Malicious PDF — malware analysis report

Static analysis result for SHA-256 ec9eb806f2d2b553…

MALICIOUS

PDF

73.1 KB Created: 2020-11-25 20:16:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-17
MD5: 104f14bfeebb4545c3941a0a45b14c87 SHA-1: 6c82a4b667216a3cb62c97ae76e5299380b05bb9 SHA-256: ec9eb806f2d2b5534562f3b5ead8ee818d0ed82ebfcff80f802dcc206c620697
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a large number of external links, many pointing to seemingly random PDF files, indicating a link farm for SEO manipulation or phishing. The ClamAV detection and ML classifier strongly suggest malicious intent, likely related to phishing or malware distribution. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool often used to create documents for malicious purposes.

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
  • 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://trafftec.ru/wb?keyword=relative%20dating%20worksheet%20answers%20key PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4374178/normal_5f9da53625d37.pdfIn PDF document text
    • https://jewelilug.weebly.com/uploads/1/3/4/3/134331877/c5fcb0.pdfIn PDF document text
    • https://nuvetifozeg.weebly.com/uploads/1/3/4/3/134358797/fites.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4365639/normal_5f8d31369226e.pdfIn PDF document text
    • https://sojoxatufuwi.weebly.com/uploads/1/3/4/7/134710771/8963714.pdfIn PDF document text
    • https://vekerarefatada.weebly.com/uploads/1/3/4/8/134868636/soxirusujubisifid.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/2df715e9-d85c-4e90-a408-79bfb3740445/nogebakasegusi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/16d6a59e-ea85-432a-978c-c4db773795cb/knorr_pasta_sides_butter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/df11212d-2f64-4c90-9b5d-d0ca2abf8898/fibugeloxigifa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9f3b3e06-c4c4-4cba-8b24-9a12c97e7f54/rigexidomeser.pdfIn PDF document text
    • https://s3.amazonaws.com/leteraxewe/office_2016_cracker.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a342c53-1de5-4f69-98e0-7b292f21c149/canadian_white_pages_reverse_lookup.pdfIn PDF document text
    • https://s3.amazonaws.com/xezujuxoz/wokuvepagogufijija.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4527c45e-dd7e-4342-9282-41db0ee635ab/todixebu.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_off0000dda0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDDA0 5412 bytes
SHA-256: 9e15872c83ae22c997147fa294947d8cb9a482862d88823c52173bb22baa2157
font_01_sfnt_off0000f025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF025 12216 bytes
SHA-256: fc1308c929ca4508c1e1c554a82a18ff1daa377bc04a6666126d386aa6f244c6

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