Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3f8fe3e2efc7e0…

MALICIOUS

PDF

44.2 KB Authoring application: Pdftk
MD5: 24f0a139037f5d8213c900c490dbf589 SHA-1: 984af3e5613da2559159ddc5ca6f11099f285e41 SHA-256: 4b3f8fe3e2efc7e01fd39ef8a4f46f5d7b8c902ed54a652a57f71da071278621
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links, a technique commonly used for SEO spam or to distribute malicious payloads. The ClamAV detection and ML classifier strongly indicate maliciousness. The embedded URLs are the primary indicators of compromise, suggesting a distribution or redirection mechanism.

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://2018skymath.weebly.com/uploads/1/3/0/5/130588729/5407988.pdf
    • http://tzaddi.net/uploads/1/3/0/6/130621998/sunewimub.pdf
    • http://barbersplus.com/uploads/1/3/0/4/130483354/nujazoxagil.pdf
    • http://clanbrown.ca/uploads/1/3/0/4/130476098/kekogulukud.pdf
    • http://sowij.popov.space/uploads/2020/01/28/gufaxedi.pdf
    • https://dezafuxu.weebly.com/uploads/1/3/0/2/130288399/8039470.pdf
    • http://dunu.lightprod.fun/uploads/2020/01/28/popelodagoragu_zivason.pdf
    • http://dbbcso.org/uploads/1/3/0/6/130639755/7599162.pdf
    • http://physicalculturebooks.weebly.com/uploads/1/3/0/3/130313415/gopikuziduwofem.pdf
    • http://route66caps.com/uploads/1/3/0/5/130589214/bejerakeg.pdf
    • http://koncgroup.com/uploads/1/3/0/3/130313262/5217749.pdf
    • http://dev.moabgear.com/uploads/1/3/0/5/130539718/japirofikavofipomik.pdf
    • http://mitgliederbereich.bauberater-kdr.de/uploads/1/3/0/6/130621798/bibawiludipabuwobote.pdf
    • http://newyorktravelmedicine.com/uploads/1/3/0/5/130540554/refolevak.pdf
    • http://westsydneyparanormal.org/uploads/1/3/0/2/130271137/zukonaloxetezanu.pdf
    • http://myaccount-solution.net/uploads/2020/01/28/gixapamuwupu.pdf
    • http://newperspectivemedical.com/uploads/1/3/0/3/130379292/130379292.html#dynell+biografia+wikipedia

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000014cb.bin
821ccb64dfb12dfec48d78d6e35bda6a0b9893f0571a7c206b02fe98c0120a85		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14CB 9100 bytes
font_01_sfnt_off00006d7d.bin
16374c43fefb3fb406266acbe16aee7d7122405634c1b68ba02c6c95ae4378ce		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6D7D 4196 bytes

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