Malicious PDF — malware analysis report

Static analysis result for SHA-256 3efb187ef44cc863…

MALICIOUS

PDF

66.2 KB Created: 2020-11-30 20:02:48 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-11
MD5: cc3e2a296f947a664ee70ca000db56d6 SHA-1: 2d6929eca39b8c23b7d3ab66c303262f3c01ea0f SHA-256: 3efb187ef44cc863ad9130ae8f0b14e29f3d34410b0717c48afc3ea0878b2a59
254 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF contains a critical heuristic firing for linking to known malicious redirector infrastructure and a high-confidence ML flag for maliciousness. It also exhibits characteristics of a PDF link farm, with numerous embedded URLs pointing to external PDF files. The presence of a 'Password-protected archive lure' heuristic suggests a common tactic to bypass gateway security. While no scripts were explicitly extracted, the nature of the link farm and redirector points towards a phishing or scam campaign, likely leveraging embedded JavaScript or exploits to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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.
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://traffmen.ru/aws?utm_term=twist+wala+love+song+ringtone In PDF document text
    • https://vepiduworubul.weebly.com/uploads/1/3/4/7/134723348/jisuludipe_gofizifisijibi_nepomara.pdfIn PDF document text
    • https://dezusopivelisuk.weebly.com/uploads/1/3/4/7/134734284/1455209.pdfIn PDF document text
    • https://belafawejogawol.weebly.com/uploads/1/3/4/5/134583754/9074411.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428083/normal_5fad762d3f8fe.pdfIn PDF document text
    • https://kevujabuguve.weebly.com/uploads/1/3/4/7/134745112/6cad9c0b.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/67870b6c-0ac6-4b88-b7a8-c646b15e2cbc/nuvijawulabedemovepotule.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58bdcf9d-7765-443c-a60d-f9c6ba66d93e/2825570057.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/85311606-b982-4c96-81b0-e66df4aea722/3384597710.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d3f16587-4ebd-4e16-947b-24bab54e97ac/netun.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3eb027fb-2eb5-4aba-9503-2e2edd75c118/altra_furniture_owen_student_writing_desk.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000c6e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6E7 4952 bytes
SHA-256: 2ae2996899b477099f5992069797554cdd1644c1b99da69200ce42feb363d430
font_01_sfnt_off0000d7ea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7EA 10628 bytes
SHA-256: b96190e18c15d6300386d7b4f558d56abf6db5540530d65c1d2173a7c00dcfd7

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