Malicious PDF — malware analysis report

Static analysis result for SHA-256 91fcd108274d8a58…

MALICIOUS

PDF

41.2 KB Created: 2020-05-20 00:15:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: f7f76b589bfe636a9f8a185566ef481e SHA-1: 9878896d1bff2e1ba013dc96680516c24a42eaea SHA-256: 91fcd108274d8a58d4c300b2feb3dcd488a06e866ade084cfae8b465e290d1db
94 Risk Score

Malware Insights

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

The PDF contains a large number of external links pointing to a network of SEO-optimized PDF files hosted on various domains. This technique is commonly used to distribute malware or engage in phishing by directing users to malicious content. The ML classifier strongly indicated maliciousness, supporting this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://blackmagicchimneysweepent.com/uploads/1/3/0/6/130639599/130639599.html#unforgiving+a+northern+hymn+plot
    • http://sweeterthansugarq8.com/uploads/1/3/0/4/130476086/3234346.pdf
    • http://freyby4.com/uploads/1/3/0/6/130621213/5fb64fb.pdf
    • http://highscoreconsulting.com/uploads/1/3/0/7/130738998/zijazisediw-wufimulodolora.pdf
    • http://garenterprise.com/uploads/1/3/1/0/131069843/7275965.pdf
    • http://nwdogretreat.com/uploads/1/3/0/6/130639706/lanodevaduxunas.pdf
    • http://laurenleeart.org/uploads/1/3/0/8/130874585/9714009.pdf
    • http://candywaisted.com/uploads/1/3/0/2/130273987/zubaridavedefurad.pdf
    • http://axistenceoutdoor.com/uploads/1/3/0/5/130541465/e342fb99185912.pdf
    • http://caliberpt.com/uploads/1/3/0/9/130969587/b9edfd50f77.pdf
    • http://ospreypointesandestin.com/uploads/1/3/0/7/130775884/4360404.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_off0000757d.bin
e5c6e7628a1476ddc01509f253658c53d0e360528f590128edddc326a5c2865b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x757D 10828 bytes

Open this report in the interactive analyzer, or submit your own file for analysis.