Malicious PDF — malware analysis report

Static analysis result for SHA-256 83bc647f8ffffc11…

MALICIOUS

PDF

71.4 KB Created: 2020-11-10 21:44:37 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-14
MD5: 7ac86767f6412ef42dbb194965736a7f SHA-1: da34a5939a2941fa6051326b1879b88430207bd3 SHA-256: 83bc647f8ffffc112bf6a637cf0ac1ed3ddd1734f3a421806548f3b80e36f8bb
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many of which point to redirector infrastructure and potentially malicious content, as indicated by the 'PDF_MALICIOUS_REDIRECTOR_LINK' and 'PDF_SEO_LINK_FARM' heuristics. The ML classifier and ClamAV also strongly indicate maliciousness. The document body, though heavily obfuscated, suggests a lure related to movie content ('Kinomaniak filmy cale') to encourage users to click on the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://ggtraff.ru/aws?keyword=kinomaniak+filmy+cale In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384832/normal_5fa689a6a8722.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387711/normal_5fa78c5633f0c.pdfIn PDF document text
    • https://gexaxiwiwa.weebly.com/uploads/1/3/4/4/134480231/2190c24521b0c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464323/normal_5fa51a2d4f344.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366009/normal_5f873e15999da.pdfIn PDF document text
    • https://jutawalafomas.weebly.com/uploads/1/3/4/3/134316275/791ec36.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/legenapi/27233726120.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c3991de-73d8-485a-bee1-fa9c6e11c92c/razasirag.pdfIn PDF document text
    • https://s3.amazonaws.com/wujapu/important_full_forms_a_to_z.pdfIn PDF document text
    • https://s3.amazonaws.com/memul/43693066137.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82baf01b-d5d9-4763-99d1-60b310675ae2/79422695392.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_off0000db73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB73 4888 bytes
SHA-256: a58ff2896689cbfd40bf2be5096fed268f2d60a63cf812cf6d03f7b71c50acb4
font_01_sfnt_off0000ec14.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC14 10916 bytes
SHA-256: a3426c2dde497dae6069a3560e02f134b33fe1bbd4077aa026bf00473d38cff7

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