Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6fb00f9225f442…

MALICIOUS

PDF

64.0 KB Authoring application: Smallpdf Desktop
MD5: be7b762eeabd04e4a28ce280dcb1bf70 SHA-1: 5c6947ffec54cac8072da55fbbe4949ab0e5bd8f SHA-256: ca6fb00f9225f44271c12efacb032eaefb98d61be749667ed2e8968763d69c93
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external resources, indicative of a link farm or redirection scheme. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the 'PDF_SEO_LINK_FARM' heuristic strongly suggest this PDF is part of a phishing or malicious redirection campaign. The ML classifier also flagged it with high confidence.

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://tacticalvalkyrie.com/uploads/1/3/0/2/130289283/8012645.pdf
    • http://sozelom.medicine-times.ru/uploads/2020/01/28/9258977.pdf
    • http://schoolchoicevermont.com/uploads/1/3/0/6/130621581/zevot-wilup-xowirotezo-pezepeni.pdf
    • http://annasparklebox.com/uploads/1/3/0/6/130639331/gowobexekedadukaz.pdf
    • http://lifetunesonline.net/uploads/1/3/0/5/130547078/vubukabekidepi.pdf
    • http://niveditainstitutions.com/uploads/1/3/0/4/130483299/1969920.pdf
    • http://nefiw.tashermer.xyz/uploads/2020/01/28/nexadej.pdf
    • http://moschellaroberts.net/uploads/1/3/0/7/130776304/532470e370e.pdf
    • http://theten.online/uploads/1/3/0/5/130588676/346630633.pdf
    • http://plex.run/uploads/1/3/0/4/130435945/repakivan.pdf
    • http://asociacionperiodistaspr.org/uploads/1/3/0/2/130272484/130272484.html#pdf+anita+konyvei.+blogspot

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014d1.bin
4003737d4e75087c308ae2af786dd71f6fcbfdf2e2e83b15c6435f9bfa64dc30		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14D1 9756 bytes
font_01_sfnt_off0000b552.bin
779aa567746046747dac965df7fdfb06ff632674a0a99ce247a327bf89f0fa63		 pdf-font-stream PDF embedded font (sfnt) at offset 0xB552 16036 bytes

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