Malicious PDF — malware analysis report

Static analysis result for SHA-256 e84f70376e6fd49f…

MALICIOUS

PDF

47.6 KB Authoring application: PDFBox
MD5: e10749f83475dc7f746a1726fa0853fc SHA-1: 401e612059d572d6671c88f648eaf130a7cbc5f1 SHA-256: e84f70376e6fd49fa16779d6111bcab56cb84fd806854bd4e457b885ad34c27a
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1204.002 Malicious File

The PDF contains a large number of external links to other PDF files hosted on various domains, as indicated by the PDF_SEO_LINK_FARM heuristic. This pattern is commonly used for phishing or distributing further malware. The ClamAV detection and ML classifier also strongly indicate malicious intent. No scripts were extracted, but the embedded URLs are the primary indicators of compromise.

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://need4relief.com/uploads/1/3/0/6/130621206/6661947.pdf
    • http://jordansummers.net/uploads/1/3/0/6/130620578/gofowovifazuzifiliza.pdf
    • http://middlecreekelementaryschool.weebly.com/uploads/1/3/0/5/130539442/a78edb96.pdf
    • http://periscopedigital.com.au/uploads/1/3/0/6/130604598/91535.pdf
    • http://sugarmaplecharcoal.com/uploads/1/3/0/6/130639368/2f26ae004a926d5.pdf
    • http://gfx.directory/uploads/1/3/0/3/130323295/9420750.pdf
    • http://billelenbark.net/uploads/1/3/0/6/130620937/maruxaruv-vetotoximogebaj-xeramitujekus-jifuwaloper.pdf
    • http://44michigan.com/uploads/1/3/0/8/130873855/130873855.html#tomaso+albinoni+adagio+in+g+minor+download+free+mp3

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000012b9.bin
539718baa630eb341bd36684b1a0f5b69a0dc38f45b9e559b7ab23ad96bd3c19		 pdf-font-stream PDF embedded font (sfnt) at offset 0x12B9 11540 bytes

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