Malicious PDF — malware analysis report

Static analysis result for SHA-256 826ec3546141eeb8…

MALICIOUS

PDF

83.4 KB Created: 2020-12-22 22:03:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: 2ed5023eb1bda54974ecb390e81d7ad6 SHA-1: 9104e726d61c51ce89157d2638ec6d500e8d08e8 SHA-256: 826ec3546141eeb852983e9f19f25252e42f61c610184ca6038800de32d3fb17
186 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. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • 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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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/123?utm_term=force+age+up+toddler+sims+4 PDF link annotation
    • https://rojomitalo.weebly.com/uploads/1/3/4/4/134485393/2174503.pdfIn PDF document text
    • https://xewixubigikuj.weebly.com/uploads/1/3/4/8/134892453/6410770.pdfIn PDF document text
    • https://zoxiniguve.weebly.com/uploads/1/3/4/5/134584112/2903305.pdfIn PDF document text
    • https://zaxavafu.weebly.com/uploads/1/3/4/3/134323176/6543755.pdfIn PDF document text
    • https://kodalogodo.weebly.com/uploads/1/3/4/7/134753778/nikabonukadov.pdfIn PDF document text
    • https://turomanusogagi.weebly.com/uploads/1/3/1/4/131453559/nolilexebizopafiwig.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/c97d98d4-3703-41ba-b3f0-b4e605e38a2b/milliman_and_robertson_guidelines_and_interqual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7c72a488-3a7e-42e6-9430-7336e7011ab3/fundamentals_of_engineering_thermodynamics_solutions_manual.pdfIn PDF document text
    • https://static1.squarespace.com/static/5fc659750a2757459b082a1f/t/5fcb3721da45e86cca9ff74b/1607153441440/artillery_shells_fired_in_ww1.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5430013b-f64d-4b7c-b6bc-b7d3059b5061/41591167932.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2d173aad-e09c-49e6-8509-9683148f784c/41625823734.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116ed984-6866-4884-80d3-6a645f6d0cb1/zulegeve.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fbb98b22-6fe5-4557-ab10-39da0b7d7209/30827750952.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5ea1e712-45c1-4cab-8890-73ffe484534d/business_intelligence_oracle.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_off0000f152.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF152 5436 bytes
SHA-256: 09da2f1c970ff99922e7d2ea776f315439553a52456ac3e235be9a6d5885fb97
font_01_sfnt_off000103c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103C3 11304 bytes
SHA-256: f3e3fc20b615a39b9d7998a045cd6b3c6caa3b6d18754bac5f7aa4c745e250cc
font_02_sfnt_off00012a84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12A84 16336 bytes
SHA-256: b7ec44cfe2208ace95a2ce43e698390e22c67aa42018be4a86f0f90cbe714ace

Open this report in the interactive analyzer, or submit your own file for analysis.