Malicious PDF — malware analysis report

Static analysis result for SHA-256 82956fd36289e297…

MALICIOUS

PDF

88.5 KB Created: 2021-02-27 22:02:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 46dede8ed31292ed1d1f3f6c04211788 SHA-1: 83560a2a16056b0de548eee39d0354d65c7fe9d5 SHA-256: 82956fd36289e297714a8ed860f21bbc8c2acec4ef60a07f8a6afff04a234f78
126 Risk Score

Malware Insights

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

The sample is a PDF document flagged by ClamAV as a phishing trojan. It contains numerous embedded URLs, many of which point to disposable domains and are part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier also strongly suggests maliciousness. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a malicious document designed to redirect users to harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://resalured.ru/strik?utm_term=estructura+de+un+texto+descriptivo+de+una+persona PDF link annotation
    • http://bubble1.space/97149022460vl0da.pdfIn PDF document text
    • http://pozijuza.scienceontheweb.net/thus_spoke_zarathustra_review.pdfIn PDF document text
    • http://bagerisevi.scienceontheweb.net/mazanulime.pdfIn PDF document text
    • http://ronifibofizet.medianewsonline.com/89976905076.pdfIn PDF document text
    • https://cdn.sqhk.co/jawutuwek/eiiPjoD/74898078979.pdfIn PDF document text
    • http://xruhdfo.site/59283359920cbdem.pdfIn PDF document text
    • http://shoop-fk.ru/35466615711is7me.pdfIn PDF document text
    • http://bomaduworofa.medianewsonline.com/how_to_make_easy_ribbon_bows_for_gifts.pdfIn PDF document text
    • http://istlan.space/thrifty_white_pharmacy_locationsmrlik.pdfIn PDF document text
    • http://wotidoteked.mywebcommunity.org/how_to_install_foxit_reader_printer.pdfIn PDF document text
    • http://best-store.club/nwt_bible_pro_apkjr2q6.pdfIn PDF document text
    • http://choosemadam.site/how_to_start_tai_chi_at_home3u0an.pdfIn PDF document text
    • http://lighterusb24.site/506503580125bsz2.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://bavotuvezomevi.myartsonline.com/how_much_does_a_fitness_instructor_earn_in_canada.pdfIn PDF document text
    • http://liroporuki.myartsonline.com/2006_honda_rancher_350_battery.pdfIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/truck_service_advisor_salary.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000105db.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105DB 5120 bytes
SHA-256: e9f8daac02c16b1df15551f6989b1143dc0d56ba79eab40afe215ca8eb7ad57d
font_01_sfnt_off00011763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11763 11668 bytes
SHA-256: 35e6829da080ccce4cf19437b27417df940001fc86f83a36c461481a437babe3
font_02_sfnt_off00013d57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13D57 16064 bytes
SHA-256: 62057359ad22ed6c79ab6a94c34af50e7f9192dd49eed379a27769cab1f8071c

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