Malicious PDF — malware analysis report

Static analysis result for SHA-256 88736c4e9cd196b4…

MALICIOUS

PDF

40.2 KB Authoring application: Smallpdf Desktop
MD5: d341a5435dbe004c81181683ebd17ced SHA-1: 88264a6e1061b32f325c7c8ae2b2e1a7d768f31e SHA-256: 88736c4e9cd196b4986743a709ad1f548ed693653a7d293d7b8ce0d9edf36fd3
150 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique often used for SEO manipulation or to distribute malware. ClamAV identified this as 'Pdf.Phishing.TtraffRobotInstall-7605656-0', and the ML classifier strongly agrees with maliciousness. The document body contains garbled text, suggesting it's not intended for human consumption but rather to facilitate the link farm.

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://nexus.ph/uploads/1/3/0/5/130590741/pexipar.pdf
    • http://campkinky.com/uploads/1/3/0/4/130489363/vufavaso-xajipoxisanewar-gokuwebivusadir.pdf
    • http://mimibug.com/uploads/1/3/0/5/130539072/72a8b3b99c2.pdf
    • http://svdptc.org/uploads/1/3/0/3/130313619/87920b94c4e1.pdf
    • http://merlene.ca/uploads/1/3/0/5/130543980/pawubufubarewi_wudigizuvo_sipurarobi.pdf
    • http://andamiaoficial.com/uploads/1/3/0/4/130483940/6953351.pdf
    • http://sanibelcondovacations.com/uploads/1/3/0/3/130379065/zalebexawupozir.pdf
    • http://triosdigital.com/uploads/1/3/0/2/130287988/fozam.pdf
    • http://mosimannlab.com/uploads/1/3/0/4/130488123/5821688.pdf
    • http://orangefishmedia.com/uploads/1/3/0/5/130551941/bunusog.pdf
    • http://mrscooterrentals.net/uploads/1/3/0/5/130551517/e47e3b9d27.pdf
    • http://brandexa.net/uploads/1/3/0/4/130435843/walozogurani.pdf
    • http://positivecp3.net/uploads/1/3/0/2/130287307/sesopowosanes-godipe-poxagawogakas.pdf
    • http://comfortablechristianity.com/uploads/1/3/0/4/130490301/fulixowekalolaxegig.pdf
    • http://nesyb.net/uploads/1/3/0/7/130775856/zabisubig.pdf
    • http://airbreather.net/uploads/1/3/0/4/130436080/tikabubuja-bulazadefunal.pdf
    • http://clearwash.fr/uploads/1/3/0/6/130604737/1324744.pdf
    • http://babydollscakes.com/uploads/1/3/0/7/130776676/5250219.pdf
    • http://cforcinema.org/uploads/1/3/0/3/130379266/giluwapo_tadajit_ralaraxoduzimo.pdf
    • http://cemento-stampato.org/uploads/1/3/0/6/130621404/260d58.pdf
    • http://myentouragemusic.com/uploads/1/3/0/3/130313193/130313193.html#chlamydia+pneumoniae+et+chlamydia+trachomatis
    • http://sanibelcondovacations.com/u

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003f0f.bin
a1a4b16ade1fdffa329112e2cc73631fe631b82e9ff08a86e9489d0c0a5b1ecb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3F0F 7464 bytes

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