Malicious PDF — malware analysis report

Static analysis result for SHA-256 5c11b51574cadf6f…

MALICIOUS

PDF

64.0 KB Created: 2020-11-09 23:42:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 5be541448f8870424b6d0f185e22794b SHA-1: dfc04ba5044f846631565114c63e56f56adf5b43 SHA-256: 5c11b51574cadf6fcd2e935799a500de53c62d88536256e80110cb255b549465
214 Risk Score

Malware Insights

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

This PDF file contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The document body, though heavily obfuscated, contains keywords suggesting a lure related to 'minecraft build ideas yt'. The presence of multiple external PDF links and a critical heuristic firing for a malicious redirector indicates a phishing or malware distribution attempt.

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://cctraff.ru/strik?keyword=minecraft+build+ideas+yt In PDF document text
    • https://cdn-cms.f-static.net/uploads/4376870/normal_5fa5c6ee53655.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378846/normal_5f8b91a8abcf5.pdfIn PDF document text
    • https://dowamiwimeguv.weebly.com/uploads/1/3/0/7/130775936/wuselafo_wasokalovudobom_devuwediwosas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365600/normal_5fa91103eb718.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383807/normal_5fa6fd1acb842.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367650/normal_5f874a1622f4f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365536/normal_5f8735d15f7f4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393180/normal_5fa2336f223fd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372074/normal_5f8f2404d72a8.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/4eb5f89c-5609-4469-ad45-9b4935b1e7f6/rajek.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9144f15e-01ed-48a0-9cbc-47f1c3b717b7/zapata_y_la_revolucin_mexicana.pdfIn PDF document text
    • https://s3.amazonaws.com/henghuili-files2/carillas_de_resina_indirectas.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000b209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB209 5032 bytes
SHA-256: a06f6b16a7acd5c3a98b9c0c41207081f840b964aa596877891226a5ec2fc7d3
font_01_sfnt_off0000c32c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC32C 9860 bytes
SHA-256: 1b9eaafb9d81e1a788b2950c30e31c2afcba4f327145c8fc45c8de869a180f58
font_02_sfnt_off0000e4c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4C8 4324 bytes
SHA-256: b50a2106bf82917db0cd3cf88f63c5e8cc3298b343ace5cffc591b35df33d24c

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