Malicious PDF — malware analysis report

Static analysis result for SHA-256 72ba14b3cf851518…

MALICIOUS

PDF

44.7 KB Authoring application: QPDF
MD5: 4d17f896a132aa0f9417b966a8e195f2 SHA-1: 0c66c1576fce073f2142ec062b32962d0fffb28f SHA-256: 72ba14b3cf85151862ffc126de90fa96775250d1ead392d46fcebff95983ae2b
192 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file exhibits characteristics of a link farm or SEO spam, directing users to a large number of external PDF files hosted on various domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to malicious content, potentially leveraging embedded JavaScript for obfuscation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

Heuristics 4

  • 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
  • PDF link to algorithmically-generated URL high PDF_RANDOM_URL_LINK
    PDF contains a clickable HTTP(S) link whose host looks algorithmically generated (pronounceable-random labels) and whose path/query carries a long high-entropy token. This is the randomized-redirector pattern of malspam phishing lures — the visible document is only a prompt — not a PDF parser vulnerability.
  • 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 https://rosefudob.weebly.com/uploads/1/3/0/4/130483508/5d1a19f90f0987.pdf
    • http://propodcastcontrol.com/uploads/1/3/0/5/130550756/sesagogido_vawiwojedawoj_vekomomuvoper.pdf
    • http://taratomicevic.com/uploads/1/3/0/4/130436093/7687387.pdf
    • http://ujcdsgn.com/uploads/1/3/0/5/130551302/9723228.pdf
    • http://themarsacademy.weebly.com/uploads/1/3/0/5/130551890/resujoximi.pdf
    • http://montessoritoysandfurniturecambodia.com/uploads/1/3/0/6/130621382/wowabijafusosapam.pdf
    • http://actionlearning.nl/uploads/1/3/0/6/130620207/4536441.pdf
    • http://msfontes.com/uploads/1/3/0/6/130620467/nafox.pdf
    • http://jessicagaul.com/uploads/1/3/0/5/130551697/0571db.pdf
    • https://najutibewegusu.weebly.com/uploads/1/3/0/3/130379226/gixiwopojaf-detoxi.pdf
    • http://proceduralpixel.net/uploads/1/3/0/6/130621362/8897297.pdf
    • http://mrdbmitchell.com/uploads/1/3/0/6/130605482/bavuzo_rezefalulare_sezudojeruxe_vigan.pdf
    • http://sweetestdreams.org/uploads/1/3/0/4/130477176/130477176.html#word+order+of+adjectives+and+adverbs

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000132b.bin
4061dd5368d186224d882b04db6361bcde6f28bcbd506fb38b4e1be948f9bb4e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x132B 7992 bytes

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