Malicious PDF — malware analysis report

Static analysis result for SHA-256 d0efcaac7f3264ab…

MALICIOUS

PDF

92.5 KB Created: 2020-11-09 18:18:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-02
MD5: b4d93f1d519d60d7da51e414f1379f43 SHA-1: 59a5c6ff2b28c5ce42a6d113621e463e3fe7e489 SHA-256: d0efcaac7f3264ab72e7a737f4bab307cd52faf4877d4177dfd300bfbce24bf2
214 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and routes users through malicious redirector infrastructure. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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.
  • 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://cctraff.ru/123?keyword=shahadah+in+arabic+text In PDF document text
    • https://cdn-cms.f-static.net/uploads/4384647/normal_5f956f6b72050.pdfIn PDF document text
    • https://jugefisofewutep.weebly.com/uploads/1/3/4/3/134368120/parovojufapuru_pubulef_nomis.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369654/normal_5f957ead65383.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380083/normal_5f9796eb2ad38.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369919/normal_5f890ff67892e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373983/normal_5f894ee8a7485.pdfIn PDF document text
    • https://worozimovazez.weebly.com/uploads/1/3/1/4/131406108/guxofenebi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388050/normal_5f8d1a1bd5e86.pdfIn PDF document text
    • https://goduvozimaku.weebly.com/uploads/1/3/1/3/131380582/1938070.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403141/normal_5f9839e21952f.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/f7896e24-2c2c-4494-90cc-7b4fea587aad/nuvusaxifinulamimu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bd8bc2ca-3034-4bc8-9861-f55cdf227208/70883528068.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5753e396-2654-45c9-ae92-5e01ff625b2b/kafadenaxawafajeluzak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f854230e-4da4-40b7-b405-4d1765943468/clean_master_indir_apk.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000101e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101E5 5128 bytes
SHA-256: bf69d5ac3dd3dd3d55b764e7009a8c78caa4d70572ca3a19b4e171ee06d606a5
font_01_sfnt_off0001134d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1134D 14296 bytes
SHA-256: 88c2142050c39077857af13a0d052e2121f71ed5227a0d516191afd2a29ba385
font_02_sfnt_off00014144.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14144 21476 bytes
SHA-256: e9d7ee10c0178581123801c9b25c1d94d5f94a25ee7eb852a9e499f210dd65ee

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