Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd1d4e7e9b437dfc…

MALICIOUS

PDF

36.3 KB Authoring application: LibreOffice Draw
MD5: e4127dbcd61a861ba942d1f3c65d20e4 SHA-1: e4d321ac4f60541779f0f8daecf80d5caa91a0ca SHA-256: fd1d4e7e9b437dfcdcbd1b4b74d6cdb21baa441e1f8a14f54938e55bd8382680
152 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The PDF contains a large number of embedded URLs pointing to external PDF files, a technique commonly used for SEO spam or phishing. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted from this sample, but the sheer volume of linked external content suggests a coordinated effort to drive traffic or distribute further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://kallenkentner.com/uploads/1/3/0/6/130640015/gasufomemuta_xanamol_vibomewus_xojekaduto.pdf
    • http://tractortrailerrepairrichmond.com/uploads/1/3/0/6/130620757/wazufu_ruwuzevixelud_miduredokolew_lebetotowerima.pdf
    • http://www.laclocheardennaise.fr/uploads/1/3/0/3/130313208/2842491.pdf
    • http://newarkvalley.org/uploads/1/3/0/4/130478057/9348190.pdf
    • http://capehomerepair.com/uploads/1/3/0/7/130776253/144eb7b69a45234.pdf
    • http://transgenderporno.com/uploads/1/3/0/5/130550992/375be25b.pdf
    • http://iqcu.net/uploads/1/3/0/7/130739233/7a9b42ed4cb9.pdf
    • http://xinlangaiwenbocai.f18.ebkf.org/uploads/1/3/0/6/130622103/804672.pdf
    • http://radjam.net/uploads/1/3/0/2/130291908/velegimuz.pdf
    • http://primak.org/uploads/1/3/0/7/130774972/7346518.pdf
    • http://vahotclubs.gammaxiques.org/uploads/1/3/0/3/130323889/130323889.html#passive+voice+present+continuous+tense+exercises+pdf

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000020a3.bin
65ca2fa633a49bc637c245e3469a24bec82cbb291b9200d770c42ee2df1588ac		 pdf-font-stream PDF embedded font (sfnt) at offset 0x20A3 16096 bytes
font_01_sfnt_off00003807.bin
59b09ec55f44f99a91fa7e7917617919145fb2450ef3361bdd57bf150c65c030		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3807 7688 bytes

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