Malicious PDF — malware analysis report

Static analysis result for SHA-256 77c96554fbcfd5dc…

MALICIOUS

PDF

68.8 KB Created: 2021-02-07 00:42:04 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-04-10
MD5: a305951346db18232d86dd8d297ddf91 SHA-1: 191954793f2c82bf1e4efeb01f56e1d34af99704 SHA-256: 77c96554fbcfd5dc1b2a0f5d3f1f5d5c897d9c5a4c840cb242e53738a9cbaac4
196 Risk Score

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • 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=lista+de+verbos+irregulares+en+ingles PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4393358/normal_5fd74f9581786.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4451021/normal_5ff69eddec569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445877/normal_5ff1e6c20f1c9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387410/normal_5fe6ef9149e1a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366389/normal_60116e3c441fb.pdfIn PDF document text
    • https://jebovemedafo.weebly.com/uploads/1/3/0/8/130813903/ea98b45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420449/normal_6019db4f389ad.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449779/normal_5fe9c63c58950.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386836/normal_5fd885658514a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418401/normal_600a947d4e11e.pdfIn PDF document text
    • https://widowajezow.weebly.com/uploads/1/3/4/5/134584852/8634009.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413109/normal_5fe148222f5d9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366048/normal_5fcbc2a0df540.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4406793/normal_601dd5954aa57.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/fibesezati/majesty_piano_sheet_music.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_off0000cea7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEA7 5136 bytes
SHA-256: 0dea3c22a01b484711b273309d60751b1476031f8fe85911213973b7007dfcda
font_01_sfnt_off0000e037.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE037 11200 bytes
SHA-256: 235998f26a64e70ecdbb7f45eb77c8abdc0b2eb754d85781bab99ad529092b7c