Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ea7f44aa0696306…

MALICIOUS

PDF

107.8 KB Created: 2021-02-15 02:22:45 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-27
MD5: 73d2dd880b7194d7d40e48444999fd5c SHA-1: 13489967b038103718c10e29123da1c0f72adb6b SHA-256: 4ea7f44aa06963062cd1abb2e31d35eecc5f699e512c597f4fb9310b6c30dd8a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and link farms, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier 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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/aws?utm_term=android+app+development+tutorial+kotlin PDF link annotation
    • https://cdn.sqhk.co/didatife/ijfhjse/jaxuzilipasurotekipam.pdfIn PDF document text
    • https://cdn.sqhk.co/bedogipaxog/gXggKeM/piano_man_movie_cast.pdfIn PDF document text
    • http://nupamimebevoz.iblogger.org/retinografia_glaucoma.pdfIn PDF document text
    • https://cdn.sqhk.co/mugapowejog/4hijhjc/roxijutivigij.pdfIn PDF document text
    • https://cdn.sqhk.co/nomazotesi/jdUjbgj/push_and_pop_in_python_3.pdfIn PDF document text
    • http://goshop32.site/vupimaremuj3fclc.pdfIn PDF document text
    • https://cdn.sqhk.co/goronikel/ibjhhuY/48433626529.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452608/normal_6020f91b01be1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453575/normal_5ff717a28caaf.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://jojofolarimema.epizy.com/sixedalumomasogujukijob.pdfIn PDF document text
    • http://xonowazibekaz.epizy.com/bebas_neue_pro_middle_font_free.pdfIn PDF document text
    • http://xesidif.epizy.com/30443927964.pdfIn PDF document text
    • http://dosevidi.rf.gd/92663753405.pdfIn PDF document text
    • http://rezumasalimod.epizy.com/telategek.pdfIn PDF document text
    • http://fowowoge.rf.gd/acdsee_3._1_portable.pdfIn PDF document text
    • http://zavujosabojid.rf.gd/bleach_brave_souls_newbie_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_off00016671.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16671 5040 bytes
SHA-256: 09358f90c8d778127b651e409353c9cbe3c238389dd7847a4a66b7d1a532f24a
font_01_sfnt_off00017789.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17789 13124 bytes
SHA-256: 13f1b5c17a984c00f8725f1a67838ad6bfcbc92c666820126c36f92c3266837b

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