Malicious PDF — malware analysis report

Static analysis result for SHA-256 7d0b38b0c2258f0b…

MALICIOUS

PDF

41.3 KB Created: 2020-04-24 21:40:25 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 8458b17f0667611f17ecc75a23e95805 SHA-1: 4042476993e4b103975517b573c4b8a5f13e071e SHA-256: 7d0b38b0c2258f0b90d88ec7ec8611c0285954c23c614b69a1780f0fcbb91887
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded external links, many of which point to suspicious domains. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external PDF links, suggesting a link farm or redirection scheme. While no scripts were directly extracted, the presence of numerous external URLs and the ML classifier's high confidence score point towards malicious intent, likely to redirect users to potentially harmful content or phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

Heuristics 4

  • 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 http://al-takfir-al-sihriu.net/uploads/1/3/0/9/130969707/130969707.html#bavarian+apple+tart+cream+cheese+springform
    • http://xn--crationdragon-chb.ca/uploads/1/3/0/8/130814432/5560372.pdf
    • http://cokidstherapy.com/uploads/1/3/0/5/130588658/gisafirekaxebaw.pdf
    • http://cozycabinsva.com/uploads/1/3/0/6/130620340/f57478446066d.pdf
    • http://nutritionbyzest.com/uploads/1/3/0/6/130620384/beee7cda.pdf
    • http://briannedempsey.com/uploads/1/3/1/4/131406681/vunaw.pdf
    • http://kyndallspalacellc.com/uploads/1/3/0/7/130776763/nigigaj.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00007b29.bin
0993172e42bc8b821adc05f833a59f75a97eb5b9d42d7cb60bbc09c094d42d77		 pdf-font-stream PDF embedded font (sfnt) at offset 0x7B29 7788 bytes

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