Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ea6c50e8b97f397…

MALICIOUS

PDF

69.2 KB Created: 2021-02-13 02:15:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 74ccac2fcaa3f85b58f6298e2bed203d SHA-1: 5476deab97e58930a01f3d4e2de1fae57092b0c5 SHA-256: 8ea6c50e8b97f397efd1bf4db579665d28b5149e30bc5aed7cec952f739cbe9d
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or SEO manipulation tactic. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to distribute further malware or phishing content. While no scripts were explicitly extracted, the PDF structure and embedded URLs are indicative of a malicious document designed to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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://seumenha.ru/wix?keyword=boatsmart+module+5+quiz+answers PDF link annotation
    • https://vinaribibivo.weebly.com/uploads/1/3/1/8/131871854/momorid_metadajivep.pdfIn PDF document text
    • https://cdn.sqhk.co/kajipazuto/eaZgcWx/vida_saludable_consejos_para_ninos.pdfIn PDF document text
    • https://rasajelisulozin.weebly.com/uploads/1/3/1/6/131637016/vevizegewibuli.pdfIn PDF document text
    • https://cdn.sqhk.co/wobuwaseja/ge1S6GI/calendar_days_calculator_excel.pdfIn PDF document text
    • https://serataxufo.weebly.com/uploads/1/3/1/6/131606193/3776664.pdfIn PDF document text
    • https://tobubetabopu.weebly.com/uploads/1/3/4/0/134095895/disaloralisasedi.pdfIn PDF document text
    • https://nimawotamuxagop.weebly.com/uploads/1/3/1/6/131606149/1370854.pdfIn PDF document text
    • https://cdn.sqhk.co/zaborofisi/83W8igh/pentagonal_prism_net_printable.pdfIn PDF document text
    • https://cdn.sqhk.co/rularijulen/ahbY2SQ/70302187271.pdfIn PDF document text
    • https://cdn.sqhk.co/wojusipi/hethhje/coin_counter_bank_uk.pdfIn PDF document text
    • https://vasinurevesodux.weebly.com/uploads/1/3/4/6/134605286/e305197.pdfIn PDF document text
    • https://mopomavimixefor.weebly.com/uploads/1/3/1/1/131164117/7beaf8396c7.pdfIn PDF document text
    • https://davijonixumitu.weebly.com/uploads/1/3/5/3/135349017/jodubogir.pdfIn PDF document text
    • https://cdn.sqhk.co/vefusujix/IjjhgjL/movistar_plus_gratis_2020.pdfIn PDF document text
    • http://doxugivo.22web.org/states_of_matter_worksheet_middle_school.pdfIn PDF document text
    • https://wefogazasu.weebly.com/uploads/1/3/4/8/134880183/8864751.pdfIn PDF document text
    • https://vebupefipi.weebly.com/uploads/1/3/4/4/134497137/8337970.pdfIn PDF document text
    • https://cdn.sqhk.co/jiloduvunilu/Ghhjjib/51042799809.pdfIn PDF document text
    • https://cdn.sqhk.co/gobajejuz/jiIig9D/fetokejix.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://sufumawug.epizy.com/domijijaxegodemuzanogiz.pdfIn PDF document text
    • http://fuvituze.epizy.com/heavy_bowgun_ammo_guide.pdfIn PDF document text
    • http://wometopususap.rf.gd/79408442878.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_off0000d238.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD238 5412 bytes
SHA-256: e7a13a9a3cd04ef9ed1321124ec41260981f9850ef8e6ab8f8b71dab0231e8f4
font_01_sfnt_off0000e4a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE4A1 10184 bytes
SHA-256: 61fb90f0e97dde36af34513254d4f46e6c90b99485554b29de2fe165825fab3c