Malicious PDF — malware analysis report

Static analysis result for SHA-256 413a6149b4bfa48a…

MALICIOUS

PDF

68.8 KB Created: 2020-12-11 13:34:30 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-26
MD5: 213ab8da06249e8f22ccf960d8cd43d0 SHA-1: 1d1827eefcc6356e9d06c4d6047ab387545deec4 SHA-256: 413a6149b4bfa48ad09827e50879ebb737a3a254721a3fd2a157e1710a795cc8
156 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ML classifiers and ClamAV, specifically identified as a phishing trojan. It contains a large number of external links, many of which point to SEO-optimized PDF files, suggesting a link farm or redirection scheme. The embedded URLs likely lead to malicious content or phishing sites, aiming to exploit users who are lured by the document's apparent educational content.

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
  • 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://trafffi.ru/aws?utm_term=3+year+old+worksheets+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4471985/normal_5fade780dcf0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490974/normal_5fa9a443f0ecf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481168/normal_5fb40d68cab62.pdfIn PDF document text
    • https://mimasalidapu.weebly.com/uploads/1/3/4/4/134466186/mutamafenako-gomube.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379491/normal_5fb2ca3b9c361.pdfIn PDF document text
    • https://kagivosivozavex.weebly.com/uploads/1/3/4/7/134746508/tubuve.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411717/normal_5fa61fdcb3210.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4502493/normal_5fc0c345ddf71.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/dotivaf/layers_of_atmosphere_worksheet.pdfIn PDF document text
    • https://s3.amazonaws.com/bezegoluzose/stream_team_tv_apk.pdfIn PDF document text
    • https://s3.amazonaws.com/mesotodimus/jifakubijobogifijatenose.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d9238ed4-fae5-41cc-b492-284bc7a707b1/bikotuje.pdfIn PDF document text
    • https://s3.amazonaws.com/zamuriza/pekomukejufuja.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_off0000d05d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD05D 5456 bytes
SHA-256: 839a1f59aac894dd838a0261044d4c43919478a8984ebb56418bf38e830c475e
font_01_sfnt_off0000e2fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2FE 10376 bytes
SHA-256: 1ee9fa2d4b8a3cdd26e4be7e80d344eb7e60021ff0df01371fd15021000ba7e6

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