Malicious PDF — malware analysis report

Static analysis result for SHA-256 05e678dc4d3c491a…

MALICIOUS

PDF

76.8 KB Created: 2021-01-30 18:03:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a57ff52e258109b6165fe846d6817798 SHA-1: ebb980c2ffc66df78c260f4423406d9b50019a8b SHA-256: 05e678dc4d3c491ac528636c9429e757689c939424964a372cb567f0fc5c3305
204 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 7

  • 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.
  • Image lure linking to an SEO redirector (free-download phishing) high PDF_SEO_UTM_REDIRECTOR_LINK
    PDF embeds an image with little or no body text and a clickable link to a multi-word utm_term / FeedBurner-proxied SEO redirector — the 'free ebook / solution-manual / document download' phishing family that ranks for natural-language search queries and routes the user into a payload/redirect chain. The PDF carries no exploit; the risk is the linked destination. Flagged structurally (image lure + SEO redirector) so it does not depend on a ClamAV/ML signature, and regardless of how many filler text pages the lure carries.
  • 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://druttle.ru/wb?keyword=learn%20english%20speaking%20app%20free%20download PDF link annotation
    • http://trixy-matrix.space/63387011943imwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4484375/normal_5ff38bc8332b2.pdfIn PDF document text
    • https://zavowajasobi.weebly.com/uploads/1/3/1/4/131406950/94198e5bfa4c7fe.pdfIn PDF document text
    • http://liko-sneakers.com/ludotizqz7ju.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4393631/normal_6000a70c2c943.pdfIn PDF document text
    • http://trujillostacoshop.com/xulujovipupukudilqx9qh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460946/normal_5feb24397ab15.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/wudibirewuduto/25786823129.pdfIn PDF document text
    • https://s3.amazonaws.com/resabomibogodaw/45526842026.pdfIn PDF document text
    • https://s3.amazonaws.com/dusined/bed_sets_king_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/kopisigapub/8160_avery_template_excel.pdfIn PDF document text
    • https://s3.amazonaws.com/geradi/bomalesa.pdfIn PDF document text
    • https://s3.amazonaws.com/fokapikow/lizavabumapinatolu.pdfIn PDF document text
    • https://s3.amazonaws.com/ganubifirigevi/anonymously_report_osha_violations.pdfIn PDF document text
    • https://s3.amazonaws.com/penefelomiju/profile._dat_dls_19_koin.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_off0000f039.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF039 5400 bytes
SHA-256: 724a87cf8070532469a71fbf76f4f038c58a03e8fc8cb2934581aa6714a46948
font_01_sfnt_off000102ac.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102AC 10464 bytes
SHA-256: e86bf4b1a7f389e92b7dd3223a928247cd9c2ec45ade84fba553ca4a93d3fc3d

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