Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ebe39bf433495b3…

MALICIOUS

PDF

68.5 KB Created: 2020-12-04 06:44:44 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 0af9cab449c9b0e986a6498a9dd889fc SHA-1: 09ab4f0b895c8fff9305d19b42ca88f9c0c4f7fd SHA-256: 4ebe39bf433495b3ef40a3a0dcb15dd9dc2da60e28acf120d9305b44eb48a152
214 Risk Score

Malware Insights

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

The PDF contains numerous embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or SEO-based link farming. Although no scripts were extracted, the PDF structure itself facilitates the malicious redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://traffine.ru/aws?utm_term=gina+2019+asthma+pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4374537/normal_5f9361802f3d4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4499023/normal_5fb8933524529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385648/normal_5f9132ad2b3b0.pdfIn PDF document text
    • https://wosufixojiniki.weebly.com/uploads/1/3/4/7/134720754/1b365b44504c5.pdfIn PDF document text
    • https://dedezeke.weebly.com/uploads/1/3/4/4/134494225/5552431.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426075/normal_5fbbecf16e940.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383165/normal_5fa148d4513c5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426954/normal_5f9b826d05af5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365619/normal_5f91e3c8a8f1e.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/04a29537-8948-45c9-92eb-43f77a21402b/71871795885.pdfIn PDF document text
    • https://s3.amazonaws.com/fosagobomap/hunter_i_core_manual_operation.pdfIn PDF document text
    • https://s3.amazonaws.com/zugutixe/personality_test_disc.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_off0000ced9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCED9 5664 bytes
SHA-256: 73b3015b4a0a7dfcf5a4f0c69c0189d8d7fb9c6612c3fcff78c78009e3c739dc
font_01_sfnt_off0000e202.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE202 10460 bytes
SHA-256: eaff4f747a18aae88d5a487dbf1770706f2225700835e5b74d1b6bae388c509a

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