Malicious PDF — malware analysis report

Static analysis result for SHA-256 86397d0123dfdf11…

MALICIOUS

PDF

40.7 KB Authoring application: Nitro PDF First seen: 2020-09-24
MD5: d6d7b255e2fc7472fc53be8d80bff141 SHA-1: 1726e2e751b988265d0b02cdb0408de1403b0a4f SHA-256: 86397d0123dfdf118051296c1eb51465f393b6b2190be24b5ffca546610ca5af
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule and a ClamAV detection for phishing malware. The document contains a large number of embedded URLs, many of which follow a pattern of linking to PDF files on various domains. This suggests a campaign to distribute malicious content or phish users through a link farm, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 1.0000

Heuristics 3

  • ClamAV: Pdf.Phishing.TtraffRobotInstall-7605656-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.TtraffRobotInstall-7605656-0
  • 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.
  • 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://towercompaniesinc.com/uploads/1/3/0/5/130551130/50010a6.pdf In PDF document text
    • http://annalyzethat.com/uploads/1/3/0/3/130379475/2824251.pdfIn PDF document text
    • http://triosreadydentallab.com/uploads/1/3/0/3/130313049/29bf2bd3221.pdfIn PDF document text
    • http://missfitonline.com/uploads/1/3/0/4/130476317/bubivekof.pdfIn PDF document text
    • http://ngravinggifts.shop/uploads/1/3/0/6/130620849/bipobagonoxesij.pdfIn PDF document text
    • http://suite420marketing.com/uploads/1/3/0/5/130588251/jegumupe.pdfIn PDF document text
    • http://bethegamechanger.org/uploads/1/3/0/5/130588847/newiwebono-werupafa-remufopat.pdfIn PDF document text
    • http://clarkendaletravel.com/uploads/1/3/0/6/130604414/9beeaf8a.pdfIn PDF document text
    • http://morganvarn.com/uploads/1/3/0/5/130539763/susawig.pdfIn PDF document text
    • http://cfthomas.com/uploads/1/3/0/5/130589214/130589214.html#4th+industrial+revolution+commission+south+africaIn PDF document text

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000013f7.bin
24e0fbefdd5814a073b8ac62c726bdcea7a185084a9ba48960c576081cb8304d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x13F7 8284 bytes

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