Malicious PDF — malware analysis report

Static analysis result for SHA-256 6b6f4a7526451d4b…

MALICIOUS

PDF

40.5 KB Authoring application: Poppler-utils
MD5: 8c88c168ef168a2ac258aa5665bca603 SHA-1: ba7b6d4644d6a2764ce1dc76d6ed5089a6baf3a0 SHA-256: 6b6f4a7526451d4b5dc4b1c0da803618cf81f84e29d69549632919f0a4638646
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file contains a large number of external links, identified as a link farm, directing users to download other PDF files. This behavior is indicative of a phishing or malware distribution campaign. The ClamAV detection and ML classifier further support its malicious nature, classifying it as Pdf.Phishing.TtraffRobotInstall.

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://k-co.shop/uploads/1/3/0/4/130494743/663045fd7216c.pdf
    • http://ketamefo.etalonclinica.ru/uploads/2020/01/29/f5edf52b7d.pdf
    • http://greenblackdress.com/uploads/1/3/0/5/130540619/dusewekerobi-xubenusa-nogoxetuwe.pdf
    • https://gozoromileginav.weebly.com/uploads/1/3/0/5/130539734/vivaxikawotomaxosog.pdf
    • http://photographer-sevastopol.ru/uploads/2020/01/28/7078744.pdf
    • http://safeautokzn.ru/uploads/2020/01/28/vavenum.pdf
    • http://climatetelling.org/uploads/1/3/0/4/130477252/4274946.pdf
    • https://pusuzifavawazu.weebly.com/uploads/1/3/0/6/130604363/lovakenaruvuti.pdf
    • http://vekawus.sexshop-extra.ru/uploads/2020/01/29/pezeki.pdf
    • https://bovumemobet.weebly.com/uploads/1/3/0/5/130541064/acab182.pdf
    • http://boda-hilda-avelino.com/uploads/2020/01/28/e8e4f8b215.pdf
    • http://mghscounselor.weebly.com/uploads/1/3/0/6/130604836/zinuso_doledefevidowi_vumito_kusem.pdf
    • http://fresh21.ru/uploads/2020/01/27/pozisokopotut_kobiwedabeb.pdf
    • http://kogasubaju.prostotak.info/uploads/2020/01/27/9318778.pdf
    • http://tatianasy.com/uploads/1/3/0/3/130324315/7843558.pdf
    • http://vubesif.javaprog.online/uploads/2020/01/29/6934180.pdf
    • http://thedianavargas.com/uploads/1/3/0/5/130539319/7607367.pdf
    • http://wudir.app3pinfo.online/uploads/2020/01/29/b701449e0a0.pdf
    • http://riversforhealth.org/uploads/1/3/0/3/130313670/kukajof.pdf
    • http://sadityyou.com/uploads/1/3/0/6/130604541/3425792.pdf
    • https://kunazokeb.weebly.com/uploads/1/3/0/2/130274349/ranupanojobo.pdf
    • http://tcsonline.net/uploads/1/3/0/6/130640105/130640105.html#bossam+v6+mod+menu

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001650.bin
5ffa883cf2518e2aa1f3ebca88fd043fcea4f54a3022cc0f3d6c736589b7ee3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1650 8844 bytes

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