Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ef41e9ce199741a…

MALICIOUS

PDF

85.9 KB Created: 2020-04-01 23:31:08 +03:00 Authoring application: wkhtmltopdf 0.12.1.4 (via Qt 4.8.6)
MD5: d6d324a4046a87436ae6c6bb01ab2391 SHA-1: a3e108bc5b719f877e06108df8859738f83994fb SHA-256: 4ef41e9ce199741a697f22ebd9cc30c0ac6aab0f6f74dca8ad34e4cbb0b2ffd7
154 Risk Score

Malware Insights

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

This PDF file was flagged by multiple heuristics as malicious, including a PDF link farm and a machine learning classifier. The embedded URLs and the document body suggest a lure to a website that may host further malicious content. The ClamAV detection of 'Pdf.Dropper.Agent-8815700-0' indicates it functions as a dropper for other malware.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 5

  • 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.Dropper.Agent-8815700-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-8815700-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://ontime247.net/uploads/1/3/0/6/130639780/130639780.html#nom+072+ssa1+2012+etiquetado+de+medicamentos
    • http://marchettetravel.com/uploads/1/3/0/7/130738799/jikutapafama-kukumoset.pdf
    • http://tausigmagmu.org/uploads/1/3/0/5/130539084/potarofalib.pdf
    • http://mail.hssmog.com/uploads/1/3/0/6/130621162/kobiluzapuxef-rifefaliminoka-nomifoto-kajemov.pdf
    • http://autodiscover.momosyarn.com/uploads/1/3/0/9/130969923/7e02639.pdf
    • http://ukustax.net/uploads/1/3/0/8/130874192/lijuwukovataw_wanorem.pdf
    • http://buddhabuns.com/uploads/1/3/0/7/130776564/650491.pdf
    • http://beautyonthegobyjessica.com/uploads/1/3/0/7/130739313/leverovewuvujebowile.pdf
    • http://antivenus.com/uploads/1/3/0/3/130313157/wozotodukiduvesom.pdf
    • http://futuregenerationhomebuyers.com/uploads/1/3/0/3/130323229/1da717cfa037a04.pdf
    • http://goldhoundprospecting.com/uploads/1/3/1/4/131437949/lipuziz-gasajubopupu-wuwopapasubukew.pdf
    • http://ketobakinggoddess.com/uploads/1/3/0/5/130551857/bibuxitubu_tamizug_lupifuxebiwakib_saludizenorab.pdf
    • http://littlerocktaxiservice.com/uploads/1/3/0/8/130813547/fowotikojudozij_gilokivasix_fibube.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012740.bin
7ca2f3913d40bbc6fc000f74fc44a3cb935fd57bc4bb4f8ba13cb754cd9dde8a		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12740 9688 bytes

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