Malicious PDF — malware analysis report

Static analysis result for SHA-256 533ed8b41b755261…

MALICIOUS

PDF

52.6 KB Created: 2020-11-29 03:07:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: ed641ccdc21e386a4db9d34b27719ba8 SHA-1: a88feea15fb3bed82bcc05bda4191f94247a7545 SHA-256: 533ed8b41b755261318d668722a0dc7e222d2afdaff79dd78b21c9205cfc1da6
212 Risk Score

Malware Insights

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

The PDF contains a large number of embedded links, many of which point to external resources, indicating a link farm or redirection strategy. One critical heuristic identified a link to known malicious redirector infrastructure, suggesting the document is designed to lead users to malicious sites for phishing or malware distribution. The ClamAV detection further supports its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8986

Heuristics 4

  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://cctraff.ru/aws?utm_term=cartoon+cat+wallpaper+free
    • https://cdn-cms.f-static.net/uploads/4420244/normal_5fb498f686f3d.pdf
    • https://cdn-cms.f-static.net/uploads/4367903/normal_5fa0ab5adfba8.pdf
    • https://cdn-cms.f-static.net/uploads/4365598/normal_5f9ce3a3c7bcf.pdf
    • https://cdn-cms.f-static.net/uploads/4388173/normal_5f9d9b63295a3.pdf
    • https://cdn-cms.f-static.net/uploads/4454547/normal_5fab5e63261de.pdf
    • https://cdn-cms.f-static.net/uploads/4393359/normal_5fc1f540f19b3.pdf
    • https://vuxarujetununo.weebly.com/uploads/1/3/4/4/134437765/2396324.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/lijopavexanuse/biologia_e_genetica_zanichelli.pdf
    • https://uploads.strikinglycdn.com/files/b0ee652e-dc73-4537-8197-77d4de91560c/jagodurume.pdf
    • https://s3.amazonaws.com/jamokaroxoj/modul_akuntansi_biaya_mulyadi.pdf
    • https://s3.amazonaws.com/foneniz/alison_victoria_married_daniel.pdf
    • https://uploads.strikinglycdn.com/files/4fed0832-420c-431a-877d-9e6daff0884f/17808767248.pdf
    • https://uploads.strikinglycdn.com/files/ef144f87-2897-4251-8152-4d177c71617d/numifubeguv.pdf
    • https://uploads.strikinglycdn.com/files/3d1496ea-0225-49af-9ecb-2ba59636820d/lutuvepepiduzil.pdf
    • https://uploads.strikinglycdn.com/files/22099c14-b0e0-4c7c-87b2-e651d6fd903d/sapuzudeferupamo.pdf
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000bb15.bin
6feb09be8a4be587ad39b2835f4810a2e3bd03350c4c9d5d420d2ba0067cb908		 pdf-font-stream PDF embedded font (sfnt) at offset 0xBB15 4828 bytes

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