Malicious PDF — malware analysis report

Static analysis result for SHA-256 8b43c68cf39d7486…

MALICIOUS

PDF

36.6 KB Authoring application: QPDF
MD5: eb76c8d436977ddb13ff9060c59871ba SHA-1: b9d811d4114cf0a50867c24e5ca17c2b3ef4769c SHA-256: 8b43c68cf39d74863896cbcdcc71221af834e4a58df84adb866ae309d218d8cc
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.001 PowerShell

The PDF file contains a large number of embedded URLs pointing to other PDF files on various domains. This behavior is indicative of a link farm or a distribution mechanism for further malicious content. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution.

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://saskcorpservices.com/uploads/1/3/0/5/130588802/pezim.pdf
    • http://mtbsiteservicesbusiness.com/uploads/1/3/0/2/130289686/7265793.pdf
    • http://nakomaplumas.com/uploads/1/3/0/6/130639282/xexopafub.pdf
    • http://aquinasenglish.com/uploads/1/3/0/6/130603782/f93ca4e8.pdf
    • http://morningsunshinebath.com/uploads/1/3/0/6/130604466/gozevipomubejesefeji.pdf
    • http://zizu.pennystockpromotions.com/uploads/2020/01/29/demitadag_lidoz_sivinajajumil.pdf
    • http://elder-well.net/uploads/1/3/0/6/130639603/fa9951a.pdf
    • http://mrscooterrentals.net/uploads/1/3/0/4/130476120/e4fb7.pdf
    • http://southeastee.org/uploads/1/3/0/7/130775328/matezilodovifi.pdf
    • http://prceducation.net/uploads/1/3/0/6/130620690/madaxetoviritalojoka.pdf
    • http://woodlandstuition.com/uploads/1/3/0/2/130272086/130272086.html#adverbs+modifying+adjectives+and+verbs+exercises

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000129e.bin
d25dcfb58651cecd8292ff3f54413e1bec3d78cea90dc36a4833083a6510076f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129E 8096 bytes

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