Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b24b4da9945597b…

MALICIOUS

PDF

70.9 KB Created: 2021-01-12 00:08:18 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: 0dc6b5dd1b461d0d07af2c27d9c51eda SHA-1: 7a1ec4d9672d179e04b2e5d068107bde1ed7507a SHA-256: 4b24b4da9945597b894657f038baa3bbf7e8df45ae5fff02d0dc36f8662be7aa
156 Risk Score

Malware Insights

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

The PDF document contains numerous external links, many of which are hosted on link farms and point to other PDF files, suggesting a phishing or SEO poisoning campaign. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of a malicious document designed to redirect users to potentially harmful 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://trafffe.ru/aws?utm_term=call+recorder+app+for+android+2.+3 PDF link annotation
    • https://cdn.sqhk.co/bogulevim/zjcDgc5/photo_transfer_app_for_windows.pdfIn PDF document text
    • https://wubudonujekud.weebly.com/uploads/1/3/4/5/134524452/1225970.pdfIn PDF document text
    • https://niraniki.weebly.com/uploads/1/3/4/6/134662237/2b9033d4212880.pdfIn PDF document text
    • https://cdn.sqhk.co/nomavunut/hicrttF/titopovugokoluka.pdfIn PDF document text
    • https://cdn.sqhk.co/voxedifi/QCpghCh/labexuxipepinogetuxak.pdfIn PDF document text
    • https://cdn.sqhk.co/seponidozit/hfjhVEG/countryballs_wiki_japan.pdfIn PDF document text
    • https://site-1178101.mozfiles.com/files/1178101/66756949010.pdfIn PDF document text
    • https://cdn.sqhk.co/jekuzedu/rwT0gi7/14225219940.pdfIn PDF document text
    • https://cdn.sqhk.co/libegavezu/fLigdM8/nizenuj.pdfIn PDF document text
    • https://site-1178304.mozfiles.com/files/1178304/hearts_of_iron_5_cheats.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/dakebesuvum/58209316652.pdfIn PDF document text
    • https://s3.amazonaws.com/sukedil/tagoridojofuwonavujoko.pdfIn PDF document text
    • https://s3.amazonaws.com/julaxel/fuxepekasidawelixe.pdfIn PDF document text
    • https://s3.amazonaws.com/tobobowu/application_format_for_leave_in_office.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_off0000d9b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B2 5204 bytes
SHA-256: 1638c6c1474eef23130d17d5ec6bcbc3964ac27aeee7d33ed270b5ad3bfc9807
font_01_sfnt_off0000eb7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB7F 10320 bytes
SHA-256: 265069dd16e31f4f42a8764fa28e582687712e6d8956cc40b796c2e922e5b473

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