Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb7cdd768484366c…

MALICIOUS

PDF

87.5 KB Created: 2021-01-14 13:14:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 4131ececbe9e37617ea98df5b2ea3b12 SHA-1: 9fe023d2526d5c73a0a09eed0871218f545a02a9 SHA-256: bb7cdd768484366c4dcea91bd01b4b67cb6e37b8f64092df3f25095be907837e
156 Risk Score

Malware Insights

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

The PDF file contains numerous external links, including one pointing to 'traffnew.ru', which is flagged as suspicious. The heuristic 'PDF_SEO_LINK_FARM' indicates a large number of external links, suggesting a link farm or phishing attempt. The ClamAV detection and ML classifier further support its malicious nature, classifying it as a phishing trojan.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://traffnew.ru/aws?utm_term=telefon+mobil+alcatel+2008g+manual PDF link annotation
    • https://cdn.sqhk.co/xaranoraf/zifhcgd/azamara_cruises_2020_croatia.pdfIn PDF document text
    • https://gajokemijibefe.weebly.com/uploads/1/3/4/4/134467094/zubuneze.pdfIn PDF document text
    • https://vatilevemuwaji.weebly.com/uploads/1/3/1/4/131453872/6371577.pdfIn PDF document text
    • https://cdn.sqhk.co/kikolibub/8KVZcJC/2664531201.pdfIn PDF document text
    • https://cdn.sqhk.co/nunemiziku/ghRghjg/the_light_between_oceans_book_age_rating.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/fasanag/defiwutuwu.pdfIn PDF document text
    • https://s3.amazonaws.com/tezofuretejom/niwikezukatotef.pdfIn PDF document text
    • https://s3.amazonaws.com/tojazudibumogab/weather_report_laurieton_nsw.pdfIn PDF document text
    • https://s3.amazonaws.com/pexodugosa/74946261549.pdfIn PDF document text
    • https://s3.amazonaws.com/wusone/electrical_system_design_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/nafoxuda/apple_keynote_presentation_templates.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010301.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10301 5484 bytes
SHA-256: 61f02022a524e1df510bf0c520c43e588a2b84c1c10aca652020f70560b25bed
font_01_sfnt_off00011595.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11595 2048 bytes
SHA-256: 2f430097b0e4e500d7174239800a4340685bc181b3707dff1089dac455c017f5
font_02_sfnt_off00011e75.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E75 15964 bytes
SHA-256: e6377ec1a8515f5fac9d66e32456bb363aae9aa3d124bbaed54802ee77948f65

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