Malicious PDF — malware analysis report

Static analysis result for SHA-256 6c7144e13b4daed7…

MALICIOUS

PDF

36.1 KB Authoring application: Karbon
MD5: 2e5d7835995032e5cce2564627f705c2 SHA-1: b9a4e9517dd3c936483c60d96a55de79a722386c SHA-256: 6c7144e13b4daed778bd434eccd04bae5e99b4ddf99749ec64bf8aea47206dff
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links to external websites, masquerading as a performance appraisal document. The ClamAV detection and ML classifier strongly indicate malicious intent, likely to redirect users to phishing or malware distribution sites. No scripts were extracted, but the PDF structure itself facilitates the attack by hosting numerous URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • 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.
  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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://klubok-modno.ru/uploads/2020/01/28/5411188.pdf
    • http://fopezel.zhivoy-mir.ru/uploads/2020/01/29/2168203.pdf
    • http://satellit55.ru:80/uploads/2020/01/28/7850611.pdf
    • http://penninsulatech.com/uploads/1/3/0/4/130435738/kaxeputexenagapa.pdf
    • http://kitug.lucky-opros.info/uploads/2020/01/28/dovoragedamaraxos.pdf
    • http://sharpexteriors-ar.com/uploads/1/3/0/5/130590295/rivisutojexaxepez.pdf
    • http://fogakan.vipiski-besplatno19.icu/uploads/2020/01/27/2703444.pdf
    • http://vep.1-gc.net/uploads/2020/01/29/631ce72b0aa2c.pdf
    • http://phaze1online.com/uploads/1/3/0/5/130590463/fakinabobo.pdf
    • http://nuohotel-zh.devsite-1.com/uploads/1/3/0/6/130604326/130604326.html#performance+appraisal+document+template

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000011d4.bin
84c4e63fab667f9f984c7ec59f88b6c584467db8b78ec6123566552043d01cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11D4 8068 bytes

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