Malicious PDF — malware analysis report

Static analysis result for SHA-256 9db612a86c9db9d8…

MALICIOUS

PDF

73.6 KB Created: 2021-02-15 06:30:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 39b998eb4bbfbfe073f7b19dbe5fe261 SHA-1: ac24fe9711999e1687f7ea8e3457bf7f3a15caa2 SHA-256: 9db612a86c9db9d8eb29fca7d49e50524b5337e585a97cbbb8aa760c087954bf
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 0.9997

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 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://leonvi.ru/aws?utm_term=commandos+strike+force+free++utorrent PDF link annotation
    • http://funseeds.site/free_powerpoint_greeting_card_template1j22m.pdfIn PDF document text
    • https://sepuvomaxobaba.weebly.com/uploads/1/3/5/3/135311468/1c9fd05f77d2e3d.pdfIn PDF document text
    • https://sabidodavo.weebly.com/uploads/1/3/1/4/131408103/kipetatifemogosapiza.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366647/normal_600c84da4c5db.pdfIn PDF document text
    • https://latapelubatute.weebly.com/uploads/1/3/5/9/135960370/zedelenaz.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374847/normal_6029d10e4944e.pdfIn PDF document text
    • https://mezovojexojija.weebly.com/uploads/1/3/0/8/130874002/rutagikajok-fikuneje-zuvusem-wisifexevugu.pdfIn PDF document text
    • http://good-production18.site/seesaw_family_app_sign_in7e6i0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4477892/normal_5fc7992d0cf57.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/nefomojuwet/medical_terminology_book_answers.pdfIn PDF document text
    • http://fokozagizek.rf.gd/64534758523.pdfIn PDF document text
    • http://gofosuxubajo.epizy.com/kufotilizilet.pdfIn PDF document text
    • https://s3.amazonaws.com/tesodagiwor/viveniwemudoj.pdfIn PDF document text
    • https://s3.amazonaws.com/jeponowon/netbeans_tutorial_free.pdfIn PDF document text
    • http://pabaxonewopux.epizy.com/bunagefevafutop.pdfIn PDF document text
    • https://s3.amazonaws.com/janodojivi/guia_ceneval_exani_ii_contestada.pdfIn PDF document text
    • https://s3.amazonaws.com/zetituri/gb_whatsapp_messenger_app_for_android.pdfIn PDF document text
    • https://s3.amazonaws.com/gasodamuza/best_combat_training_guide_osrs.pdfIn PDF document text
    • https://s3.amazonaws.com/zemigiduwagafu/aparato_respiratorio_organos_y_funciones.pdfIn PDF document text
    • https://s3.amazonaws.com/rufonali/79927390048.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_off0000de8d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE8D 5104 bytes
SHA-256: 12355660f3aa9e935737edd91911fde17b6e806d29c9402cc25a0a7684e36cf9
font_01_sfnt_off0000efd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD1 13084 bytes
SHA-256: 65b4a1ddefcd1b9f56787debebb3e6bebe5e8bcb856bb73729bd8d1c3066920b

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