Malicious PDF — malware analysis report

Static analysis result for SHA-256 1c74bb0d9d814608…

MALICIOUS

PDF

46.6 KB Authoring application: Smallpdf Desktop
MD5: d447553a150b4ac18904b0db42b0c6f6 SHA-1: f0f423659ecf20ab4df19906ef7289e74fec8ea5 SHA-256: 1c74bb0d9d814608ea29c2122f5c374ed50f1b7c6bd632c8523789f0d3365e53
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. The primary attack pattern observed is a 'link farm' containing 31 external PDF links, predominantly hosted on Weebly and other dynamic DNS services. These links likely serve to distribute additional malware or engage in SEO manipulation. The embedded URLs suggest a phishing or content distribution campaign.

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 https://bofutazi.weebly.com/uploads/1/3/0/5/130545800/a65c3246f948e.pdf
    • http://suxuku.mirpruzhin.com/uploads/2020/01/27/d64524ccfb.pdf
    • http://purepe.tikko.ru/uploads/2020/01/28/dd0b8941f29.pdf
    • https://wuzezanolu.weebly.com/uploads/1/3/0/4/130476700/satixokowidodir-ragim-nadajofes-vinuzeta.pdf
    • https://dexuvowuk.weebly.com/uploads/1/3/0/2/130270867/nakubezazumaduz.pdf
    • https://jufipuzumuxef.weebly.com/uploads/1/3/0/2/130289767/1274821.pdf
    • http://bogopo.supervasya.ru/uploads/2020/01/27/mitanawonog.pdf
    • http://fojino.game-server-and-client-configuration-in-sync.ru/uploads/2020/01/27/6051184.pdf
    • http://dufe.richardwm.online/uploads/2020/01/27/3ee94475d42.pdf
    • http://kedajuzip.baby-shar.ru/uploads/2020/01/28/tepewinugezokixe.pdf
    • http://jizevi.dveri-goodwin43.ru/uploads/2020/01/28/6c8872f7af8e9cc.pdf
    • http://danilorojasmendez.tech/uploads/2020/01/27/6194868.pdf
    • http://vag.sayt-nedorogo.ru/uploads/2020/01/27/7b668.pdf
    • http://lurupu.tseh.su/uploads/2020/01/28/8729427.pdf
    • https://duposiwebozoj.weebly.com/uploads/1/3/0/4/130435600/pidufezanawer-dababisodobito.pdf
    • http://bazo.kek.su/uploads/2020/01/28/bamexar.pdf
    • https://wedifegafanose.weebly.com/uploads/1/3/0/4/130483275/5a0bff526.pdf
    • http://depameb.tiu.fun/uploads/2020/01/28/5d071e06c21001.pdf
    • http://xex.ngochastore.com/uploads/2020/01/28/fadareki-xinisopodarep-rimezumulaw.pdf
    • http://modo.sportcarmoney.pw/uploads/2020/01/28/wikivolab_mumikigag_gudoludopuvid.pdf
    • https://morarafaf.weebly.com/uploads/1/3/0/5/130590224/130590224.html#fourth+industrial+revolution+accounting

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001678.bin
d27a587b1fafbcdc7fed1530cd42d5f4eacc4a7afc276052b18a6321494fee05		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1678 8596 bytes

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