Malicious PDF — malware analysis report

Static analysis result for SHA-256 2f8388381f73f40a…

MALICIOUS

PDF

36.1 KB Authoring application: Pdftk
MD5: d9229fc72922f2b3ca2aa33b25e73a02 SHA-1: e72c41f1c3d0381607c0c1ae33eaed84cf62c19f SHA-256: 2f8388381f73f40a38f12c0fb3f3a6cf057f93d519cb33a40857943c1cc76121
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, as indicated by the PDF_SEO_LINK_FARM heuristic. These links point to other PDF files hosted on various domains, suggesting a link farm or a distribution mechanism for malicious content. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted from this sample, and the document body contained mostly garbage data.

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://landmark-audio.com/uploads/1/3/0/5/130551434/kululit_lawapamejafobi_zinilezemu_duguzurowofopu.pdf
    • http://theyearsbestwedding.com/uploads/1/3/0/7/130739474/vojesewo.pdf
    • http://chaletalpemassif.com/uploads/1/3/0/7/130775746/zadefeku.pdf
    • http://www.rentwon.com/uploads/1/3/0/4/130483295/jipaku_dogepizo_sapidaru_tawur.pdf
    • http://morningtonpeninsulacaravanstorage.com/uploads/1/3/0/2/130291694/f7177d.pdf
    • http://leadershipcv.net/uploads/1/3/0/6/130620624/wabuwot-tadex-levor.pdf
    • http://culturacirca.com/uploads/1/3/0/6/130604310/ff953ea884.pdf
    • http://tiantianboshishicai.br3h.com/uploads/1/3/0/5/130542773/vufaritexifulom-zevuwevadideku-zakudibefo-rixunu.pdf
    • http://thecaptainslady.com/uploads/1/3/0/5/130541402/votoje.pdf
    • http://gowlands.com/uploads/1/3/0/5/130588427/3302601.pdf
    • http://livingfashions.net/uploads/1/3/0/4/130476586/775a7e9.pdf
    • http://naturalbirthingjoy.com/uploads/1/3/0/6/130604940/punekumuwise-mojimetema-kijefebunofe.pdf
    • http://laketanglewood.net/uploads/1/3/0/2/130289711/a66deacad3.pdf
    • http://unique-security-solutions.com/uploads/1/3/0/4/130488891/130488891.html#asus+rt-ac68u+dual+band+wireless+ac1900+gigabit+router

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000034be.bin
9c19637a90b83acef299f597ccd87bfdbcf5f8ea6941733f0599b537815ceb28		 pdf-font-stream PDF embedded font (sfnt) at offset 0x34BE 7556 bytes

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