Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f96a2f9b5b2f525…

MALICIOUS

PDF

36.4 KB Created: 2020-04-06 10:48:31 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: ba0920bda86746ee3ab8a3ebce8ce326 SHA-1: a70face240e07a7a604fffc08d5d69aadba71339 SHA-256: 5f96a2f9b5b2f525e9183e9ac7ef5fa3fc869dfcacfbcb6399048db7ae9c4c3f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, identified by the PDF_SEO_LINK_FARM heuristic. The ML classifier also strongly indicated maliciousness. While no scripts were explicitly extracted, the structure suggests a link farm or SEO manipulation tactic, potentially leading to malicious content or phishing pages. The primary attack pattern observed is the distribution of numerous URLs, likely intended to direct users to external, potentially harmful, resources.

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://nedtech.net/uploads/1/3/0/5/130550846/130550846.html#amelia+bedelia+peggy+parish
    • http://freedome.org/uploads/1/3/1/4/131438758/vigoxurakapewim.pdf
    • http://photobooth11.com/uploads/1/3/0/6/130605447/logini.pdf
    • http://madelinefphilbeck.com/uploads/1/3/0/6/130621839/jugesajesar.pdf
    • http://loveandlighthealingarts.com/uploads/1/3/0/5/130551219/4089553.pdf
    • http://badandboujiebodyproducts.com/uploads/1/3/1/4/131437253/a451803.pdf
    • http://beinhim.com/uploads/1/3/0/6/130621666/8f075.pdf
    • http://conner-and-dana.com/uploads/1/3/0/2/130289648/riras_koxoriwiwo.pdf
    • http://piscinasnaturalesespana.com/uploads/1/3/0/3/130313358/lakezevotalu_damafapijaxa.pdf
    • http://speakeasyedc.com/uploads/1/3/0/4/130435938/4885669ab8.pdf
    • http://healthfullyyoursnutrition.com/uploads/1/3/0/8/130813132/juwure_tirebuzenisewax_xukadatisixiz.pdf
    • http://kmwhittemore.com/uploads/1/3/0/6/130640042/buzem-sulevitovon.pdf
    • http://leakdetection.info/uploads/1/3/0/5/130588639/bipate-kodevibi-zapenobire.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_off000066a8.bin
797ae681922f491b2fe3ee7c34cdbb137ddbf5a5aaee9e9f8dc00ccef40ffc5c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66A8 7776 bytes

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