Malicious PDF — malware analysis report

Static analysis result for SHA-256 805f3b67bbaa830d…

MALICIOUS

PDF

33.2 KB Authoring application: QPDF
MD5: 1f56ff9bcb454aee1671257ce3c01778 SHA-1: 5ad555fe105763a1b70f8ab94b1558fcb8102df1 SHA-256: 805f3b67bbaa830de220e854c6a7a20c95493583567e3516f4020632207b5817
152 Risk Score

Malware Insights

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

The PDF contains a link farm of external PDF files, disguised as a TOEIC practice test. The embedded URLs are likely used to redirect users to malicious content or download further malware. ClamAV detection as 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the ML classifier output further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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://mfengshui.com/uploads/1/3/0/6/130604687/finozujukobire_lobejapareget_dumorasanizuwu_koxuxasom.pdf
    • http://mejabimu.tarikat.ru/uploads/2020/01/28/2746164.pdf
    • http://saintaidansfestival.co.uk/uploads/1/3/0/8/130815726/3498030.pdf
    • http://lat.onlineedu.ru/uploads/2020/01/28/4441246.pdf
    • http://moldeminas.com/uploads/1/3/0/4/130483478/wofape_kilebakelorib_watejatipujo_mogores.pdf
    • http://mpholistichealth.com/uploads/1/3/0/5/130550951/titokorebukuwi_kamupif.pdf
    • http://clutteredgypsie.com/uploads/1/3/0/7/130739385/130739385.html#toeic+practice+reading+test

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001109.bin
fddd9ba306def541964d64cbf51aecae488015235c9431a28f2681620a26ab3c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1109 8040 bytes

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