Malicious PDF — malware analysis report

Static analysis result for SHA-256 3cdac0978a66e81d…

MALICIOUS

PDF

74.8 KB Created: 2021-03-09 02:37:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: 792b7c2f25624b2369e3b429a909f66e SHA-1: 6b154598db7cb9da7a359277dc18ce9b81db6edd SHA-256: 3cdac0978a66e81df20657ebfd76034104f23f44c79fe4cd9e1c2bedc444d9b1
64 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a lure for invoices or payments, and also contains embedded URLs. The ML classifier strongly flagged this PDF as malicious. The presence of embedded URLs suggests the document is designed to redirect the user to malicious sites, likely to download further payloads or phish for credentials.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • Callback phishing phone lure medium SE_CALLBACK_LURE
    Document asks the user to call a phone number in billing, refund, subscription, fraud, or security context — consistent with callback phishing or tech-support scam patterns. Suppressed for legitimate-issuer (IRS/gov/official-form) documents that carry no urgency or charge/dispute escalation.
  • 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://dugedepap.ru/strik?utm_term=5%252F3+bank+routing+number+cincinnati PDF link annotation
    • https://cdn.sqhk.co/kezinujus/cicoShi/rukebodarobaxiwesugafu.pdfIn PDF document text
    • https://cdn.sqhk.co/ludukuni/RGZOGii/beatevo_yg_2020.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4454303/normal_5fca3e7844050.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4444096/normal_5fd6630d41e4e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367668/normal_603e45ea74dbc.pdfIn PDF document text
    • https://cdn.sqhk.co/sarimotel/Thctjju/best_deals_on_apple_watch_series_5_canada.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416929/normal_5fc6496d1520b.pdfIn PDF document text
    • https://cdn.sqhk.co/xevowuto/i1Vheib/uncertainty_avoidance_culture_definition.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476939/normal_60066d99444da.pdfIn PDF document text
    • https://cdn.sqhk.co/lubometusoz/41jcQnY/why_helicopter_have_2_rotors.pdfIn PDF document text
    • https://cdn.sqhk.co/sidamebo/i3iczgh/wind_hero_apk_home.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4443356/normal_60314961654f8.pdfIn PDF document text
    • https://cdn.sqhk.co/velujuvaxal/iOWaQLq/free_printable_preschool_graduation_certificate_templates.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460232/normal_6030f9b5b7874.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388038/normal_6026ac5a9b591.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404310/normal_603389ddb1226.pdfIn PDF document text
    • https://cdn.sqhk.co/zimopaji/hMPSkha/arrow_going_up_png.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/vutame/93435383769.pdfIn PDF document text
    • https://s3.amazonaws.com/tonemakopinibem/psychology_11th_edition_myers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c695b215-5de4-4dc0-a044-0535eb861628/95985089419.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/02cdad08-66ee-489b-9aa5-1b1201694cd1/mozuzujupusafekejopaz.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_off0000e492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE492 5340 bytes
SHA-256: eefdc8cf203812a24dbe7bed0d38c0e9f2ee893cb245271dc400b1c75cfb872a
font_01_sfnt_off0000f6bf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6BF 11776 bytes
SHA-256: 7824d6b3815555dc287bd0e614888fc4284efb325a91630d5919a7b9df8f4445

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