Malicious PDF — malware analysis report

Static analysis result for SHA-256 73b9a491d53d996e…

MALICIOUS

PDF

55.8 KB Authoring application: ImageMagick
MD5: 4577cb2072c1777b757278763e92b2c9 SHA-1: 9e232b9d2784df50b7691fc8f2936b2b89616559 SHA-256: 73b9a491d53d996e8d051f130f27982c40c590471d293dd1404ad65fb96da00b
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URLs pointing to other PDF files, a technique often used for SEO spam or to distribute further malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure itself facilitates the redirection to numerous external resources.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://10thirtychoir.org/uploads/1/3/0/6/130621292/madokowosup-xupuwivojigax-tivubovamuk-nesebojum.pdf
    • http://rexusconsulting.com/uploads/1/3/0/5/130550681/4eb0d5efda8dfb.pdf
    • http://fijedowixe.1331.wtf/uploads/2020/01/27/vofawosetid.pdf
    • http://mydetailguyinc.com/uploads/1/3/0/6/130605421/pugimum-sumopiwipam.pdf
    • http://kumo.changeurself.win/uploads/2020/01/28/7616792.pdf
    • http://moscowshamrocks.com/uploads/1/3/0/2/130271042/5690540.pdf
    • http://besinfinityinspections.com/uploads/1/3/0/3/130313458/rezekezejozes.pdf
    • http://thecompassionateasskicker.net/uploads/1/3/0/6/130620781/f9f758c833cce5.pdf
    • http://taxogetid.cserv.org/uploads/2020/01/29/1ae187063.pdf
    • http://lanechnge.org/uploads/1/3/0/6/130639488/c2d84900.pdf
    • http://vaj.bestpodsolnuh.ru/uploads/2020/01/28/xusizerotixexiwalep.pdf
    • http://allergy.mediutopia.com/uploads/1/3/0/5/130588874/130588874.html#guardian+university+guide+business+management

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001390.bin
7994df748c5c81871ae8fc3e0d74d8d69df4651d294fa0293bcb8bc1c53628da		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1390 7848 bytes

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