Malicious PDF — malware analysis report

Static analysis result for SHA-256 2aac6f5a3240b97c…

MALICIOUS

PDF

37.1 KB Authoring application: Nitro PDF
MD5: f1a70e47f7a888913a1a9349a48052d4 SHA-1: 122e6d43e591744283dda63b0da7121bb761afd7 SHA-256: 2aac6f5a3240b97cafd727d58bf17b915482aa70b8a48897128a84d1e1ea5719
150 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 other PDF files, a technique often used for SEO spam or to distribute further malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent. No scripts were extracted, and the document body was heavily obfuscated, preventing a deeper analysis of the specific lure.

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 http://playwithvinyl.net/uploads/1/3/0/5/130539842/bozag.pdf
    • http://createpowtoon.com/uploads/1/3/0/7/130738889/4b3ed2bf6245c.pdf
    • http://jakebrenneise.org/uploads/1/3/0/6/130640197/siwagavumekij_zabupebetit_zosowixeserod_vuzaxiw.pdf
    • http://adsl-67-38-184-25.ccioh.com/uploads/1/3/0/5/130540882/fdee5b5e7c5.pdf
    • http://studiocitynorth.com/uploads/1/3/0/5/130551745/ridubelad-xumubiwaj.pdf
    • http://schulzlegal.ca/uploads/1/3/0/4/130483457/8934641.pdf
    • http://mowmylawnonline.com/uploads/1/3/0/2/130272240/falidobuvid-weditawaxogurot.pdf
    • http://beatzbylex.com/uploads/1/3/0/5/130588943/visikine_xerivotosimuwi.pdf
    • http://hilleke.info/uploads/1/3/0/2/130287939/nuvoloparapo-vadunowe.pdf
    • http://en.promessadamore.net/uploads/1/3/0/2/130288762/6530432.pdf
    • http://iwomenchild.org.uk/uploads/1/3/0/4/130476010/pisexukasigog.pdf
    • http://imgif.com/uploads/1/3/0/6/130604955/1e62a36b63317.pdf
    • http://keynightmusic.com/uploads/1/3/0/5/130589094/af6362adcd0f4.pdf
    • http://youthtensils.com/uploads/1/3/0/5/130543293/1431288.pdf
    • http://www.thenannysden.com/uploads/1/3/0/7/130738596/130738596.html#acca+sbl+exam+march+2019

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00003690.bin
223d7026fc0527164f24afd513ee08f2ee538ae70c59afda645a3c940e5e2c7e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x3690 8156 bytes

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