5e0c4d4d-41f9-428c-9564-b93e7cff6769.filesusr.com/ugd/510691_bdb5a2666f58419f9ec141df83a59e97.pdf?index=trueIn PDF document text
    • http://papitanado.rf.gd/lubuperatuvagibaveluxoned.pdfIn PDF document text
    • https://s3.amazonaws.com/kagedatabujo/jozum.pdfIn PDF document text
    • https://s3.amazonaws.com/lijulijowivaze/6317088277.pdfIn PDF document text
    • https://29ca30ec-7ad4-487f-8637-d2d67f3a323c.filesusr.com/ugd/10b11f_a4ce8809b14d471ebe1f3e4a5f08f605.pdf?index=trueIn PDF document text
    • https://b54663a3-ff9d-4122-b75c-69b71428c9b0.filesusr.com/ugd/cfa91a_251dc977b5dd4021afd4cf0897055e7e.pdf?index=trueIn PDF document text
    • http://xajebanexored.epizy.com/7898161189.pdfIn PDF document text
    • https://2489a575-72f7-492f-b117-28cfe4a4d2a3.filesusr.com/ugd/d81705_39f7aa3c02bf42b6827fcb4ef84c605d.pdf?index=trueIn PDF document text
    • http://wotalajo.epizy.com/alameda_alliance_appeal_form.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_off0000eb1a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB1A 5452 bytes
SHA-256: c5aa11aa6e5f18540174e5c9ba9f0876f3aff1cb0ed0ae4403a50754ec594391
font_01_sfnt_off0000fdad.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDAD 10480 bytes
SHA-256: b490d784fd00e03bd0ae3b45b2038ccf368728b71cd3d63f1623dead163b28b4

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