Malicious PDF — malware analysis report

Static analysis result for SHA-256 fef5fa780655f514…

MALICIOUS

PDF

12.4 KB Created: 2015-07-15 16:24:45 +04:00 Authoring application: DOMPDF
MD5: c99b777db866a3e221e7553756072ffa SHA-1: eb86ae87dba3250ded99b63b0899a23a3ff90731 SHA-256: fef5fa780655f514521f7a63a22a52e364b4954b264ff84bfed5553ad5588b86
90 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 User Execution: Malicious File

The PDF file was flagged by a machine learning classifier as malicious. Static analysis revealed a large number of embedded URLs, forming a link farm. The primary attack pattern appears to be SEO manipulation or directing users to potentially malicious content hosted on these numerous external domains. No scripts were extracted, and the document body contained mostly garbage data, making it difficult to ascertain a more specific user-facing lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8883

Heuristics 2

  • 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.
  • 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://chavagnes.com/index.php?article=2423.2&urwbo=2&pdf=2423
    • http://www.thewastebutlers.com/index.php?article=707.1&tkqal=1&pdf=707
    • http://marcogulf.com/index.php?article=1054.1&puzto=1&pdf=1054
    • http://chavagnes.com/index.php?article=2478.2&urwbo=2&pdf=2478
    • http://harmenhomes.ca/index.php?article=191.1&wcdhp=1&pdf=191
    • http://chavagnes.com/index.php?article=336.2&urwbo=2&pdf=336
    • http://domedesigner.com/index.php?article=1403.1&urgni=1&pdf=1403
    • http://razan.com.ua/index.php?article=2014.1&vafyr=1&pdf=2014
    • http://regionori.ru/index.php?article=725.1&lcnlt=1&pdf=725
    • http://chavagnes.com/index.php?article=2389.2&urwbo=2&pdf=2389
    • http://chavagnes.com/index.php?article=1000.2&urwbo=2&pdf=1000
    • http://chavagnes.com/index.php?article=1169.2&urwbo=2&pdf=1169
    • http://www.mantrabeautybar.ca/index.php?article=496.1&rukbv=1&pdf=496
    • http://chavagnes.com/index.php?article=2276.2&urwbo=2&pdf=2276
    • http://csurgoiszennyviztarsulas.hu/index.php?article=101.2&hvyoo=2&pdf=101
    • http://chavagnes.com/index.php?article=617.2&urwbo=2&pdf=617
    • http://www.robinprime.com/index.php?article=472.1&bedxv=1&pdf=472

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