Malicious PDF — malware analysis report

Static analysis result for SHA-256 138e79bf7d3ffa20…

MALICIOUS

PDF

66.2 KB Created: 2020-12-13 19:05:19 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: c00d896010998e6aa6691444fbda58ef SHA-1: 8a7df5b8d026cd92b9565c4e78069c24090115e1 SHA-256: 138e79bf7d3ffa202d2969838f9e86b03bad15ff21491257b14f4bfb4d5115a3
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, exhibiting characteristics of a phishing or SEO link farm attack. It contains a large number of external links, with one pointing to a suspicious URL on trafficel.ru, suggesting a potential phishing lure or a mechanism to distribute further malicious content. The PDF_SEO_LINK_FARM heuristic indicates a mass of external PDF links, likely intended to manipulate search engine results or redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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.
  • 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://trafficel.ru/aws?utm_term=grammar+practice+sheets+5th+grade PDF link annotation
    • https://jipidonano.weebly.com/uploads/1/3/4/3/134340070/3927501.pdfIn PDF document text
    • https://kawepuwaseleza.weebly.com/uploads/1/3/4/8/134849925/kewakebixumiwafi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385011/normal_5fd09ef7a7450.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366027/normal_5f8ba83437413.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371799/normal_5fa1ff3412471.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4420039/normal_5fa39c1041ea6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4477635/normal_5fa886de07407.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/fekaduvopigab/pabunelusugasidume.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fbce344be7cfc36344e8aaf/t/5fbcf39729c5e2669025053b/1606218648263/wefujidolajed.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5b4b31a3-f13d-4559-ace7-9a4d6bb91aa2/fojalopategekarorow.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/imf_report_india_gdp.pdfIn PDF document text
    • https://s3.amazonaws.com/zikeko/41992188745.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/acf0d099-cbf1-4875-bbcc-67b5b8ddaf26/65164171487.pdfIn PDF document text
    • https://s3.amazonaws.com/rubidokezive/oneplus_6_android_forum.pdfIn PDF document text
    • https://s3.amazonaws.com/petubapizo/55407176132.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc2f9eaa3bf4b14abb69cf4/t/5fc7b0aec953717e09e1cd28/1606922414976/85102787217.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_off0000c6cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6CF 5612 bytes
SHA-256: 9bf6c7c3b7ff08986acf84c4fb7c9a4b3917ea99b46256947457ad6252dbaa36
font_01_sfnt_off0000d9b1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9B1 9992 bytes
SHA-256: 499632a339e72b381ae8124c7b9c51de94c466369c774cfd371996a49f999e1c

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