Malicious PDF — malware analysis report

Static analysis result for SHA-256 21b58596ee7e1adb…

MALICIOUS

PDF

27.3 KB Authoring application: LibreOffice
MD5: 9d661860094915f80328cff611aa0dad SHA-1: a15405ea79217b7f4f35b929ec2701e53683f5fb SHA-256: 21b58596ee7e1adbca1684dd021fc1cf1a95f25b37bf73e378ea6ab35f8cef57
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 URLs pointing to other PDF files, a technique commonly used for SEO poisoning and phishing. The ClamAV detection 'Pdf.Phishing.TtraffRobotInstall-7605656-0' and the critical heuristic 'PDF_SEO_LINK_FARM' strongly indicate a phishing or malicious redirection campaign. The document body, while containing garbled text, mentions 'Autocad electrical 2018 book pdf', likely a lure to entice users to click the malicious links.

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://nano-technique.com/uploads/1/3/0/5/130589115/ea576d9.pdf
    • http://mlkgrandjunction.com/uploads/1/3/0/5/130550911/zopuxorodigiseze.pdf
    • http://ncmodern.com/uploads/1/3/0/3/130313123/bovebikidube.pdf
    • http://tahoenaturecenter.com/uploads/1/3/0/6/130620529/jokipadinefikutigi.pdf
    • http://summitacademyma.com/uploads/1/3/0/5/130541424/saluk.pdf
    • http://supersailingyachts.com/uploads/1/3/0/3/130313363/bobejegoz.pdf
    • http://perthcards.com/uploads/1/3/0/5/130551179/8565313.pdf
    • http://catchnrelease.org/uploads/1/3/0/4/130488934/1938963.pdf
    • http://generationdog.org/uploads/1/3/0/7/130738710/pinitumawij_jabudebubos.pdf
    • http://mynaturalhairspa.com/uploads/1/3/0/6/130604430/lebawepikiso.pdf
    • http://qipaiyouxizenmezhuanqian.br3h.com/uploads/1/3/0/8/130874316/130874316.html#autocad+electrical+2018+book+pdf

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001703.bin
c24d969ea34511640b7c3b7c709721a80ae9f292a75e43aa322a13bf6b38daae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1703 6924 bytes

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