Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b0b175ce5b0a607…

MALICIOUS

PDF

55.3 KB Created: 2020-04-11 03:46:29 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 3b7b5e794013c6d62cabcfe1b2f682e3 SHA-1: f43be2fde720886ae8c5728bd387e0824902e5d3 SHA-256: 5b0b175ce5b0a60708b90201c478bfa7b424ec1286e21e72cc647d1923f944a1
96 Risk Score

Malware Insights

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

The PDF contains numerous external links, many of which are structured as a link farm, suggesting an attempt to drive traffic to malicious or scam websites. The presence of a specific lure 'Kasper trial reset' in one of the URLs reinforces the phishing or scam nature of the document. While no scripts were explicitly extracted, the PDF structure and extensive external linking are indicative of malicious intent, likely to redirect users to a compromised or malicious site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9923

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://michaelshusko.com/uploads/1/3/0/8/130813533/130813533.html#kasper+trial+reset
    • http://allianceoneconstruction.com/uploads/1/3/0/6/130640047/cc92a087f.pdf
    • http://brewyourselfsd.com/uploads/1/3/0/6/130604933/miwogenawasobedono.pdf
    • http://studioksandb.com/uploads/1/3/0/7/130739564/78b14c969.pdf
    • http://bloomergentlemenssociety.com/uploads/1/3/0/8/130813650/4195276.pdf
    • http://juliegmoreland.com/uploads/1/3/0/5/130539922/8d0253.pdf
    • http://ecolecobaux.be/uploads/1/3/1/6/131606739/mutadudozipidit.pdf
    • http://brandiestonefinancial.com/uploads/1/3/0/6/130620389/b40a2e4.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://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00009ef6.bin
bb78da1ec18042148fbe7c30231d65679394066dcf5b16cba6d03d17a4b91c6f		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x9EF6 28512 bytes
font_00_sfnt_off00008157.bin
e3f90a1ebd0e761458d42278d1c61f371e14671ddebd6f475f4cadb74e503762		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8157 7784 bytes

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