Malicious PDF — malware analysis report

Static analysis result for SHA-256 6810426d68ceb3c8…

MALICIOUS

PDF

35.3 KB Created: 2020-06-02 13:56:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 31c44c2fee2fb664143ce12274f7edd9 SHA-1: 2b4d64a37afe538a8dfaf6d626976e36bd87a940 SHA-256: 6810426d68ceb3c889924ebdbbc7b5c1b95a0968343939f3076b09f2b945fa39
96 Risk Score

Malware Insights

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

The PDF document contains a large number of external links to other PDF files hosted on various domains, a technique often used for SEO manipulation or to distribute malicious content. The ML classifier strongly indicated maliciousness, and the presence of embedded URLs further supports this. While no scripts were explicitly extracted, the structure suggests a potential for JavaScript execution within the PDF to facilitate the redirection to these external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://phylexgreen.com/uploads/1/3/0/5/130588463/130588463.html#dnd+wizard+tower
    • http://kerumunan.net/uploads/1/3/0/3/130313345/8d03b9.pdf
    • http://socaljobs.net/uploads/1/3/0/4/130483370/b7a1fd1fc701f3.pdf
    • http://technicianscore.com/uploads/1/3/1/3/131380438/84c0e4f3d8.pdf
    • http://crownjulesofhair.com/uploads/1/3/1/0/131070591/be1615d.pdf
    • http://arnoldofacton.com.au/uploads/1/3/0/5/130552073/babididiwe_levimuweb.pdf
    • http://tlphotography.org/uploads/1/3/0/6/130640162/galanepamumenunuwup.pdf
    • http://phylexgreen.com/uploads/1/3/0/5/130588463/terms.html
    • http://phylexgreen.com/uploads/1/3/0/5/130588463/dmca.html
    • http://phylexgreen.com/uploads/1/3/0/5/130588463/policy.html
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://pinijerazod.files.wordpress.com/2020/06/19030632629.pdf
    • https://vavimanuda.files.wordpress.com/2020/05/14397735146.pdf
    • https://pekakupesile.files.wordpress.com/2020/05/guvurura.pdf
    • https://zivuwisi.files.wordpress.com/2020/05/36850513822.pdf
    • https://luperixul.files.wordpress.com/2020/05/nutifobijagovifitekofefe.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/
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005e59.bin
37476431686058213c75d3d97856c6bf07e7d985b6a097b8bdc6d9d8e5b6ffe5		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5E59 10092 bytes

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