Malicious PDF — malware analysis report

Static analysis result for SHA-256 5f289b5437c22b83…

MALICIOUS

PDF

38.3 KB Created: 2020-04-11 04:02:22 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 87a864cf17a57cc60cb135f7dba49038 SHA-1: 6cfea11fde5611d43e023e4931a300b5688efc9e SHA-256: 5f289b5437c22b83fe68afb4cc3ba42522748855740ce76231d1f2fc40b9d50f
96 Risk Score

Malware Insights

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

The PDF contains a large number of embedded external links, suggesting a link farm or redirection to malicious content. The ML classifier strongly indicated maliciousness. While no scripts were directly extracted, the PDF structure and numerous external URLs point towards a malicious intent, possibly to distribute further payloads or engage in SEO abuse.

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://sweetestdreams.org/uploads/1/3/0/8/130874393/130874393.html#soja+newest+album
    • http://ritewayrides.com/uploads/1/3/0/6/130639891/raxirinisorun.pdf
    • http://homelessadvocacycenter.org/uploads/1/3/0/5/130590265/0abf8e775.pdf
    • http://aydinscloset.org/uploads/1/3/1/4/131452876/vowasisugovojugiro.pdf
    • http://silverrivercoaching.com/uploads/1/3/1/4/131438629/latax.pdf
    • http://park100building131.com/uploads/1/3/1/4/131452869/1978404.pdf
    • http://ollieandtheheathen.com/uploads/1/3/1/3/131398440/3706978.pdf
    • http://poweryourcore.com/uploads/1/3/0/5/130551253/2357261.pdf
    • http://madnests.com/uploads/1/3/1/3/131380811/gaberilu.pdf
    • http://gurveshkaur.com/uploads/1/3/0/6/130620435/zofov.pdf
    • http://sweetsmilebrigaderiagourmet.org/uploads/1/3/0/3/130313087/6938923.pdf
    • http://eastgateinstitute.com/uploads/1/3/0/4/130435945/nufine.pdf
    • http://lelakicoklat.asia/uploads/1/3/0/6/130639215/ruwejukata-xesuraged-ziradasob-xuzogoxofowa.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_off00006ed9.bin
572ad6cff0732854d8bd6c511b79b9a1ab532bf3332e72dcb51a1c7037b87ae6		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6ED9 7984 bytes

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