Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c88f0571da4755f…

MALICIOUS

PDF

67.4 KB Created: 2021-02-07 09:54:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-25
MD5: d8680e9c612c0a50de58caecb883406e SHA-1: dd3c228fe9a8fd2f8155cb1b88fc81de6957175e SHA-256: 9c88f0571da4755f34ad0e156371523a72dfefe3cbdd1291e1972d4614a425f2
244 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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://crophysi.ru/wb?keyword=booze%20and%20glory%20carry%20on In PDF document text
    • https://cdn-cms.f-static.net/uploads/4404502/normal_5fe9ca244b65e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_601f864033fc6.pdfIn PDF document text
    • https://gedibaforajipet.weebly.com/uploads/1/3/0/8/130874683/3832432.pdfIn PDF document text
    • http://study-english-04.space/40550419583gr2nj.pdfIn PDF document text
    • https://pejilajapife.weebly.com/uploads/1/3/4/4/134477767/9471972.pdfIn PDF document text
    • https://rinafudafize.weebly.com/uploads/1/3/5/2/135293322/tasukula.pdfIn PDF document text
    • https://nimivisedasefu.weebly.com/uploads/1/3/1/0/131070972/tuzur.pdfIn PDF document text
    • https://bizavewes.weebly.com/uploads/1/3/5/3/135323934/e4e9c6360f59.pdfIn PDF document text
    • http://mamontov-net.cc/taper_turning_formula6gnwo.pdfIn PDF document text
    • https://nonovobuzodeku.weebly.com/uploads/1/3/5/3/135348203/1917374.pdfIn PDF document text
    • https://gikesusemu.weebly.com/uploads/1/3/4/7/134775173/doxuk.pdfIn PDF document text
    • https://jodeliloku.weebly.com/uploads/1/3/5/9/135975589/faxoxijafapan_danazezal.pdfIn PDF document text
    • https://jazawimap.weebly.com/uploads/1/3/5/3/135346256/f75e155a6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366010/normal_5fe2541b21172.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/wulotugadag/42278281466.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_off0000cb55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCB55 5132 bytes
SHA-256: c40a338df529b1315c55331ec0c72a15e27dfaa941114103243c9d08968b64ed
font_01_sfnt_off0000dcee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCEE 10504 bytes
SHA-256: c9b84e7636dd33c10c1217f68004463ebb78861b7b8ba7e71e90378020ff1cf1

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