Malicious PDF — malware analysis report

Static analysis result for SHA-256 1422e58c28507da1…

MALICIOUS

PDF

36.4 KB Created: 2020-04-16 06:32:07 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: a252af3ed381e43d5320bedaa3bc31f5 SHA-1: 6ab3324110c7cccc35c911a7c688c9c7630cdf2f SHA-256: 1422e58c28507da176f12a6df27abf9b26f2b4b6bb2449dfd9532b17ce349295
96 Risk Score

Malware Insights

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

The PDF contains a mass of external links, many of which are disguised with numeric slugs and appear to be part of a link farm. One prominent link is embedded within text referencing a movie title, suggesting a lure to trick users into clicking on malicious URLs. The ML classifier strongly flagged this PDF as malicious, supporting the assessment of a malicious redirection attempt.

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://liceotomasmorales.com/uploads/1/3/1/3/131379965/131379965.html#beeruva+full+movie+hd++telugu
    • http://strand58.com/uploads/1/3/0/2/130272925/2630690.pdf
    • http://patleeart.com/uploads/1/3/1/3/131398077/830468.pdf
    • http://carolinakelso.com/uploads/1/3/0/4/130476276/2716338.pdf
    • http://ambercolemanmortley.com/uploads/1/3/0/5/130588546/771165a.pdf
    • http://torontostarsc.com/uploads/1/3/0/7/130776684/471a28440.pdf
    • http://imamjob.com/uploads/1/3/1/3/131383761/lomafefeb-bitebipival.pdf
    • http://anonymouslens.com/uploads/1/3/0/2/130289625/6726365.pdf
    • http://tsgserve.com/uploads/1/3/0/2/130288447/4184570.pdf
    • http://tiffanytieche.com/uploads/1/3/0/7/130776572/jawaj.pdf
    • http://mawitechsupport.com/uploads/1/3/0/5/130541837/zumut-betavufiveza-vomovaluvet-muzone.pdf
    • http://rivlinnutrition.com/uploads/1/3/0/2/130270902/84524da.pdf
    • http://tdenton.com/uploads/1/3/0/3/130379488/damavirej_zubexa_najijuvojeti.pdf
    • http://tunecitydjs.com/uploads/1/3/0/2/130273843/xevozozetavoza.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_off000066b4.bin
4b75224fd9459fc868289a0cd413472029e5f72a0da3cf6bcdd6f36d0a8eaf20		 pdf-font-stream PDF embedded font (sfnt) at offset 0x66B4 7860 bytes

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