Malicious PDF — malware analysis report

Static analysis result for SHA-256 b1b8229489ac73bb…

MALICIOUS

PDF

73.4 KB Created: 2020-12-22 23:58:47 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: 1cc0acef1ffdad39761d7477be0c9d23 SHA-1: 74345ec89ee2e8bf4dade53946510de2bc1997d3 SHA-256: b1b8229489ac73bbdc666fd781c5a2cab2aa02cc318ba77388a6806a9aaecf55
96 Risk Score

Malware Insights

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

The PDF was flagged by a machine learning classifier and ClamAV as malicious, with ClamAV identifying it as a phishing trojan. An external URI pointing to 'traffset.ru' was extracted, suggesting a redirection to a malicious site. The document body contains obfuscated text, and the authoring application 'wkhtmltopdf' is sometimes used to generate malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://traffset.ru/strik?utm_term=motorcycle+racing+2019+uk PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4481663/normal_5fb5b93609c7c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388424/normal_5fbb4833d6f4c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408702/normal_5f94761f5f42c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4393508/normal_5f8e8cb1d93dc.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413125/normal_5fdad4e4e4b3e.pdfIn PDF document text
    • https://jewojumafolu.weebly.com/uploads/1/3/4/6/134651010/dajabas.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421460/normal_5fda26b8017aa.pdfIn PDF document text
    • https://dupasaku.weebly.com/uploads/1/3/4/2/134235895/7210210.pdfIn PDF document text
    • https://viweposedijul.weebly.com/uploads/1/3/1/0/131070314/togijeg_laxunujezovo_xorovaba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371787/normal_5fa5db004bf9f.pdfIn PDF document text
    • https://lepitosamodovax.weebly.com/uploads/1/3/4/3/134335454/9487793.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/90a00ba8-63d9-4140-a98c-ccd77e67435d/lowes_assessment_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1c9c2d31-356b-44b0-86d5-f8381497814c/dugijotir.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fdcabee0a190b16b315d1db/t/5fdcebe1e80c450cee363b8b/1608313829881/sezofinuwofarugara.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc15a4327a199023ab881d8/t/5fc95faad96bfb41173aafc0/1607032746448/dodek.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_off0000df56.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF56 5440 bytes
SHA-256: 3c627a54ce630b02555959e2a19af3d4431225a0b433e8471669ac3a3ccb03f3
font_01_sfnt_off0000f20d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF20D 10976 bytes
SHA-256: dacfc1127796df3490320e272e648d6393c999e636a2628ed7847b24f0aaf09f

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