Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffd09ec95034e58…

MALICIOUS

PDF

37.3 KB Authoring application: Mobipocket Creator
MD5: a8d7a91e3c85ded9ba970750371fd51e SHA-1: 74b83283ac37c9a4e8fd660ed7b96c53e20bbfdf SHA-256: 7ffd09ec95034e581bc060ea68a9a978c0a9963472dca1df4177dadfbdd2b3fb
150 Risk Score

Malware Insights

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

The PDF file contains a large number of external links to other PDF documents hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This behavior is characteristic of a link farm used to distribute malicious content or redirect users to phishing sites. The ML classifier and ClamAV detection further support the malicious nature of the file. No scripts were extracted from this sample.

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://adentabenelux.com/uploads/1/3/0/4/130488699/fakomavaxen_vebukirogutusaz_mupavixubo_xesezofe.pdf
    • http://cadescovejunkies.com/uploads/1/3/0/4/130435596/folegifaxiru.pdf
    • http://bestofthewestmoving.com/uploads/1/3/0/2/130291971/kulugox_kipune_xetagexep_jizupa.pdf
    • http://tarikat.ru/uploads/2020/01/29/sifenajejukaluvujo.pdf
    • http://mozellemosaics.com/uploads/1/3/0/5/130547771/2249041.pdf
    • http://leacentre.com/uploads/1/3/0/7/130776254/todok-wumemawo.pdf
    • http://collabsys.com/uploads/1/3/0/7/130739831/legizanegaxo.pdf
    • http://policetrailer.com/uploads/1/3/0/5/130589219/130589219.html#clinical+features+of+amoebic+liver+abscess

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000136a.bin
f56f23f5f15cc9475ab7e5f399b7dfe0dfcf14169023fa76a81e6ec3ab149baa		 pdf-font-stream PDF embedded font (sfnt) at offset 0x136A 8464 bytes

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