Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb62a5be7e743650…

MALICIOUS

PDF

68.1 KB Created: 2020-11-10 11:41:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 5b613e30f6ddfbad8b0889a78387e451 SHA-1: eda3c6b84c4d534562861725ebc6a01039725205 SHA-256: bb62a5be7e7436501b96d5631ff4daf3b603c383079e1eeae0271398d7f3d041
156 Risk Score

Malware Insights

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

This PDF file was identified as malicious by ClamAV and an ML classifier, indicating a phishing or trojan threat. It contains a large number of external links, suggesting a link farm designed to redirect users to potentially harmful websites. The presence of embedded URLs and the PDF_SEO_LINK_FARM heuristic strongly support this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • 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://traffking.ru/aws?keyword=carrion+crawler+5e
    • https://cdn-cms.f-static.net/uploads/4408598/normal_5f9e5ad1a7838.pdf
    • https://vozekokojexofu.weebly.com/uploads/1/3/4/6/134645554/jalosezusawawumorotu.pdf
    • https://pawikewam.weebly.com/uploads/1/3/4/4/134445239/tunif.pdf
    • https://cdn-cms.f-static.net/uploads/4375909/normal_5f97e09f1bfdd.pdf
    • https://cdn-cms.f-static.net/uploads/4414514/normal_5f9442e8baf61.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/f42e6d02-7678-4f44-9cde-5dfac9c8fcc5/kunenemixekivobejadumolux.pdf
    • https://uploads.strikinglycdn.com/files/e4b5bdba-d6ad-4fff-9dcc-ae0cd1f19d38/musuligikozebifeketifebi.pdf
    • https://uploads.strikinglycdn.com/files/02b6983e-1bf7-4411-9b5f-3cbb2c06819b/29648758055.pdf
    • https://uploads.strikinglycdn.com/files/9f97ac97-22d8-4bd6-9471-522908f6406d/32243029957.pdf
    • https://uploads.strikinglycdn.com/files/97accb24-8902-4dcb-bee7-e2333bfbb62d/59822316954.pdf
    • https://uploads.strikinglycdn.com/files/d05b9de8-e259-4bbb-bad1-135e61efdbbb/4854768630.pdf
    • https://uploads.strikinglycdn.com/files/f1f75f58-2d98-440a-8909-16444cd438ce/58612875317.pdf
    • https://uploads.strikinglycdn.com/files/443dc40c-66f7-47d5-824e-e3dc5bd57a0a/losuginememubip.pdf
    • https://uploads.strikinglycdn.com/files/dcd4be2b-2c97-47c3-9fca-50e9233b9269/minecraft_better_villages_mod_1.7.10.pdf
    • https://uploads.strikinglycdn.com/files/3117f9d2-6a2f-42f6-807a-bd843b045c9f/lapafopufuv.pdf
    • https://uploads.strikinglycdn.com/files/c77c2162-e5ce-4e38-83a1-40baf211ddee/fizeligom.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf92.bin
755668e3dac4237ae1aedaa58c7f7185f082cb1f52066233a9f2e4d50c70f6c2		 pdf-font-stream PDF embedded font (sfnt) at offset 0xCF92 4736 bytes
font_01_sfnt_off0000dfd2.bin
8bc20a45152d2305524fcd960bdb795cb5f34352c9d8125798d722c2c0673f37		 pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD2 10668 bytes

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