Malicious PDF — malware analysis report

Static analysis result for SHA-256 f33ea58f44b006a5…

MALICIOUS

PDF

62.3 KB Created: 2021-01-11 02:46:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 950ca4f16762547cbfa9f62fb23d0c4a SHA-1: ed5dd8592ffbd1d1774acd63055a31572ba58da6 SHA-256: f33ea58f44b006a58bd97d5f286b51a1e64b0e4d201481e65b9d85fc1ec50913
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9996

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 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.
  • 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://traffset.ru/123?utm_term=holt+spanish+1+capitulo+5+gramatica+2+answers PDF link annotation
    • https://cdn.sqhk.co/bitomasijelo/heZhjNo/small_business_continuity_plan_example_word.pdfIn PDF document text
    • https://cdn.sqhk.co/likamigid/igu8hbx/pibisajesa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5ff763b75cd14.pdfIn PDF document text
    • https://cdn.sqhk.co/loxepafigav/jgAjdqW/nick_cordero_waitress.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387226/normal_5faf13d67a4e2.pdfIn PDF document text
    • https://pekumovulimezel.weebly.com/uploads/1/3/4/3/134363026/fotula_rupufupemave_xibukuvupu_makipagadisaje.pdfIn PDF document text
    • https://cdn.sqhk.co/reserujaj/EkhgZHX/75058460240.pdfIn PDF document text
    • https://kekulepolunan.weebly.com/uploads/1/3/4/8/134889268/adab1b005103a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367621/normal_5fa2fac8adb65.pdfIn PDF document text
    • https://cdn.sqhk.co/lewivapawo/ijgdYji/raniwegeribawanita.pdfIn PDF document text
    • https://www.slader.com/subjIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bevekizadoxuj/tapunonobujopabewesu.pdfIn PDF document text
    • https://s3.amazonaws.com/pusori/kikubigapiwapetisepoti.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_off0000b386.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB386 5708 bytes
SHA-256: 86b97389957867c56d31ad7f271d9d2b3dd5b0441e17e661e33cbdecca4674e4
font_01_sfnt_off0000c6e8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E8 11340 bytes
SHA-256: db4b006a88e92981473f484d11819cf3644d57fc3dabc9e7063c6f55251b1df0

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