Malicious PDF — malware analysis report

Static analysis result for SHA-256 bf55bb431d630d91…

MALICIOUS

PDF

34.3 KB Authoring application: pdf-parser
MD5: b3dfd63f188910f73f3e01ba5bf3ef36 SHA-1: ed830bded0c65801ada167fb81cc5ccc550078d0 SHA-256: bf55bb431d630d913b163a59ac85ce2273c4db83f438ae729285434a200a4e7e
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, many of which point to other PDF files, indicating a link farm for SEO manipulation. The ClamAV detection and ML classifier strongly suggest malicious intent, specifically identified as phishing and traffic redirection. The embedded URLs are likely used to distribute further malicious content or redirect users to phishing sites.

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://18thcenturyrestoration.com/uploads/1/3/0/5/130544878/993737.pdf
    • http://vipiski-online47.icu/uploads/2020/01/29/4a24cd2.pdf
    • http://zudi.rostelekomrtk.info/uploads/2020/01/27/dakasigo_mudarevem_wimolubave_vulafewuba.pdf
    • http://jeve.qq10qq.top/uploads/2020/01/27/6417104.pdf
    • http://enricabresciaphotography.com/uploads/1/3/0/3/130313463/bd114124d31b.pdf
    • http://nazojiw.tandifac.tech/uploads/2020/01/29/ruxotepaviged.pdf
    • http://sweetestdreams.org/uploads/1/3/0/6/130604859/vabot.pdf
    • http://luketheplumber.com/uploads/1/3/0/2/130289246/3126298.pdf
    • http://benomu.101doggy.com/uploads/2020/01/28/sifajuvusoxixitu.pdf
    • http://copyrightcontact-1000041832095.com/uploads/2020/01/28/3255514.pdf
    • http://ale-sajgon.com/uploads/2020/01/28/xovefopisofimononew.pdf
    • http://595corporateparkofcommerce.com/uploads/1/3/0/3/130323600/130323600.html#csi+2130+machinery+health+analyzer+user+manual

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012a1.bin
1596c7f56b88ec5ba0557a49ff2eeb2984f6749ab1c705861896ed29af09a809		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12A1 7280 bytes

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