Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd555b5ef21a4dbb…

MALICIOUS

PDF

40.0 KB Authoring application: Nitro PDF
MD5: bb51e5ec4ce65d9ce985c97e746915fa SHA-1: f21a596f4de4700d5397399d42a9e327073cc8e0 SHA-256: bd555b5ef21a4dbbfeacbd79f98b7e567bd9c15c672d6413f6bef842144430f5
150 Risk Score

Malware Insights

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

The PDF file was flagged by multiple heuristics, including a critical PDF_SEO_LINK_FARM rule, indicating a large number of external links. The ML classifier also assigned a high probability of maliciousness. The embedded URLs point to numerous PDF files on various domains, suggesting a link farm or distribution mechanism for further malicious content. No scripts were extracted from this sample.

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.Dropper.Agent-7990870-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Dropper.Agent-7990870-0
  • 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://bark-blaster.com/uploads/1/3/0/5/130540176/tusevekoriko-woxaferavodowiz.pdf
    • http://princeofbarkness.com/uploads/1/3/0/6/130621321/31dc4.pdf
    • https://kidoniraja.weebly.com/uploads/1/3/0/5/130588649/66ba202e74.pdf
    • http://ssbcmarketing.com/uploads/1/3/0/4/130479171/9221269.pdf
    • http://officialbrookekelly.com/uploads/1/3/0/2/130272278/losimalurim_gifisa_nibifegikesopa_faroxe.pdf
    • http://kimbery-barrett.com/uploads/1/3/0/5/130538862/jukoxinobu-tuluwipupagax-jofifojonurido.pdf
    • http://mebe.donweld.ru/uploads/2020/01/28/xorubivedabujiz.pdf
    • http://pensacolaaudiodocumentation.com/uploads/1/3/0/5/130545098/kiponurefoxoj.pdf
    • http://assinaturareativacaoeletronica.com/uploads/2020/01/28/8303040.pdf
    • http://fantabulousfacepainting.com/uploads/1/3/0/5/130542983/litate_didifax_gukamadoratemuv.pdf
    • http://stefaniesears.weebly.com/uploads/1/3/0/2/130274368/nonomajavimof-vatid-soxagitunu-taxifila.pdf
    • http://mikeflattdesign.com/uploads/1/3/0/7/130739769/130739769.html#bezmaksas+seksa+pozas

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00001608.bin
e8b54e58463b294c94cfa419fe3883fab9bcd7682a57583d545d8a28f84b64cb		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1608 11380 bytes

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