Malicious PDF — malware analysis report

Static analysis result for SHA-256 2cbb6a764a1457d1…

MALICIOUS

PDF

41.9 KB Created: 2020-03-31 04:43:23 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 0cddfd77cc5f0668760787b6924ae7f9 SHA-1: 6758eec8bcffe1ba5180ea83183e87840a4e0bd4 SHA-256: 2cbb6a764a1457d151afa3559542906b0cc58b386fb905565c8a165cbab2be6a
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many of which point to similarly structured URLs on different domains. This behavior is characteristic of SEO spam or a link farm designed to manipulate search engine rankings or redirect users to malicious content. The document body, though partially corrupted, contains text related to a book review and references wkhtmltopdf, suggesting it was generated programmatically to host these links.

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://officerethink.com/uploads/1/3/0/5/130551585/130551585.html#rese%C3%B1a+literaria+del+libro+de+la+perla
    • http://10dayscreditboost.com/uploads/1/3/0/4/130436222/9bde47654f0c2a4.pdf
    • http://edmondpartners.com/uploads/1/3/0/8/130813997/a4697.pdf
    • http://simpleclaritymovespurpose.com/uploads/1/3/0/2/130287991/jugetunarilova.pdf
    • http://alexisreneedreams.com/uploads/1/3/0/2/130292104/1198711.pdf
    • http://local689matters.com/uploads/1/3/1/4/131406855/kokawegufulo.pdf
    • http://auspoolsandspas.com/uploads/1/3/0/6/130639436/5943665.pdf
    • http://tinathaimassage.com/uploads/1/3/0/7/130740022/ragedixotip_jisodefigimig_zejoli_nuxig.pdf
    • http://thebasementjapanesegallery.com/uploads/1/3/0/8/130813546/186802ecde6ab.pdf
    • http://westafricalnggroup.com/uploads/1/3/0/6/130640179/9499816.pdf
    • http://arkansasclubvolleyball.com/uploads/1/3/0/4/130476229/82e31995d4.pdf
    • http://stjohnstottington.org.uk/uploads/1/3/0/2/130289679/d4528a43c3f473.pdf
    • http://themondayy.com/uploads/1/3/0/3/130313253/aec5948.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_off000078c1.bin
436ad7172f220a52c67c59d9f29ac98995a05d30f2b71042a7d0c272fd941910		 pdf-font-stream PDF embedded font (sfnt) at offset 0x78C1 8844 bytes

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