Malicious PDF — malware analysis report

Static analysis result for SHA-256 6dee0d174443d71e…

MALICIOUS

PDF

11.3 KB Created: 2015-07-15 14:39:36 +04:00 Authoring application: DOMPDF
MD5: 2c2c66b64b81dfa4a8b3e75574d89f90 SHA-1: deaeacb6f3c5682ce58a4398a09e6548825965b3 SHA-256: 6dee0d174443d71e271585921d22f20b62260b3e2744b78ae66275d315f16917
92 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of embedded URLs, many pointing to domains that appear to be part of a link farm. The presence of JavaScript within the PDF stream, combined with the ML classifier flagging it as malicious, suggests it is designed to redirect users to potentially harmful content. The primary goal appears to be SEO spam or facilitating phishing through these numerous links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9048

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://photo-file.ru/index.php?article=551.1&wehsa=1&pdf=551
    • http://pathica.net/index.php?article=706.1&ikbca=1&pdf=706
    • http://wilsonswharf.com/index.php?article=850.7&lcckn=7&pdf=850
    • http://photo-file.ru/index.php?article=2052.1&wehsa=1&pdf=2052
    • http://heathervincentlandscapes.com.au/index.php?article=2039.1&bsylx=1&pdf=2039
    • http://photo-file.ru/index.php?article=9.1&wehsa=1&pdf=9
    • http://www.protop.co.il/index.php?article=1107.1&nraga=1&pdf=1107
    • http://cocoonin.fr/index.php?article=317.1&ybtii=1&pdf=317
    • http://www.mantrabeautybar.ca/index.php?article=2284.1&rukbv=1&pdf=2284
    • http://photo-file.ru/index.php?article=436.1&wehsa=1&pdf=436
    • http://photo-file.ru/index.php?article=563.1&wehsa=1&pdf=563
    • http://photo-file.ru/index.php?article=1018.1&wehsa=1&pdf=1018
    • http://immofina-solutions.com/index.php?article=1187.1&gzogv=1&pdf=1187
    • http://photo-file.ru/index.php?article=1238.1&wehsa=1&pdf=1238
    • http://karolek.com.pl/index.php?article=1585.1&fwvio=1&pdf=1585
    • http://photo-file.ru/index.php?article=1022.1&wehsa=1&pdf=1022
    • http://healthcare2-concepts.com/index.php?article=422.1&syyyl=1&pdf=422

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_000_off00000303.js
5372eff67c3baf8c4d920e4d88d0b6bc6f5cb7f7bcdb75c29a40f3ce65039429		 decompressed-pdf-stream PDF FlateDecoded stream at offset 0x303 13160 bytes

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