Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c1bdebf269584de…

MALICIOUS

PDF

83.0 KB Created: 2021-01-28 12:44:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 2dac3228cf0434ab7a2e627b03627267 SHA-1: 39c242c0c2278750d962ef9c26a0e5ffac6897ad SHA-256: 8c1bdebf269584dea14f4536cdddb4ce1418086e8998288e6323f6018618db34
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by multiple heuristics and a machine learning classifier, specifically flagged as a phishing trojan. It contains a large number of external links, suggesting a link farm or SEO manipulation tactic. While no scripts were explicitly extracted, the PDF structure and embedded URLs indicate an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://leonvi.ru/aws?utm_term=cutting+edge+elementary+cd+free PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4475737/normal_5fdedd471ae6d.pdfIn PDF document text
    • https://cdn.sqhk.co/mowasikuso/9xdvifG/13728365769.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413242/normal_5fe501c18bffb.pdfIn PDF document text
    • https://cdn.sqhk.co/kixowijeka/jdibp1n/58537875723.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4476757/normal_5fc6ab083a5d5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4499984/normal_5fcb156da9a04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371809/normal_5fda8cffd3936.pdfIn PDF document text
    • https://xeruterone.weebly.com/uploads/1/3/2/6/132680908/lewisuvufemute-govunurujuramow-rojiwet-jasofuxoboloxe.pdfIn PDF document text
    • https://bituzuvuzi.weebly.com/uploads/1/3/5/3/135389462/999c85b36f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388620/normal_5fe75b2bc15c7.pdfIn PDF document text
    • https://cdn.sqhk.co/fafaviwi/ih7ghgd/35505995654.pdfIn PDF document text
    • https://panubawo.weebly.com/uploads/1/3/5/3/135337149/nanelonefebibu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450519/normal_600f76e1b0dd9.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474450/normal_5fcf6b0e692a8.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4489409/normal_5fc7fd6b8e0a6.pdfIn PDF document text
    • https://cdn.sqhk.co/kaxonavi/iicuRij/virginia_diner_restaurant_menu.pdfIn PDF document text
    • https://wibugosavuzatug.weebly.com/uploads/1/3/4/3/134349607/pewiroxugozokob-busujikezabum.pdfIn PDF document text
    • https://cdn.sqhk.co/losokifape/ewhijdv/test_computer_virus_online.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000fe0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE0C 5172 bytes
SHA-256: defc7d14e0790d434a371e0bcdb83e934762000423bcb150850ecd451c5374a7
font_01_sfnt_off00010f94.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F94 15068 bytes
SHA-256: ed1f11bb44a6a126fde1c3cc815ea00f13dbcb79184f1d4224a1b359df4fa40e

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