Malicious PDF — malware analysis report

Static analysis result for SHA-256 523ae0d425e4f414…

MALICIOUS

PDF

36.3 KB Authoring application: PDF Studio
MD5: e12c95e22b5640c9be52eaea1de5de0c SHA-1: 0dfe70331aea0decdbce4238fdd141e67ecc5e6b SHA-256: 523ae0d425e4f41440d5a3c1deea157ce22f929c7f0b55ad777c37e100abcbf5
152 Risk Score

Malware Insights

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

The PDF contains a large number of embedded URLs pointing to external PDF files hosted on various free web hosting services. This technique is commonly used for SEO spam or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution via these linked PDFs.

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://clunycastle.weebly.com/uploads/1/3/0/6/130620826/fibabi.pdf
    • http://cinn-fullydelicious.com/uploads/1/3/0/4/130490078/dijikuvuzukoz-taver-rimatiw-sivogagagaxiga.pdf
    • http://nothingtotriflewith.com/uploads/1/3/0/6/130621642/zokami-rewisisuwisa.pdf
    • http://downsmassage.com/uploads/1/3/0/6/130640232/ruxog.pdf
    • http://zamuva.member-neteller.mobi/uploads/2020/01/28/fopal.pdf
    • http://bagsofun.co.uk/uploads/1/3/0/6/130621284/furuninopoguneku.pdf
    • http://rentalspacificgrove.com/uploads/1/3/0/6/130621794/5105275.pdf
    • http://clamagorereef.com/uploads/1/3/0/5/130588942/mijasujagid-nezuxesu.pdf
    • http://missionroadsdachurch.com/uploads/1/3/0/4/130436014/jitasarobilon.pdf
    • http://nugriot.com/uploads/1/3/0/6/130621755/lozeposivifi_xigowibu_gesezujisodus_mikiwuza.pdf
    • http://bewateryogaandcoaching.com/uploads/1/3/0/5/130540021/vituduvuw-pagositigekoke-woxakafimime-nepasa.pdf
    • http://samobuza.firstcommonsense.com/uploads/2020/01/29/1d2284142.pdf
    • http://adoptme.info/uploads/1/3/0/3/130313027/130313027.html#joy+to+the+world+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001328.bin
752158945a98ba07513cb8337abf133bd5c031e586043aec492151b76bcee938		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1328 7240 bytes
font_01_sfnt_off000045d3.bin
755bbc8b7a18107f70ebf2c89c643906d2948a914abb20777246feb40b3d96fb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x45D3 9932 bytes

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