Malicious PDF — malware analysis report

Static analysis result for SHA-256 0c3a2c12fe340a37…

MALICIOUS

PDF

69.5 KB Created: 2021-02-26 15:31:03 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-16
MD5: 942d3ae3099464e348b339be4668b12f SHA-1: 523546a336888dee99b8e7cd990a95be28cdcb25 SHA-256: 0c3a2c12fe340a372eccdf6850f2511fd38c01179cef7d7cda6f3eb27e79f6f6
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 numerous external links, many pointing to disposable domains, suggesting a link farm or phishing lure. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a phishing or malware distribution attempt, likely initiated via spearphishing.

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://soxebez.ru/award?keyword=z+score+table+normal+distribution+calculator PDF link annotation
    • http://indonesia2health.online/zixajupoxesalopamewew4jr6o.pdfIn PDF document text
    • http://select-get.top/sivebizunulpyuv.pdfIn PDF document text
    • http://daravto18.ru/rinemoqpe8u.pdfIn PDF document text
    • http://kungfumalibu.com/35602303377touoh.pdfIn PDF document text
    • http://winwites.space/doodle_coloring_book6ac2q.pdfIn PDF document text
    • http://nekuwagibajese.getenjoyment.net/rurikujolibebupex.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4502920/normal_6006bc327117c.pdfIn PDF document text
    • http://palikexifumalam.mywebcommunity.org/arduino_tutorial_tutorialspoint.pdfIn PDF document text
    • http://honey-love.ru/mother_s_day_worksheett9zjv.pdfIn PDF document text
    • http://zipubezexupoka.mywebcommunity.org/67214863178.pdfIn PDF document text
    • https://cdn.sqhk.co/toralapiluw/iiiienE/51003217773.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/kelageketisefuv/xikafepipumofanifegegetem.pdfIn PDF document text
    • https://s3.amazonaws.com/fixararololu/miwinegeloman.pdfIn PDF document text
    • https://s3.amazonaws.com/patilawasu/70935175609.pdfIn 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_off0000d74e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD74E 5184 bytes
SHA-256: 6df470ca75f0175e0d47d53158268597246b41dcd93959c23b139d484babff03
font_01_sfnt_off0000e8d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8D6 11288 bytes
SHA-256: 9eb69d6921b21e1dccdb62711b924015028e872ffae4e37c93017b586d4357d3

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