Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbf45a374ac8f992…

MALICIOUS

PDF

37.8 KB Authoring application: LibreOffice
MD5: 178027dd90277ebac20e926ca6e2ad77 SHA-1: b37495887ec16b99b64d15f1ff0227c4bda2f4da SHA-256: dbf45a374ac8f99297fd9d594dc7962fa158701fd605bbf64fc9a3c37c3f348d
150 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.TtraffRobotInstall-7605656-0 and a machine learning classifier. Static analysis revealed a large number of embedded external links, indicating a link farm designed to redirect users to potentially malicious content. The primary heuristic firing, PDF_SEO_LINK_FARM, directly supports this finding, identifying 31 external PDF links, with tofubox.shop being the dominant host.

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://tofubox.shop/uploads/1/3/0/5/130544090/9581511.pdf
    • http://tidutizis.onkologicheskaya-patalogiya-i-eco.ru/uploads/2020/01/28/warosamizavumal.pdf
    • http://lirumivova.audiostart50.icu/uploads/2020/01/28/vurewik_perorigakidi.pdf
    • http://azzurraweb.net/uploads/1/3/0/2/130272440/dddecdb36.pdf
    • http://nextgentheatreco.com/uploads/1/3/0/4/130475923/zibuxuzugezo.pdf
    • http://atlfoodista.com/uploads/1/3/0/4/130488251/lefabuxopuxema-jetox-bowib-digil.pdf
    • https://tuguguxujo.weebly.com/uploads/1/3/0/2/130289585/jubiwelun_kexatafil.pdf
    • http://setonsandsholidayhomes.com/uploads/1/3/0/2/130274319/nitol.pdf
    • http://kipevasiv.ideifoto.ru/uploads/2020/01/27/palofiwaxebujupu.pdf
    • http://drpj.weebly.com/uploads/1/3/0/4/130476821/komenanolekoti.pdf
    • http://worlddoll.ru/uploads/2020/01/27/15563b4534e.pdf
    • http://jenuki.rbc-crypto.ru/uploads/2020/01/28/jowetexebafefa_wewuzo_jukaju.pdf
    • http://roka.flowers-sale.ru/uploads/2020/01/28/1659305.pdf
    • http://statementzine.com/uploads/1/3/0/6/130605254/tekepub_kazigamibe_sedilimemaze_xukevuvoki.pdf
    • http://mchusky.com/uploads/1/3/0/6/130604248/2959453.pdf
    • https://kamaxinefu.weebly.com/uploads/1/3/0/5/130538875/kenamefa.pdf
    • http://nobuhotelmarbella.devsite-1.com/uploads/1/3/0/6/130603818/130603818.html#limitless+html+template

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014b7.bin
b2ff3198915325eecdd3d1a78eba28c0a3cce407a63c5be0fb994e55b180a380		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14B7 8320 bytes

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