Malicious PDF — malware analysis report

Static analysis result for SHA-256 034808326b8ccce4…

MALICIOUS

PDF

34.1 KB Created: 2020-06-21 02:54:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: dd4bf71e2f3c88039a742f79330d39fe SHA-1: 5c12b5b7ea672815144722988c558218a33153a3 SHA-256: 034808326b8ccce467a59998efc783c246adb041df2c69365a7df1c5d7c6920c
96 Risk Score

Malware Insights

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

The PDF document contains a large number of embedded links, identified as a link farm, pointing to various external domains. The ML classifier strongly flagged this PDF as malicious, and the presence of numerous external links suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure itself facilitates the embedding of URIs which are likely used to redirect the user to malicious content.

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://va-hardscapes.com/uploads/1/3/2/7/132710677/132710677.html#inventor+professional+tutorial
    • http://baileesbest.com/uploads/1/3/0/6/130605230/fusavalujak-navomazuwudob-nunuz-tejudigowipaga.pdf
    • http://shoppingwithshannontoday.org/uploads/1/3/0/2/130289411/mezaxubuxorobofufur.pdf
    • http://mta-sts.mail.woodleytheatre.org/uploads/1/3/0/2/130272361/wigomekoviw_difurugege_garaxufuromija_nelenigamebebe.pdf
    • http://bistro-napoli.com/uploads/1/3/0/3/130313729/supose.pdf
    • http://jgriegoinsurance.com/uploads/1/3/0/2/130288492/6196611.pdf
    • http://31i.undesirable.us/uploads/1/3/0/7/130738762/4193537.pdf
    • http://smclothing.co.uk/uploads/1/3/0/6/130604728/158f87.pdf
    • http://wolfecityhomecoming.com/uploads/1/3/0/3/130379049/vigira.pdf
    • http://peopleinsyncltd.com/uploads/1/3/0/3/130313002/9468924.pdf
    • http://thegifttalk.com/uploads/1/3/0/6/130620961/e67c097e.pdf
    • http://mikequienalty.net/uploads/1/3/2/6/132682040/a85b7b716ba29.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • 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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00004d59.bin
cda43fa5f49eb37c340c5633423018b9832a41874c23017053375c4ad8d2c28f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x4D59 4776 bytes
font_01_sfnt_off00005d9c.bin
8daf790f4e999a6c00c259bc9e3a1b7c59e4b9d901f4cad46f0861cee54cdd92		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5D9C 8920 bytes

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