Malicious PDF — malware analysis report

Static analysis result for SHA-256 66d6719bcac9db51…

MALICIOUS

PDF

38.6 KB Created: 2020-06-15 15:42:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 84b3a838fd696eea29958fbfb13da0f1 SHA-1: 6cbfc48ca3aedc47ab66d376461cf5ead5321e79 SHA-256: 66d6719bcac9db51a0c95452ac237e29459495265f61a1e94ed5d3e200666195
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, identified by the PDF_SEO_LINK_FARM heuristic. The document body, though partially corrupted, also contains URLs and text related to 'breast exercises', suggesting a deceptive lure. The ML classifier strongly flagged this PDF as malicious, indicating a high likelihood of malicious intent, possibly for SEO spam 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://siyaosiwangluoqipaiyouxi.br3h.com/uploads/1/3/1/0/131070293/131070293.html#breast+exercises+to+lift+and+firm
    • http://scubaphone.org/uploads/1/3/1/0/131070805/3016477.pdf
    • http://blindforce.com.au/uploads/1/3/1/4/131437322/2445516.pdf
    • http://elio.live/uploads/1/3/0/6/130621503/3124079.pdf
    • http://bodyrehabgympdx.com/uploads/1/3/0/8/130814597/resiguja.pdf
    • http://trashyverbiage.com/uploads/1/3/1/1/131163890/9305660.pdf
    • http://mail.jocelynmccauley.com/uploads/1/3/1/3/131381021/gazefasorenawix_wipegowo_rexelumid_kopinatabudo.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://disepujunipe.files.wordpress.com/2020/06/jivusoxaxavabad.pdf
    • https://pipojomit.files.wordpress.com/2020/06/89554677819.pdf
    • https://ruzulujaso535019409.files.wordpress.com/2020/06/debalifebi.pdf
    • https://duvopafoge.files.wordpress.com/2020/06/60577725263.pdf
    • https://metiwelujipe.files.wordpress.com/2020/06/60139868718.pdf
    • https://tazaradoz.files.wordpress.com/2020/06/buxoxukenivafibutib.pdf
    • https://sekizil.files.wordpress.com/2020/06/dugazabitutajelosezadaxu.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_off00006d11.bin
9e944535ebc6ed9316c811785de8306baa72215acb96f264c30fe5cea36d83f8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D11 9992 bytes

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