Malicious PDF — malware analysis report

Static analysis result for SHA-256 17fbd95f94a91bd1…

MALICIOUS

PDF

58.1 KB Authoring application: Smallpdf Desktop
MD5: 4cd74efef561b4faec50d53add22cfff SHA-1: f2f603ce9972cf0e939397132db665ba4436ffbc SHA-256: 17fbd95f94a91bd15266def32308213274c9ee8ef3a819ab4ca3bb26cd78f29d
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document contains a large number of embedded URLs pointing to external PDF files, as indicated by the PDF_SEO_LINK_FARM heuristic. This suggests a phishing or SEO spam campaign designed to drive traffic to malicious or misleading content. The ML classifier and ClamAV detection further support the malicious nature of this file.

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://sowij.popov.space/uploads/2020/01/27/407983.pdf
    • http://watusi.impotenz-selbsthilfe.site/uploads/2020/01/29/224827.pdf
    • http://posabo.vetrics.ru/uploads/2020/01/28/6129616.pdf
    • http://ful.yootrade.ru/uploads/2020/01/27/sejowidejateta-gogagaf-gapiduw-begesit.pdf
    • http://liv4ever.com/uploads/1/3/0/5/130539341/vorewasobuba.pdf
    • http://anjaliseries.com/uploads/1/3/0/5/130542775/furodugenoge-tizojog-fopetob-pexavoj.pdf
    • http://funitu.saento.biz/uploads/2020/01/28/2603582.pdf
    • http://defense-elec-corp.com/uploads/1/3/0/6/130604585/tadaxumuki_kupepanip.pdf
    • http://moneygramvnvn.com/uploads/1/3/0/4/130477335/1959057.pdf
    • http://circuitocampoatravesdipgra.com/uploads/1/3/0/6/130604892/xoropolezugo_tikijozevufi.pdf
    • http://caseypatrickmurphy.com/uploads/1/3/0/6/130639393/130639393.html#aacsb+accredited+masters+accounting

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000134c.bin
70c96804eb3466b0106d47eb9faf074ac6bc62fcc9a65e49532f171a49a914a9		 pdf-font-stream PDF embedded font (sfnt) at offset 0x134C 8840 bytes

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