Malicious PDF — malware analysis report

Static analysis result for SHA-256 11f7752ef2785371…

MALICIOUS

PDF

80.4 KB Created: 2021-02-15 10:45:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 916edf51d8ae134a1b3115866dfad986 SHA-1: 11180237930939f19d23b49754955c50d7d3074f SHA-256: 11f7752ef2785371379ee8aa9916f7c7ca64461f01624bd858549f6c063d5e13
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 0.9998

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://maypoin.ru/wix?keyword=chapter+10+review+states+of+matter+mixed+review PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4388421/normal_5fe153dd66f03.pdfIn PDF document text
    • https://gilepijojuju.weebly.com/uploads/1/3/2/7/132740412/4145142.pdfIn PDF document text
    • https://nopewiviguzine.weebly.com/uploads/1/3/1/1/131164125/subuwiritopi.pdfIn PDF document text
    • https://vuxuminitemup.weebly.com/uploads/1/3/0/8/130874085/8010055.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4402944/normal_5ffda6c2dca8c.pdfIn PDF document text
    • https://pinowutofabu.weebly.com/uploads/1/3/4/7/134763632/nofasuxos.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473047/normal_5ff46feb7e0e2.pdfIn PDF document text
    • http://usmileofficial.site/retro_video_games_brooklynjffr4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369656/normal_601b2e8a38710.pdfIn PDF document text
    • https://rezibaxuxemabu.weebly.com/uploads/1/3/1/4/131453555/rijowaxisarupivurume.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481055/normal_602a32a03cb66.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/gimisorixosu/blackstar_id_core_100_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/jazofi/competitive_examination_questions_and_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nilititonawafim/sijorejik.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_off0000fcba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCBA 5568 bytes
SHA-256: 26db16ccc7ad7d4c427ecf96e60c5f09074f9c7c88de2e3e1301b49b86a49db4
font_01_sfnt_off00010f95.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F95 10872 bytes
SHA-256: 890e3c7b95f3e800d18f726308e256444d952ce595f64f973a6b82f021e0c9eb

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