Malicious PDF — malware analysis report

Static analysis result for SHA-256 4fc685297e5bb0e5…

MALICIOUS

PDF

77.5 KB Created: 2021-02-15 08:18:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: b00e6e6a98ba923c4bbaaa2ec7647257 SHA-1: d0de0b8d978db39cb66470fba49383ec5527da13 SHA-256: 4fc685297e5bb0e5b7c9970a3380649557cabfa8a60e5e260dac6b2f97e78509
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm hosted on disposable domains, suggesting it's designed to redirect users to potentially harmful content. The presence of embedded URLs and the overall structure point towards a phishing or malware distribution scheme.

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://leonvi.ru/123?utm_term=young+life+campaigners+questions PDF link annotation
    • https://lutaxebibutemun.weebly.com/uploads/1/3/1/3/131380730/nosaramiwozo.pdfIn PDF document text
    • https://nozijuga.weebly.com/uploads/1/3/4/6/134698325/wukabuwozebuxi.pdfIn PDF document text
    • http://robinmani.site/6002683236xb8ff.pdfIn PDF document text
    • https://cdn.sqhk.co/goduwonon/j8QJrg4/zasogulusi.pdfIn PDF document text
    • https://dasezakam.weebly.com/uploads/1/3/4/8/134883145/wefogap.pdfIn PDF document text
    • http://kihepc.xyz/virtual_dj_mixing_software_for_pc3yzgc.pdfIn PDF document text
    • https://cdn.sqhk.co/wesebewoweva/izpY9Q9/46774485023.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469365/normal_600316a429042.pdfIn PDF document text
    • http://lnstagramcopyrighthelps.com/nakubinojaludpq57o.pdfIn PDF document text
    • http://dapabikokewe.iblogger.org/25033528778.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wiputopi.epizy.com/wow_classic_frost_mage_leveling_guide.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_off0000f280.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF280 5424 bytes
SHA-256: 12cdae48a7027012c6e8fd5aa2f16645e5434426a62aade6c0bc955428493d9f
font_01_sfnt_off000104e7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E7 10564 bytes
SHA-256: 1820b961a5cab4954ed4cabde8537e213ec4c16e223f322ffc2a5bc5204767d7

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