Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f4dcda146a24bc5…

MALICIOUS

PDF

70.1 KB Created: 2021-02-13 22:17:39 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-04
MD5: 3f1b4b6bf5d1138a0e4623c77f2e1f9c SHA-1: cb3f7dad649116df28159f7ffaf3267602011c22 SHA-256: 5f4dcda146a24bc58f06b500619fa6353749a015d8f3d8a21d6f0709f4608cfc
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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=sample+executor+letter+to+beneficiaries+uk PDF link annotation
    • https://tupisefam.weebly.com/uploads/1/3/1/3/131383837/saxidej_zalavo_lotipovami_soxix.pdfIn PDF document text
    • http://everydays.space/certificate_of_authenticity_card_templatek7tq2.pdfIn PDF document text
    • http://stebsmeh.space/49702543444mec16.pdfIn PDF document text
    • https://wusitezuredov.weebly.com/uploads/1/3/5/3/135314125/lusava.pdfIn PDF document text
    • https://peruvapi.weebly.com/uploads/1/3/0/8/130813059/benofidozoxo.pdfIn PDF document text
    • https://vebavorosufate.weebly.com/uploads/1/3/4/7/134742301/dobulizinevisogo.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/bevarolimesale/application_store_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/suxugipipolazog/zofodo.pdfIn PDF document text
    • https://s3.amazonaws.com/zoromexemuzid/63184092396.pdfIn PDF document text
    • https://s3.amazonaws.com/vuforewebub/17344061324.pdfIn PDF document text
    • https://s3.amazonaws.com/fekazudabo/classroom_rules_blank_template.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/57602076884.pdfIn PDF document text
    • https://s3.amazonaws.com/moduluzuxikari/xowovadurebazebo.pdfIn PDF document text
    • https://s3.amazonaws.com/waxegatulo/browserling_com_whatsapp_open.pdfIn PDF document text
    • https://s3.amazonaws.com/wazotojemov/bonafide_letter_format_for_student.pdfIn PDF document text
    • https://s3.amazonaws.com/sorogamat/concise_math_class_9_answers.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_off0000d64a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD64A 5536 bytes
SHA-256: d770bc2f70e42716ebd4516d092a8ba9998ab21229448ba124672acbb7369428
font_01_sfnt_off0000e906.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE906 9964 bytes
SHA-256: e069534a8445334e08ee7aabf2a9c6552ea858d0a1ac7951f5497737dca516e4

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