Malicious PDF — malware analysis report

Static analysis result for SHA-256 c268b30846a49771…

MALICIOUS

PDF

73.4 KB Created: 2021-06-01 05:31:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 2ec28efa430a22819e2d9f0068d8fc24 SHA-1: 0b6b0d5deb1cc01c34252861a81f3e3efc6233f6 SHA-256: c268b30846a497718607938d92c7598eed5f4807460db99ee57324293d982557
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to link farms and disposable hosting, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to potentially harmful content.

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://nomylo.ru/pbw?utm_term=letter+recognition+worksheets+for+preschoolers PDF link annotation
    • https://rawonosegapit.weebly.com/uploads/1/3/5/3/135314608/c6e00b4e9541.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426810/normal_601368e7a9a05.pdfIn PDF document text
    • https://datakazikuvosu.weebly.com/uploads/1/3/4/3/134353567/rovurunopijuwa.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4494417/normal_5fed800ee8b62.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funinupun.pbworks.com/w/file/fetch/144412041/kulaguwerirulamaxuxegu.pdfIn PDF document text
    • http://zeladejan.pbworks.com/w/file/fetch/144442356/32971820992.pdfIn PDF document text
    • http://xofitesu.pbworks.com/f/dovole.pdfIn PDF document text
    • http://zowonixepor.pbworks.com/f/pltw_3.3_1_synchronous_counters_answer_key.pdfIn PDF document text
    • http://mikabipi.pbworks.com/w/file/fetch/144434463/mamamotojilosadigufuso.pdfIn PDF document text
    • http://palixazoke.pbworks.com/f/tovakafut.pdfIn PDF document text
    • http://lekuzax.pbworks.com/f/76472974343.pdfIn PDF document text
    • http://wepoline.pbworks.com/w/file/fetch/144441300/votuxogotodefuvagotad.pdfIn PDF document text
    • http://wiwedano.pbworks.com/f/bypass_frp_samsung_s6_edge_plus_android_7.pdfIn PDF document text
    • http://pozapagula.pbworks.com/w/file/fetch/144417399/vopasadevupepakizoroka.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144414483/economa_bsica_rodas_carpizo_descargar.pdfIn PDF document text
    • http://wejojixi.pbworks.com/f/88544417140.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/f/13564880514.pdfIn PDF document text
    • http://gazumadu.pbworks.com/f/indian_war_of_independence_1857_free_download.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_off0000e185.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE185 5164 bytes
SHA-256: 1848fb7d18a6e842a7aa8e6a03640675df24a7eeac06b4bd9e46b396675f97a8
font_01_sfnt_off0000f336.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF336 10872 bytes
SHA-256: f6ba509f16e6b5f4350cbe49fcb92c5e6069068bc2a0f7c736a752af02474136

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