Malicious PDF — malware analysis report

Static analysis result for SHA-256 f93be96e2f7b22db…

MALICIOUS

PDF

31.0 KB Authoring application: QPDF
MD5: 21ef2965c26da78f3590f9d8b2608d58 SHA-1: e783da40526c90f739f54ebd8c8228f2ba07399d SHA-256: f93be96e2f7b22dbcd65aaf03adf34fba493739e7aab196bace4beb9d24b02f4
152 Risk Score

Malware Insights

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

The PDF file contains a large number of embedded external links to other PDF files hosted on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content, as flagged by the PDF_SEO_LINK_FARM heuristic. The ClamAV detection and ML classifier further support its malicious nature. The document body itself is heavily obfuscated and contains fragments of URLs, reinforcing the link-based attack pattern.

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://gridforce.us/uploads/1/3/0/3/130312986/4417956.pdf
    • http://thefactorystudio.com/uploads/1/3/0/7/130775806/915679.pdf
    • http://bearvsbaby.net/uploads/1/3/0/6/130639334/puvurojemu-pawowopadi-zetezelozu-savepiwagixufo.pdf
    • http://asktheturk.com/uploads/1/3/0/2/130270799/d8b0ae2c0.pdf
    • http://cpanel.giveinfulltoday.org/uploads/1/3/0/7/130739952/zupisar.pdf
    • http://50klawn.net/uploads/1/3/0/6/130620781/semebanapi_betazo_zezelizozem_kivofesufug.pdf
    • http://ezstocker.com/uploads/1/3/0/5/130544447/5206589.pdf
    • http://nwm6.club/uploads/1/3/0/7/130775032/b60d257da7e2a41.pdf
    • http://create218.org/uploads/1/3/0/4/130483499/dcc39.pdf
    • http://fby4.com/uploads/1/3/0/7/130776889/9d060d4d5.pdf
    • http://btravels.co.za/uploads/1/3/0/6/130620752/05048fe328f6488.pdf
    • http://8ccer.bpmtc.com/uploads/1/3/0/6/130620912/130620912.html#quran+bangla+translation+mp3

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00002398.bin
79dca6af591e59cb033f8328b21b7472fb8dfd65f064bd0f456802adb2b58cb2		 pdf-font-stream PDF embedded font (sfnt) at offset 0x2398 7444 bytes

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