Malicious PDF — malware analysis report

Static analysis result for SHA-256 b7467617954c67f5…

MALICIOUS

PDF

74.1 KB Created: 2020-12-22 16:41:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-02
MD5: cfe9a3e54245bd0e575676bb2f7d9a31 SHA-1: 781fe34a34b947cfc1ae0e362f47068056e9c622 SHA-256: b7467617954c67f56acd0ee633ea42bcd36c86d84cdd653a28b03558f5d6b632
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to resources that appear to be part of a link farm designed to manipulate search engine results. One prominent URL, 'https://trafffi.ru/strik?utm_term=spades+plus+free+coins+no+survey', suggests a lure related to online games or potentially a scam. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

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://trafffi.ru/strik?utm_term=spades+plus+free+coins+no+survey PDF link annotation
    • https://buveziketi.weebly.com/uploads/1/3/1/3/131398526/robilamile.pdfIn PDF document text
    • https://tonulolini.weebly.com/uploads/1/3/4/3/134341491/raxuxubiwipo.pdfIn PDF document text
    • https://vofixerexelisat.weebly.com/uploads/1/3/4/3/134311693/wekuwim.pdfIn PDF document text
    • https://zavomafig.weebly.com/uploads/1/3/4/3/134356936/fopadudajebaf.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/wetevali/black_desert_mobile_guide_english.pdfIn PDF document text
    • https://s3.amazonaws.com/xoxaneral/devef.pdfIn PDF document text
    • https://s3.amazonaws.com/lepefi/tricky_conundrums_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/tevomenil/favewikomi.pdfIn PDF document text
    • https://s3.amazonaws.com/zarevizebi/react_native_stylesheet_image.pdfIn PDF document text
    • https://s3.amazonaws.com/bupaxomu/biological_perspective_psychology_examples.pdfIn PDF document text
    • https://s3.amazonaws.com/defujo/css_format_notepad.pdfIn PDF document text
    • https://s3.amazonaws.com/lusegokaves/9770233520.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_off0000e42e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE42E 5416 bytes
SHA-256: f6c6cab9a107b071a05e7e5967c7ca25a56754f6d98e89b279cfced0e184f158
font_01_sfnt_off0000f6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF6B6 10876 bytes
SHA-256: ba4aa3758049f0f1aacc25fbff53401136dcc20637b0749a52a751ecc133af7b

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