Malicious PDF — malware analysis report

Static analysis result for SHA-256 5fb6c12be14e891c…

MALICIOUS

PDF

59.9 KB Authoring application: LibreOffice
MD5: ce9c2bcf9a60d60b66bf5f3150ad884c SHA-1: b843de97169a8d8e4dc1a9ceffe3c850962ce759 SHA-256: 5fb6c12be14e891c8c2e1a72473be7044721174cf91606b74f46eb605e2b6509
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains a mass external link farm, with 18 links pointing to other PDF files, disguised as an annual report. This heuristic, combined with ML classification and ClamAV detection, strongly suggests a phishing or malware distribution campaign. The embedded URLs are likely used to host or redirect to malicious payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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://buchanannutrition.com/uploads/1/3/0/6/130605267/1def6211c.pdf
    • https://teruwokuwe.weebly.com/uploads/1/3/0/6/130604518/3110098.pdf
    • http://cairnsclassictours.com/uploads/1/3/0/6/130604823/8881221.pdf
    • http://operationalysha.com/uploads/1/3/0/2/130291575/81434.pdf
    • http://utpgroupservices.com/uploads/1/3/0/5/130589006/d5103cf0dc514.pdf
    • http://metaradiant.org/uploads/1/3/0/5/130547884/c6eed013d927.pdf
    • http://jlcigars.com/uploads/1/3/0/2/130272369/luwojupu.pdf
    • http://aandeapothecary.com/uploads/1/3/0/2/130291713/mofumojalavidero.pdf
    • http://starcustomsgr.com/uploads/1/3/0/4/130435500/mudekujijiwo.pdf
    • http://reboundat.com/uploads/1/3/0/4/130483546/130483546.html#britannia+industries+ltd+annual+report+2018-+19

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000129b.bin
4aa3a029e4be0a302073f55468dbd1ab2109270b1a7a22b852c0af9f14ab9177		 pdf-font-stream PDF embedded font (sfnt) at offset 0x129B 9000 bytes

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