Malicious PDF — malware analysis report

Static analysis result for SHA-256 35688f3a3b03baa6…

MALICIOUS

PDF

68.6 KB Created: 2020-11-10 18:32:52 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: c3a8d121f7aaf0542a7785ba58eb4eb5 SHA-1: b100242b578ad364c8b51b87275e28b696824864 SHA-256: 35688f3a3b03baa6cb054344087ce6216a6fe60cbafd95042c7fc2604c44fe24
156 Risk Score

Malware Insights

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

The PDF file contains embedded URLs and a heuristic firing indicates a link farm, suggesting a phishing or malware distribution attempt. The document body, though heavily obfuscated, contains text related to 'emulator online mortal kombat 4', which is likely a lure to direct users to malicious external sites. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://trafffe.ru/aws?keyword=emulator+online+mortal+kombat+4 PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426558/normal_5fa2a67b2910d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4404965/normal_5f9d281431758.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374963/normal_5f897f0c13dbd.pdfIn PDF document text
    • https://zijananuwale.weebly.com/uploads/1/3/4/4/134438714/1116b062e.pdfIn PDF document text
    • https://dudikojegak.weebly.com/uploads/1/3/1/4/131406444/poxuxemotuxedar.pdfIn PDF document text
    • https://xosotujusosevo.weebly.com/uploads/1/3/4/3/134377620/lomepefofegalu_salodubejabu_sanase_xizufeju.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373517/normal_5f9ade616b6ba.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/c89e29e0-1840-4179-8d03-48908a0f5417/harrisons_manual_of_medicine_19th_edition.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8e6ecf1a-bac3-4fc1-ad3a-35142f57be82/nutricion_clinica_y_dietoterapia.pdfIn PDF document text
    • https://s3.amazonaws.com/liwafo/fazon_uhc_ip.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_off0000c27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC27E 4784 bytes
SHA-256: afe66644b9e528b25efe6170f859e5520409af3ea3143e8c902e1dc7d0bcedf6
font_01_sfnt_off0000d2a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD2A9 10860 bytes
SHA-256: df3df727629965d32b7fbc48139798673abcbe99a0d855db869cb7ff633985a8
font_02_sfnt_off0000f7a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF7A4 4324 bytes
SHA-256: 05d2457133b820fa77aa358e30e9acfbad3f04c46ced9a37296d9311117db176

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