Malicious PDF — malware analysis report

Static analysis result for SHA-256 dbbb11549c35c778…

MALICIOUS

PDF

63.3 KB Created: 2020-11-11 17:49:16 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: b3cdeaf5673539ed2a0fffd6b75e7e2f SHA-1: b431110d96cca348c32c30fa938e11dcb9a294d6 SHA-256: dbbb11549c35c778dcc025da6fb1a3031724b764d97c047c0aafca281fe1d62b
156 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged by multiple heuristics, including ClamAV and an ML classifier, as malicious. It contains a large number of external links, suggesting it functions as a link farm for SEO manipulation or to distribute further malicious content. The presence of external URIs and the PDF_SEO_LINK_FARM heuristic indicate a strong intent to redirect users to potentially harmful websites.

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://trafffi.ru/123?utm_term=sheridan+police+department+wy PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4407081/normal_5fa8c03687a45.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4383566/normal_5f8ba8c13a5f7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4389576/normal_5fa371a0e889b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374540/normal_5f91857f95660.pdfIn PDF document text
    • https://vimugowome.weebly.com/uploads/1/3/4/3/134323071/2529145.pdfIn PDF document text
    • https://safusubugem.weebly.com/uploads/1/3/4/6/134609944/79092.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4385214/normal_5f8ef38370aa3.pdfIn PDF document text
    • https://saxibodusazo.weebly.com/uploads/1/3/0/7/130740440/2be4e355eb630.pdfIn PDF document text
    • https://mojivimimujovo.weebly.com/uploads/1/3/0/8/130874437/44d87feaf8ee.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/vezumobigodub/quality_assurance_in_food_industry.pdfIn PDF document text
    • https://s3.amazonaws.com/jebupofedijakuk/butterfly_valve_assembly.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ae73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE73 5220 bytes
SHA-256: 7b235a4620df697cefee9016122a58cbcfc900a114df0ccf8801ff88c4cd5716
font_01_sfnt_off0000c00e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC00E 10168 bytes
SHA-256: 80ffda89b60c38082327d1bbe6c84243cebdc9a18e6ea6c4b48f16ab68184b82
font_02_sfnt_off0000e2ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2BA 4324 bytes
SHA-256: ff5f0ef16caf3e97cd1984b3a03ea88e11eab8cf63d2ee006085a4b9995833f3

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