Malicious PDF — malware analysis report

Static analysis result for SHA-256 37a80559c6188395…

MALICIOUS

PDF

69.2 KB Created: 2020-11-12 19:24:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 85ea7139ea82b3b20b2f1c3f0eca1a17 SHA-1: 169de20fb2a4305d34a444640265103b713a8a46 SHA-256: 37a80559c6188395c9b6b2000277c09a37922351da46b9987390bd175d16a81d
214 Risk Score

Malware Insights

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

The PDF contains embedded links that redirect to a URL associated with malicious redirector infrastructure, as indicated by the PDF_MALICIOUS_REDIRECTOR_LINK heuristic. The document body, though heavily obfuscated, contains text suggesting a lure for downloading software. The presence of a link farm further supports a phishing or malware distribution attempt.

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
  • 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?utm_term=download+zuma+deluxe+full+version+fo In PDF document text
    • https://cdn-cms.f-static.net/uploads/4422145/normal_5fa70e2385320.pdfIn PDF document text
    • https://kavanezeso.weebly.com/uploads/1/3/4/4/134477356/677197.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476302/normal_5faa3de0eea49.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373502/normal_5fa66d7d0b011.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402297/normal_5f97ec948108d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366336/normal_5f8da415e83fe.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393626/normal_5f92ae1a00ba3.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ba707ee-5786-4de4-be1d-dd6035a96d66/ps3_hdmi_handshake_fix.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a07d06f-adb3-4669-b58d-44628ea1f3cd/gunutebojob.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c437dd9b-4d52-4895-bfe2-0f664e74a4dc/80377979576.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d7077663-5f3b-4318-b8e1-7a4a5acd5914/dugalewu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77885c90-e3a5-4392-9cbc-d26453ca3b62/fifepovomafujefowa.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_off0000d22f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD22F 5320 bytes
SHA-256: a2fca3388d585c3040c73427f5098e913c86b1924c8b45e8a256940c943b517e
font_01_sfnt_off0000e45f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE45F 10412 bytes
SHA-256: 50d1b9e3f47f19363b17ab5a47d133e4c7f7ea36d43996f08ce6b32c26a25398

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