Malicious PDF — malware analysis report

Static analysis result for SHA-256 c6cb2f37a6a2fd05…

MALICIOUS

PDF

64.8 KB Created: 2021-02-21 18:19:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 1790239eb4d27b350fd209ac3eda0ed6 SHA-1: 36f229ce0e23a2000309c03a41ca286414ec6c64 SHA-256: c6cb2f37a6a2fd051bc00e455e510cb3d3f0aee407fb2b45ede501d7caf319fd
76 Risk Score

Malware Insights

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

This PDF document was flagged as suspicious by an ML classifier. The file embeds external URLs that direct users to attacker-controlled resources. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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.
  • 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://baarspo.ru/123?utm_term=repair+mopeds+near+me PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4387808/normal_5fe060a382417.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426263/normal_5fcdd0b9f023b.pdfIn PDF document text
    • http://naykaryadom.fun/sojibobebitukifomlhyh.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451766/normal_5ff784cd8813e.pdfIn PDF document text
    • http://form-lnstagramverificationbadge.com/calculus_1_kenyatta_universitybu8zq.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4370054/normal_5ffbe233bec80.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4421218/normal_5fedcc02021d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4406455/normal_5fc6cfc695c7d.pdfIn PDF document text
    • http://chatik85939775.fun/wuperelupewijuwedixah3zuf.pdfIn PDF document text
    • http://bupro.asia/7710716878897hik.pdfIn PDF document text
    • http://how2clever.com/sekorekoberenapam6jc93.pdfIn PDF document text
    • http://swiss-gear.shop/27972107532kh12d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453563/normal_6027d94016bd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413566/normal_602e8112f21b1.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/nowonovege/delajukosusekenu.pdfIn PDF document text
    • https://s3.amazonaws.com/rekawexuretowo/97974999478.pdfIn PDF document text
    • https://s3.amazonaws.com/sowirutelevolur/reading_comprehension_worksheets_high_school.pdfIn PDF document text
    • https://s3.amazonaws.com/mexavofezoxi/photoshop_psd_designs_free.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_off0000c309.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC309 5080 bytes
SHA-256: ac26c7487f48e604c973817084696ce23a7524644c1f91ad350f45341878bc36
font_01_sfnt_off0000d43b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD43B 10080 bytes
SHA-256: 909a4e649c82ffc62dc7f150af25dacf82859b33d1443edc63754b01858b1c5c