Malicious PDF — malware analysis report

Static analysis result for SHA-256 0e10723cef81898f…

MALICIOUS

PDF

76.6 KB Created: 2021-05-30 13:58:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 0810aa2403ed715a6ccb3c098a9248b5 SHA-1: d0b907deb5293a45c4d40c9daadd784ed90fb1d7 SHA-256: 0e10723cef81898f06adb3a707aa145001ad3b90287846f5351b95ec78c7d115
214 Risk Score

Malware Insights

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

The PDF file was flagged by multiple critical heuristics, including a malicious redirector link and a link farm, indicating a phishing or malicious content distribution attempt. ClamAV also detected it as Pdf.Phishing.Trojan. The embedded URLs, particularly the one to dafemum.ru, are highly suspicious and likely serve as the primary mechanism for delivering malicious content or redirecting users to phishing sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://dafemum.ru/123?utm_term=afyonspor+forma+sat%25C4%25B1n+al In PDF document text
    • https://static.s123-cdn-static.com/uploads/4378405/normal_5fc9e4f9af281.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380523/normal_600deaa29b569.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4492259/normal_5ffa8bb57b51c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365636/normal_6037d6eda84c3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4428342/normal_60143f70da56c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450152/normal_6043b7c1cf9ca.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425728/normal_601b8a619dba5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4384460/normal_60562d438f161.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418000/normal_60277b218d630.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365599/normal_60199ca94eab0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4480585/normal_606c36a82000d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4500889/normal_5fc7c4c53f18c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486350/normal_602496e4782d7.pdfIn PDF document text
    • https://lesesaxaxutetu.weebly.com/uploads/1/3/4/6/134613106/5407249.pdfIn PDF document text
    • https://static.s123-cdn-static-d.com/uploads/4480161/normal_60afed8fb6b97.pdfIn PDF document text
    • https://kuvuwivozud.weebly.com/uploads/1/3/6/0/136091804/ff7976f7a141.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4472484/normal_5fd7185c460d0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4401994/normal_5feea7e602387.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4470014/normal_602d70d7e9ff3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408586/normal_601ef5c03daeb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4416792/normal_5fc7c48ccbe61.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4478716/normal_60446b652af03.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4450732/normal_5fc9ce4141645.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000ea0c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA0C 5168 bytes
SHA-256: c4f90b019750b05143d9824e66e6226690898c0dfe660515cc7f85e3541b364f
font_01_sfnt_off0000fb9c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB9C 12768 bytes
SHA-256: a2f090b642aa8001a92a24f63b250eda37a421a5d693165bcd33cec3b012f630

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