Malicious PDF — malware analysis report

Static analysis result for SHA-256 783034ada2e722e0…

MALICIOUS

PDF

33.2 KB Created: 2020-05-31 11:15:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: b5b5b24c1666fdb6b0b4a6201d75192a SHA-1: d8a7bc2494e6524ec246cee4633711ccb5b7686c SHA-256: 783034ada2e722e0c40927f32bea0a9b41647982f44396b985301b988f852f1d
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file was flagged by an ML classifier as malicious and contains a large number of external links, many pointing to WordPress PDFs. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, suggesting a link farm or redirection tactic. The embedded URL 'http://jcitaipei.org/uploads/1/3/0/6/130620584/130620584.html#objetivo+do+teste+ravlt' is also a potential indicator of malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://jcitaipei.org/uploads/1/3/0/6/130620584/130620584.html#objetivo+do+teste+ravlt
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://tipaxoxabenu.files.wordpress.com/2020/05/rurebaperula.pdf
    • https://tinugezova.files.wordpress.com/2020/05/jomuz.pdf
    • https://lulerodibo.files.wordpress.com/2020/05/ropusavude.pdf
    • https://pegolupoduw.files.wordpress.com/2020/05/duburumogozewabuv.pdf
    • https://lexipawe.files.wordpress.com/2020/05/riralimetokes.pdf
    • https://dijeduzibug.files.wordpress.com/2020/05/mitexosipabosaf.pdf
    • https://jupeveni.files.wordpress.com/2020/05/muporifosifare.pdf
    • https://sulajuxije.files.wordpress.com/2020/05/kalokosukukogiduboripex.pdf
    • https://bujamabak.files.wordpress.com/2020/05/90789522865.pdf
    • https://witinubaxa.files.wordpress.com/2020/05/menesud.pdf
    • https://duzawexosusa.files.wordpress.com/2020/05/dexepipixata.pdf
    • https://neguraxopon.files.wordpress.com/2020/05/zijizutasimanafalomewudid.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_off0000548f.bin
30e6822bbc609758bf60d05db4554036b4ec725d0bf7420c5bd7d75678c56de8		 pdf-font-stream PDF embedded font (sfnt) at offset 0x548F 11748 bytes

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