Malicious PDF — malware analysis report

Static analysis result for SHA-256 f685aac77059ca26…

MALICIOUS

PDF

46.1 KB Authoring application: Mobipocket Creator
MD5: 9bc29f79d58121cb5903aceae203373c SHA-1: 2b778536365068c82dcd32bd8c6e9467b4a1e415 SHA-256: f685aac77059ca2646e12abecbbd80a9b61b19933280238b98a59c615fb104e8
150 Risk Score

Malware Insights

MITRE ATT&CK
T1566.002 Spearphishing Attachment T1059.001 PowerShell

The PDF contains a large number of embedded links to external PDF files, a technique often used for SEO poisoning or to redirect users to malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. The embedded URLs are the primary indicators of compromise, likely serving as lures or redirects.

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 https://zivazajulin.weebly.com/uploads/1/3/0/2/130272336/nijopixixaset_legusukarelu_losobudanog.pdf
    • http://giftoffullness.com/uploads/1/3/0/6/130640013/foliwufu_zirirukawuw_vizolarelufit_kemijaxakip.pdf
    • http://srphotodesign.com/uploads/1/3/0/3/130324037/watetamaziloki.pdf
    • http://acutabovelawncare.org/uploads/1/3/0/3/130312985/6822155.pdf
    • http://mhsorchestra.org/uploads/1/3/0/6/130621369/b1dc306b028.pdf
    • http://mightyjunior.com/uploads/1/3/0/7/130739829/9842081.pdf
    • http://rachnayoga.com/uploads/1/3/0/5/130551671/busevetobotovonefobe.pdf
    • http://moemoneybeats.com/uploads/1/3/0/5/130588924/b7c1a77c374.pdf
    • http://blockchainambassador.ca/uploads/1/3/0/7/130738543/130738543.html#ap+si+mains+paper+4+2019+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001208.bin
c493e3d30a627cc95e15d84776d0c8932345f9ea1a83914d6e7dfbd7cb4069ee		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1208 8452 bytes
font_01_sfnt_off00006e4c.bin
ca889182d22413b1a5b6446cd5d954c095bfc2c8b2fec1022b19199100617195		 pdf-font-stream PDF embedded font (sfnt) at offset 0x6E4C 16028 bytes

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