Malicious PDF — malware analysis report

Static analysis result for SHA-256 0f99f4ed02d6c32b…

MALICIOUS

PDF

34.4 KB Created: 2020-04-17 13:27:02 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: e4fb2d4d94fda2c15895cfcc4f28d92d SHA-1: da27cdf848148a862359a344d72021ad04170b77 SHA-256: 0f99f4ed02d6c32b869f7d7491dbaebb1ed967fd85d8d0a503a4996854adce92
96 Risk Score

Malware Insights

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

The PDF contains numerous external links disguised as homework answers, a common lure for phishing or malware distribution. The PDF_SEO_LINK_FARM heuristic indicates a large number of these links, suggesting a link farm designed to improve search engine ranking for malicious content. While no scripts were explicitly extracted, the presence of embedded URLs and the ML_NYX_PDF_MALICIOUS firing strongly suggest malicious intent.

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://aqueenwithpurposeshop.com/uploads/1/3/0/6/130604986/130604986.html#mystatlab+homework+answers+statistics
    • http://lazystonerguy.com/uploads/1/3/0/6/130639307/0bf3ad2ec4544.pdf
    • http://sunsetcreeksalon.com/uploads/1/3/0/4/130476859/52f66bd58ed5261.pdf
    • http://kippelectric.com/uploads/1/3/0/4/130488141/3491937.pdf
    • http://mtourproduction.com/uploads/1/3/0/5/130588846/6862b2a8c.pdf
    • http://neptuneinvesting.com/uploads/1/3/0/5/130543025/tedawoj.pdf
    • http://glenfarleystudio.com/uploads/1/3/0/5/130589189/2715ab93deb1a6.pdf
    • http://rockvillepressurewashing.com/uploads/1/3/1/6/131606429/gimed-fogosedaxopax.pdf
    • http://jensainfineart.com/uploads/1/3/1/4/131411688/saxozopisuf.pdf
    • http://silbertnation.com/uploads/1/3/1/0/131069890/6169928.pdf
    • http://my-self-care.com/uploads/1/3/0/6/130639951/42eed9d916.pdf
    • http://sachawilson.com/uploads/1/3/1/4/131408528/vamipufigezez.pdf
    • http://elvissafeandsound.com/uploads/1/3/0/7/130740180/xukumemuvukisijo.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_off00005fca.bin
32ef4596cc27d26d242cf80411afe6850c0dd5aa9a0e0c699b8098d5cb322796		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FCA 7616 bytes

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