Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f21fc69aed3879d…

MALICIOUS

PDF

32.2 KB Created: 2020-05-13 03:02:09 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: 9ea9a89e929df67136fd751644ef99ca SHA-1: 4aadbd43075497dca460b46b4279903a33ab033f SHA-256: 6f21fc69aed3879de40537712064b8504a62eedf1ed379f5a7a3b36c6f4eeacd
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded external links, a technique often used for SEO manipulation or to redirect users to malicious sites. The ML classifier strongly indicated maliciousness, and the PDF_SEO_LINK_FARM heuristic confirms the presence of a link farm. The primary IOCs are the numerous external URLs embedded within the document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://ggmmonterd.com/uploads/1/3/1/6/131606233/131606233.html#everfi+ignition+choosing+a+computer+answers
    • http://tasteoforovalley.org/uploads/1/3/0/4/130489144/7877179.pdf
    • http://sweethomealamama.com/uploads/1/3/1/4/131437548/jisetetijoxuka.pdf
    • http://signalsolutionstx.com/uploads/1/3/1/3/131384599/dunotu.pdf
    • http://alexandercranewriter.com/uploads/1/3/0/5/130543019/xofal-dolojad-siponazatat.pdf
    • http://jstrucksales.com/uploads/1/3/0/7/130775892/2117563.pdf
    • http://aquapropressurewashing.org/uploads/1/3/1/4/131483108/5b69f9f37a04.pdf
    • http://yanayogis.com/uploads/1/3/1/3/131383380/1272276.pdf
    • http://suzannevincze.com/uploads/1/3/1/4/131454116/wovugevadefepudeli.pdf
    • http://latchment.com/uploads/1/3/0/6/130605256/mukawibu.pdf
    • http://www.thevillageherbcellar.com/uploads/1/3/1/4/131406434/kagojizovegifor.pdf
    • http://nigelcronin.com/uploads/1/3/1/3/131384547/rajujujesonu.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 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00005340.bin
da4a5b3b13d1ecd2c861026448b48e7c8ec036c1872dbda0081e1e5a0cdff3e2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5340 10132 bytes

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