Malicious PDF — malware analysis report

Static analysis result for SHA-256 0a2c18d167c31f6a…

MALICIOUS

PDF

78.9 KB Created: 2020-03-16 13:28:36 +02:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: dd3a03a452e8fda06bd1ff9170c63e72 SHA-1: 83f63d279587039f430eea7d378f29e13b72dc0f SHA-256: 0a2c18d167c31f6aea14072f7709a87e729867a56928224b2b514d311b75b900
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document was flagged by a machine learning classifier as malicious and contains a large number of external links, indicating a potential link farm or phishing attempt. The presence of numerous PDF links suggests an effort to distribute further malicious content or overwhelm security measures. The document's metadata indicates it was generated by wkhtmltopdf, a tool often used to create PDFs from web content, which can be abused for malicious purposes.

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://xnf6v6.bdgct.com/uploads/1/3/0/4/130436357/130436357.html#the+stages+of+change+model+and+its+use+in+health+promotion
    • http://sanmarinoinhomecare.com/uploads/1/3/0/3/130379548/4cbaedbc.pdf
    • http://squashthis.org/uploads/1/3/0/2/130270823/sazumeme.pdf
    • http://icecreamfundaes.com/uploads/1/3/0/2/130272340/lozebofetaz_watof_jezejazuj_lenujuvubif.pdf
    • http://steveburrowsmusic.com/uploads/1/3/0/6/130622023/vidisifafijavenoma.pdf
    • http://alaskacenterforfasd.com/uploads/1/3/0/6/130621298/465634.pdf
    • http://www.argovia-ducks.net/uploads/1/3/0/6/130639569/wogopowexogagozoga.pdf
    • http://mta-sts.mail.cockburnarchitecture.com/uploads/1/3/0/4/130435503/tadajuvosoranafarite.pdf
    • http://chattanoogacrawlspaceencapsulations.com/uploads/1/3/0/5/130588564/60980591c6e836f.pdf
    • http://nutri-net.fr/uploads/1/3/0/6/130620927/c3ba7547.pdf
    • http://emmak.co/uploads/1/3/0/9/130969363/jogenaw.pdf
    • http://bjw-eq.com/uploads/1/3/0/2/130289628/nilud.pdf
    • http://mta-sts.womansclubofcarlsbad.org/uploads/1/3/0/6/130639662/a3a821cda.pdf
    • http://hostmaster.thecotswoldsgentleman.co.uk/uploads/1/3/0/7/130775639/jepavimibafaro.pdf
    • http://quantsentry.com/uploads/1/3/0/2/130272644/04e81af2.pdf
    • http://ushistoryreport.com/uploads/1/3/0/5/130588843/11d655dac.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_off00010d03.bin
c6e5b07102153de4c8f923e66e6d7c4f453d4d411801ec5a09ad0e6dfeee886f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10D03 8472 bytes

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