Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef9e2ce87c3d6383…

MALICIOUS

PDF

66.6 KB Created: 2020-11-28 09:53:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a3af131e1b1269bd58835f419d3ff206 SHA-1: 3b8dd2b43c5cc6719f318ac382cc97c7f0c54da7 SHA-256: ef9e2ce87c3d6383fba69fa6ac2df4fad5f1a6e5811b35bd84001ffd6b440821
154 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many pointing to suspicious domains, suggesting a link farm or redirection to malicious content. The ClamAV detection and ML classifier also indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful sites, possibly as part of a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8278

Heuristics 4

  • 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.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • External URI info PDF_URI
    PDF contains an external URL action
  • 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://trafficel.ru/aws?utm_term=free+indesign+templates+for+cv
    • https://zegaxazidunuxe.weebly.com/uploads/1/3/4/7/134746987/abbf77fb3a9.pdf
    • https://tenabawik.weebly.com/uploads/1/3/2/7/132710661/7154912.pdf
    • https://zoxuzuxebexot.weebly.com/uploads/1/3/0/9/130969059/4045700.pdf
    • https://nevutero.weebly.com/uploads/1/3/4/7/134716167/ronosinopix.pdf
    • https://cdn-cms.f-static.net/uploads/4366661/normal_5f8882dbd01ed.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/bf73695d-852d-4b9b-abd5-cd2394e91e59/56842109801.pdf
    • https://uploads.strikinglycdn.com/files/1fc1e0a1-be7a-4c7f-8e02-9c74da4b6c67/what_if_its_us_book_characters.pdf
    • https://uploads.strikinglycdn.com/files/091b1f48-7da0-4f29-b673-98f783a92c6f/nexazomiletimad.pdf
    • https://s3.amazonaws.com/senodiw/robur_caldaria_uno.pdf
    • https://s3.amazonaws.com/nowokil/sumerian_votive_figures.pdf
    • https://s3.amazonaws.com/lefemijip/download_bluetooth_app_for_laptop.pdf
    • https://uploads.strikinglycdn.com/files/caebf80d-f7fe-4a62-8a9c-9f24ffaaa8bf/61978817691.pdf
    • https://uploads.strikinglycdn.com/files/7de21f40-73a4-447f-add8-45abc5d373c4/fubaweruxugesudik.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000dac3.bin
969939d46778b61bfbda6a034f1b18ea5c2c02a9afc48ba34281dabc60818348		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDAC3 5488 bytes

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