Malicious PDF — malware analysis report

Static analysis result for SHA-256 ff219cae53dacaf6…

MALICIOUS

PDF

41.9 KB Created: 2020-04-19 09:57:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6) First seen: 2021-06-04
MD5: c617ccf3a16c0b542341ded5e2ea6cc1 SHA-1: b267560d33aa5b55a068398ba9a582e914ddf8e7 SHA-256: ff219cae53dacaf60ba3e4d2b08e8c84bd572dcfbe97a0833abf9e7d5abb3e41
96 Risk Score

Malware Insights

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

The PDF contains numerous links to external websites, many of which are structured as SEO-optimized PDF link farms. The document body, though heavily obfuscated, contains a URL that mirrors the 'arm exercises with bands pdf' theme, suggesting a lure for users to visit malicious sites. The ML classifier strongly flagged this PDF as malicious, indicating a high probability of malware distribution or phishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://rslangpottery.com/uploads/1/3/0/2/130287997/130287997.html#arm+exercises+with+bands+pdf PDF link annotation
    • http://detailedgrandeur.com/uploads/1/3/0/6/130604947/1887246.pdfIn PDF document text
    • http://soloptometry.com/uploads/1/3/0/5/130588503/nevapijokam_laxumor_nemowazoxib_xavedewi.pdfIn PDF document text
    • http://jb2tcamp.com/uploads/1/3/0/4/130476396/7aefe.pdfIn PDF document text
    • http://lazulitacomunicacao.com/uploads/1/3/0/7/130738769/9683993.pdfIn PDF document text
    • http://haus-abendsonne.org/uploads/1/3/0/7/130776229/selad.pdfIn PDF document text
    • http://simpletransactions.net/uploads/1/3/1/3/131381679/netuzab.pdfIn PDF document text
    • http://reddoodledesigns.com/uploads/1/3/0/2/130271126/1545200.pdfIn PDF document text
    • http://glogalbrand.com/uploads/1/3/0/7/130776142/83a8afa1.pdfIn PDF document text
    • http://duepiunews.com/uploads/1/3/0/5/130589373/rizotabixif.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00006801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x6801 7632 bytes
SHA-256: af7a339b247da0199dadd913c767b644d6b5cb23097ab498a7321b3f54a5fd9f
font_01_sfnt_off000085d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x85D7 16312 bytes
SHA-256: 1d1fa5121415f8f5353993473374918b9d2a38f433752094af4cce5d3be72c8c

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