Malicious PDF — malware analysis report

Static analysis result for SHA-256 5bcd6b78acfe980e…

MALICIOUS

PDF

51.6 KB Created: 2020-03-29 05:39:42 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 1345425b123e0b3a58d26efe3235341d SHA-1: 11eb0fdf455c82996ee99e1213fde435cd650e6d SHA-256: 5bcd6b78acfe980e37601ef86c3b59606f22161c402efc20e4573e068baf2988
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. These links point to various domains, suggesting a link farm or SEO manipulation tactic. While no scripts were directly extracted, the presence of numerous external URLs indicates a potential for redirecting users to malicious content or phishing pages. The ML classifier also strongly flagged this PDF as malicious.

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://www.medinamathlessons.com/uploads/1/3/0/2/130292110/130292110.html#hipotesis+estadistica+definicion+pdf
    • http://somethinghoppy.com/uploads/1/3/0/7/130775137/dulibapezobul-bevapawilibe-zitobovefebew-kovafobebataj.pdf
    • http://mandmsrestaurant.com/uploads/1/3/0/6/130621484/seditebelotem-wifevefumujilu-gabivelagojew.pdf
    • http://mrvangeelsclass.com/uploads/1/3/0/2/130291523/9167712.pdf
    • http://livingwellmassagetherapy.net/uploads/1/3/0/7/130739878/71fffe1.pdf
    • http://chaosdragonboats.org/uploads/1/3/1/4/131406710/sozatetadugaz.pdf
    • http://primitivehomedecorandmore.com/uploads/1/3/0/6/130605258/pegezunux.pdf
    • http://alinehazarian.com/uploads/1/3/0/5/130545434/gulonesomu_sebupapatoguso_samijipomumes.pdf
    • http://artdivine.org/uploads/1/3/0/8/130814216/446bf50b505.pdf
    • http://renu-painting.com/uploads/1/3/0/6/130604476/lodubaxad.pdf
    • http://novific.com/uploads/1/3/1/1/131163857/kalalelixe.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_off00009d23.bin
0bbc0902c1a94d64bb157a64ecaf198e82bb8649c7eaf8e5eb1e8a0b679f3a7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x9D23 9520 bytes

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