Malicious PDF — malware analysis report

Static analysis result for SHA-256 bfe67b2e3a6fb428…

MALICIOUS

PDF

43.7 KB Authoring application: pstoedit
MD5: 97dbbb1c7757f490cf5182589f6afcda SHA-1: 1458da3266acad6b9f167d2b6ee250ff22b4e183 SHA-256: bfe67b2e3a6fb4288553afcb180ecf81837933e30aceaab40076d65852561a57
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF file contains a large number of embedded links to external PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This technique is often used for SEO manipulation or to distribute malicious content. The ML classifier and ClamAV detection strongly support the malicious nature of this file. No scripts were extracted from this sample, and the document body content is largely unreadable, making it difficult to determine the exact lure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://norcalsetac.net/uploads/1/3/0/4/130435862/263994.pdf
    • https://luzurizabeji.weebly.com/uploads/1/3/0/6/130604147/1194070.pdf
    • http://mirrorsireland.com/uploads/1/3/0/7/130775186/wajunato_pajezalu_viwaxodetuzug_wugezo.pdf
    • http://masalafusion.net/uploads/1/3/0/6/130639488/telakaxeduni.pdf
    • http://thepinstation.com/uploads/1/3/0/2/130287426/kesijamufavu_sotusubuf.pdf
    • http://fearlessvisionmarketing.org/uploads/1/3/0/6/130621407/nugepobaroj.pdf
    • http://specialdental.net/uploads/1/3/0/6/130604940/pumonet-ralufanasusu.pdf
    • http://relationshipsartcollection.com/uploads/1/3/0/6/130603861/dibowizumoto_vasew.pdf
    • http://vuwaru.gotechsolucoes.com/uploads/2020/01/28/3730090.pdf
    • http://verifiedoverviws.com/uploads/1/3/0/7/130739519/2392826.pdf
    • http://cesun2018.org/uploads/1/3/0/2/130274098/rutuji.pdf
    • http://anarogersfitness.com/uploads/1/3/0/3/130379087/7e8638ed90.pdf
    • http://bodyworkbybarb.com/uploads/1/3/0/5/130588451/130588451.html#blank+song+sheets+for+guitar

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000132b.bin
1b599a00ef69ca9d69fc5c0d428f2ddaf737c3395a80710b66f6a2ba1f63646c		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B 7988 bytes
font_01_sfnt_off00005fab.bin
e2f1373bf3d70a40ff4276a486f0a1d2d32154e4f45ad1243a44c3d3b7d91cea		 pdf-font-stream PDF embedded font (sfnt) at offset 0x5FAB 2652 bytes
font_02_sfnt_off00006829.bin
6ded4558f1f2ec084db5650ca7561b0d48f97bb1df6169125951713a7a8f2ed1		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6829 6648 bytes

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