Malicious PDF — malware analysis report

Static analysis result for SHA-256 05ac20af30f45926…

MALICIOUS

PDF

43.6 KB Authoring application: Nitro PDF
MD5: 13c9aaeb9227dd42feca666be9b6e1ec SHA-1: 99f861345cff1371299fa023ad17f8f7e8e841e7 SHA-256: 05ac20af30f459262059e45798f9837bf4d4f0b90dc0febebc6ec43c6807a003
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged by multiple heuristics, including ClamAV and an ML classifier, indicating malicious intent. The primary attack pattern observed is the PDF_SEO_LINK_FARM heuristic, which identified a large number of embedded external links pointing to other PDF files hosted on various domains. While no scripts were explicitly extracted, the presence of embedded URLs suggests a potential for further malicious activity or SEO spam. The document body contains garbled text and some URLs, reinforcing the link farm observation.

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://nationalcatholicchoir.org/uploads/1/3/0/5/130538817/ramojezevajamiw_bevudu.pdf
    • http://kedisavav.insnet.ru/uploads/2020/01/28/puvopevubove_rojazolazuwitet_gezimu.pdf
    • http://beeverfit.com/uploads/1/3/0/5/130550938/metupuli-lewifemom.pdf
    • http://makefow.tripmakanangin.com/uploads/2020/01/27/wegamebatunuwumu.pdf
    • https://dofujikofinaweb.weebly.com/uploads/1/3/0/3/130323412/9455809.pdf
    • http://nxmedia.weebly.com/uploads/1/3/0/6/130620478/gejufop.pdf
    • http://famo.vipiski-besplatno7.icu/uploads/2020/01/28/271a05bdc591.pdf
    • http://lightup-mag.tokyo/uploads/1/3/0/5/130547576/5cfc779e.pdf
    • http://knives.promo/uploads/2020/01/27/vuzofeb_xuvigorojiveko_dafosikovov.pdf
    • http://jobs-kuechenhandel.org/uploads/1/3/0/4/130488773/dadogaxalulivulatuga.pdf
    • http://stripperbud.com/uploads/1/3/0/4/130483158/ba725e7ae.pdf
    • http://phantom-rust.net/uploads/1/3/0/5/130543084/womonepagipebe_davogun.pdf
    • http://vip-fermer.ru/uploads/2020/01/27/4854896.pdf
    • http://windsorplaceepsom.com/uploads/1/3/0/6/130621053/reboxenijopij.pdf
    • http://jukidisamu.sultantec.com/uploads/2020/01/28/peluk.pdf
    • http://tof.stroy177.ru/uploads/2020/01/28/6277571.pdf
    • http://westsidemedical.org/uploads/1/3/0/6/130604067/kuzunutosizafot.pdf
    • http://zokari.internet-buhgalteriya.ru/uploads/2020/01/27/2c6f1d17d0fcde7.pdf
    • http://vijenaran.mactak.center/uploads/2020/01/27/zifadusobuduteb.pdf
    • http://punalito.wayaway.info/uploads/2020/01/29/180547ae8c1a.pdf
    • https://jixowexe.weebly.com/uploads/1/3/0/3/130379463/1c8e0cf4353.pdf
    • http://sif.tanfoto.ru/uploads/2020/01/27/8406750.pdf
    • http://meshayla.com/uploads/1/3/0/4/130435821/130435821.html#halka+halka+aishwarya+video+song
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000016d2.bin
5108d9ad76051a5a93aced2fd2fc5fe63a1ea9b6246b20953b2d66ec065f8e70
pdf-font-stream PDF embedded font (sfnt) at offset 0x16D2 8488 bytes
font_01_sfnt_off00006271.bin
4b01d997eddfd6ec4066ac76a2f2dcbcbc3384162804b1130a19333605e5c975
pdf-font-stream PDF embedded font (sfnt) at offset 0x6271 16212 bytes