Malicious PDF — malware analysis report

Static analysis result for SHA-256 3b5772a8d723c344…

MALICIOUS

PDF

71.9 KB Created: 2020-12-05 11:33:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-04
MD5: 14667f11a80640df695e529f3a864854 SHA-1: d781bf261cf6b35050c9118839c284a39be64a35 SHA-256: 3b5772a8d723c344c344902056db6bbcbc5e078cd99111e7f5ef132e7e5d05ed
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 0.9998

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://traffine.ru/123?utm_term=bus+to+dallas+from+okc PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4401983/normal_5fc7d69baf2ce.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369160/normal_5f922ac25ad3c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4461229/normal_5faf968c71eb8.pdfIn PDF document text
    • https://viferoxabuged.weebly.com/uploads/1/3/4/2/134235394/f8e4040ba7.pdfIn PDF document text
    • https://firedisivimi.weebly.com/uploads/1/3/0/9/130969818/5809249.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480891/normal_5fad6d4328f88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477408/normal_5fafe20273038.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366335/normal_5f8a56a1be9da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368951/normal_5fa7386097c25.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476150/normal_5fbb3b94d49ef.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459805/normal_5fbfb9aa4ba58.pdfIn PDF document text
    • https://sobemifukoku.weebly.com/uploads/1/3/4/8/134887972/9a29d2ce8a30b32.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/nijosinizo/moboxe.pdfIn PDF document text
    • https://s3.amazonaws.com/wajufifenoxuj/jobs_worksheets_for_1st_grade.pdfIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/blue_ring_legend_of_zelda_nes.pdfIn PDF document text
    • https://s3.amazonaws.com/setikizo/approval_sheet_dlsu.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_off0000da6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA6F 5280 bytes
SHA-256: 667e1acbe36a6fa653289c75e94f63bd49b8d49bc611480a81e842d68f3c77e3
font_01_sfnt_off0000ec55.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC55 11240 bytes
SHA-256: 2811cd3903ea22003bb3026f46d7a6044655cae2baa3899f73b0b577ebae01f7

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