Malicious PDF — malware analysis report

Static analysis result for SHA-256 81ad34733e6666b3…

MALICIOUS

PDF

44.3 KB Authoring application: LibreOffice
MD5: 9d945934abfac53e6a73ddb1090de71f SHA-1: 21b862aa5d7bd6d13d8d220196c74237f420e401 SHA-256: 81ad34733e6666b3b823a2bdfa4a8a25e4ceb746b15864aabfc0ce235ee9a2a7
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. No scripts were extracted from this sample, limiting the analysis of direct execution behavior.

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://tuvanduhocanh.com/uploads/1/3/0/8/130813553/tuxubi.pdf
    • http://wag-works.com/uploads/1/3/0/4/130483583/a5ce31.pdf
    • http://caitlindoula.com/uploads/1/3/0/5/130588964/1684885.pdf
    • http://designwebframe.com/uploads/1/3/0/6/130620563/5018361.pdf
    • http://more-beautiful.com/uploads/1/3/0/7/130739020/8871970.pdf
    • http://woodruffshomeimprovements.net/uploads/1/3/0/5/130540017/puvojudedu.pdf
    • http://cubalibrecasino.com/uploads/1/3/0/5/130550857/8192049.pdf
    • http://drjamesworling.net/uploads/1/3/0/6/130605194/683692.pdf
    • http://luxury-travel-shop.com/uploads/1/3/0/8/130874386/7854a9.pdf
    • http://lianefong.com/uploads/1/3/0/6/130621025/2ea789f.pdf
    • http://www.advancespinerehab.com/uploads/1/3/0/4/130483045/8715820.pdf
    • http://dovernewlife.org/uploads/1/3/0/7/130776218/zurusazak.pdf
    • http://appwirestudios.com/uploads/1/3/0/6/130621800/xoxixen.pdf
    • http://webdisk.suisekirocks.com/uploads/1/3/0/8/130873848/xeloz.pdf
    • http://bayareabackdoc.com/uploads/1/3/0/3/130323900/7639950.pdf
    • http://lifeisdata.net/uploads/1/3/0/6/130603956/5518403.pdf
    • http://www.stocktontljsoccer.com/uploads/1/3/0/2/130289653/9906834.pdf
    • http://facultynewyork.com/uploads/1/3/0/6/130620981/viruzudisa.pdf
    • http://safecitysecurity.com/uploads/1/3/0/3/130323311/mawivitekobozewuwel.pdf
    • http://arlingtoncarpetcleaner.com/uploads/1/3/0/6/130621031/bowoxomuzax.pdf
    • http://mail.schoolofrespect.com/uploads/1/3/0/2/130272280/518522c8b68.pdf
    • http://walterwanderley.com/uploads/1/3/0/4/130476513/9137024.pdf
    • http://a6d.com/uploads/1/3/0/3/130323727/2f0c95b86342db.pdf
    • http://mail.redcientificaescolar.com/uploads/1/3/0/6/130620979/wirafe-vaweg.pdf
    • http://noahcompportfolio.com/uploads/1/3/0/6/130639889/7594b4cc021ae.pdf
    • http://churchstrettontaxi.com/uploads/1/3/0/5/130544257/130544257.html#algal+microbial+fuel+cell

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000480b.bin
e61bd683adec1fbc251e333adfbda8b51d55850d0794589a9f1faf67d6581f7b		 pdf-font-stream PDF embedded font (sfnt) at offset 0x480B 8644 bytes

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