Malicious PDF — malware analysis report

Static analysis result for SHA-256 1bd6228c090af155…

MALICIOUS

PDF

72.5 KB Created: 2020-12-25 09:48:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: 9b332ade4ec0d47203e774a14fe3a364 SHA-1: 286d3e25e8849e319409cef33653f1d66eefd030 SHA-256: 1bd6228c090af15559e575f36c089c131a556a017ede6fd0369ff8c40206220c
154 Risk Score

Malware Insights

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

The PDF contains a link disguised as a search result for cover letter templates, which redirects to a known malicious domain. This indicates a phishing attempt to lure users to malicious infrastructure. The ML classifier and ClamAV detection strongly support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://cctraff.ru/aws?utm_term=does+google+docs+have+cover+letter+templates In PDF document text
    • https://cdn-cms.f-static.net/uploads/4403262/normal_5f999169f12af.pdfIn PDF document text
    • https://donodofi.weebly.com/uploads/1/3/1/8/131856097/zusoluwifivelefasefo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4415950/normal_5f9997dc7f336.pdfIn PDF document text
    • https://tavumake.weebly.com/uploads/1/3/2/7/132740551/vazefobizesekewe.pdfIn PDF document text
    • https://xopaluwejur.weebly.com/uploads/1/3/1/8/131857284/7524844.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460980/normal_5fcd1436132cf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418984/normal_5fd635a0d1a2f.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/579ccad7-97be-4853-801b-b0f0e5f5a9b9/fofakejibaw.pdfIn PDF document text
    • https://s3.amazonaws.com/nademopor/reduction_of_carboxylic_acid_to_form_alcohol.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/60b87d2b-7491-442b-97c9-a0efc798a71d/six_sigma_book.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_off0000debb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEBB 5544 bytes
SHA-256: 8879e450f34e53144dbabb5f69569e501319bae42e9765dd88ce1c151861704f
font_01_sfnt_off0000f17f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF17F 10440 bytes
SHA-256: 82f088a2676abfd0bf952bf9afcabcf52b1597935dcd0afff4184a29ab31f3fa