Malicious PDF — malware analysis report

Static analysis result for SHA-256 e9992cfc93a68706…

MALICIOUS

PDF

51.2 KB Authoring application: Poppler-utils
MD5: 1a8a63b3f944e064eed9699e752e709f SHA-1: 445708ed5fa2318dc62ad63e120ddd691e269ad4 SHA-256: e9992cfc93a68706352c62c572f556f8642bcd50ea9273c9e15743c608101b06
150 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded URLs pointing to external PDF files. This technique, identified by the PDF_SEO_LINK_FARM heuristic, is commonly used to redirect users to malicious sites or to host phishing content. The ML classifier and ClamAV detection further support its malicious nature. No scripts were extracted, but the extensive link farm indicates a likely phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

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://trollsock.com/uploads/1/3/0/4/130435892/baxip.pdf
    • http://kramerlawfirm.net/uploads/1/3/0/4/130476712/wazabem.pdf
    • http://wide.mkubcm.ru/uploads/2020/01/29/mudetusedimofo-xawular-podut.pdf
    • http://mobileopsdetailing.com/uploads/1/3/0/4/130483122/xanupexomof.pdf
    • http://gadojituj.tapuzik.com/uploads/2020/01/28/4384492.pdf
    • http://edgygent.com/uploads/1/3/0/4/130488396/galudepimafukazu.pdf
    • http://oakridgestables.co.uk/uploads/1/3/0/5/130541346/52d6b3dc22a5d.pdf
    • http://silentxc.com/uploads/1/3/0/6/130604860/dukitaninegimu.pdf
    • http://job.sell-video.ru/uploads/2020/01/29/82dfd756d3b72a5.pdf
    • http://desatascosbarcelona.org/uploads/1/3/0/5/130588159/wibunup.pdf
    • http://chewoncakes.com/uploads/1/3/0/4/130476294/130476294.html#horse+anatomy+for+artists

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012b3.bin
89a334ed8ebb28650e686236cf5b79a91068093af57d62477a13da424789532c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B3 9304 bytes
font_01_sfnt_off00008040.bin
3eb4b2cea5944beed14372be996492f8da05ecb2c2a1d392e04caf7671f8bd8d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x8040 10720 bytes

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