Malicious PDF — malware analysis report

Static analysis result for SHA-256 5d726d93a0d97f6b…

MALICIOUS

PDF

35.0 KB Created: 2020-04-28 09:23:06 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 61b418b973d7e40088752885063f11d8 SHA-1: eea7c83e8174715310367eca9636cbae57eadd64 SHA-256: 5d726d93a0d97f6bc2112c9e9a32cc0b2d9242ab89cf40c759b49d5f212f8b5d
96 Risk Score

Malware Insights

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

The PDF file contains numerous external links, a common tactic for SEO link farms and potentially malicious redirects. The heuristic 'PDF_SEO_LINK_FARM' indicates a deliberate attempt to create a large number of links to other PDF files, likely for SEO manipulation or to host malware. While no scripts were directly extracted, the presence of embedded URLs and the ML classifier's high confidence suggest malicious intent, possibly involving JavaScript execution or redirection to malicious content.

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://kcbevco.com/uploads/1/3/0/5/130590567/130590567.html#poster+making+app+android
    • http://monicamontefusco78.com/uploads/1/3/0/4/130483953/db2b0d60da39.pdf
    • http://marriedlifecoaches.org/uploads/1/3/0/3/130379604/680596bf1cdd.pdf
    • http://infernopolishes.com/uploads/1/3/0/4/130476563/cca4ca3f428.pdf
    • http://pearlstreetconsulting.com/uploads/1/3/1/0/131071286/nodugabozogerovebe.pdf
    • http://mujeres-power.com/uploads/1/3/0/6/130603976/pafidedu.pdf
    • http://reliableiptvstreams.com/uploads/1/3/0/3/130379740/7341817.pdf
    • http://3005highland27.info/uploads/1/3/0/3/130323599/d616e0.pdf
    • http://jaredfedgerton.com/uploads/1/3/1/3/131398134/8104f6ab81f5.pdf
    • http://richardmcraelawyer.com/uploads/1/3/1/6/131606556/8835882.pdf
    • http://healthappyfitnesstraining.com/uploads/1/3/0/5/130550777/2322680.pdf
    • http://texasfuryfootball.com/uploads/1/3/1/4/131407736/6412551.pdf
    • http://millenniuminternational.biz/uploads/1/3/1/4/131437484/7892934.pdf
    • http://virtualprofessionalresumes.com/uploads/1/3/0/2/130289406/c4219af0f0.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_off0000638f.bin
645c742fde576d48065e0b3917bbb627057e122670e6f8e6dde5a930c110fe40		 pdf-font-stream PDF embedded font (sfnt) at offset 0x638F 7196 bytes

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