Malicious PDF — malware analysis report

Static analysis result for SHA-256 f07c9ec2054646fb…

MALICIOUS

PDF

76.1 KB Created: 2021-01-28 12:48:53 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: d39de400a92dff8d7252a7e8875dc268 SHA-1: e6be1f1c369f9667717f8ad7d87201a991cc84b0 SHA-256: f07c9ec2054646fbdea950e68b038d941fce425aac67255b452da29d67129ed6
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF file contains heuristics indicating it is a link farm on disposable hosting, with a high ML score and ClamAV detection as Pdf.Phishing.Trojan. The embedded URL points to a domain that is likely used for phishing or malware distribution. The document body, though heavily obfuscated, suggests a lure related to school transfer letters.

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 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/123?utm_term=contoh+surat+pindah+sekolah+rendah PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4529893/normal_600a449b23c0a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4467612/normal_600fbc2624a76.pdfIn PDF document text
    • https://vawegoti.weebly.com/uploads/1/3/0/8/130874218/dubosededij.pdfIn PDF document text
    • https://cdn.sqhk.co/parabeset/iguvqha/bmc_software_singapore_glassdoor.pdfIn PDF document text
    • https://jovinafunen.weebly.com/uploads/1/3/2/6/132695325/xavalemexojuduj.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424632/normal_6003899a4fc3e.pdfIn PDF document text
    • http://geguxejap.22web.org/21217962390.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4482415/normal_5fd8b0c8b44bd.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/semuxemakaw/83391880618.pdfIn PDF document text
    • https://s3.amazonaws.com/dogevazapiwediw/free_coreldraw_portable_for_windows_10.pdfIn PDF document text
    • https://s3.amazonaws.com/gadumagabusodel/nutricion_enteral_y_parenteral_arenas.pdfIn PDF document text
    • http://vorasokipat.rf.gd/sql_database_creator_free.pdfIn PDF document text
    • http://joxumokuri.epizy.com/71441167695.pdfIn PDF document text
    • http://nadadeze.epizy.com/87281914213.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_off0000eef6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEEF6 5016 bytes
SHA-256: 6cfc133584c28f661325578403b8b9e402f082f9021820fde7ab0e660003947b
font_01_sfnt_off0000fff4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFF4 10220 bytes
SHA-256: f237f8fb76ee1f7c23fae2caab7c12969b7edda224fd5997503f89e1adee114a

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