Malicious PDF — malware analysis report

Static analysis result for SHA-256 7139d2d524654713…

MALICIOUS

PDF

74.9 KB Created: 2021-05-12 16:47:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-20
MD5: 06aa56d5276ad24ef1de2f4efea21075 SHA-1: 11d12a6ea7b698034b2421d51f734db096713b18 SHA-256: 7139d2d524654713a168ef5e7a06e3657e3495cbfab4e09829df349967ce0aa9
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, many pointing to disposable domains, indicating a link farm designed to distribute malicious content or phish users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery via these external links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://cdn.sqhk.co/nakokixega/zhiKeHm/couper_un_en_plusieurs_adobe.pdf In PDF document text
    • http://bigtittybella.com/lotakazoxuzumnbqr.pdfIn PDF document text
    • http://itasda.online/il_barbiere_di_siviglia_librettouxhdm.pdfIn PDF document text
    • https://vuxulirupam.weebly.com/uploads/1/3/5/3/135346280/gibenu.pdfIn PDF document text
    • http://pedron.fun/dirac_live_bass_management_nad_m10jemst.pdfIn PDF document text
    • https://cdn.sqhk.co/dixejetafap/fIyE98S/minecraft_crafting_and_building_mods.pdfIn PDF document text
    • https://cdn.sqhk.co/panafilaputu/djfjgid/zara_home_locations_uk.pdfIn PDF document text
    • http://bupetud.xyz/pokemon_blaze_black_2_evolution_guidef76fp.pdfIn PDF document text
    • https://cdn.sqhk.co/zupololano/jhcjgjM/98987707825.pdfIn PDF document text
    • https://cdn.sqhk.co/nijalemivowo/htijYig/81605032844.pdfIn PDF document text
    • http://bexixibeguben.sportsontheweb.net/75379229985.pdfIn PDF document text
    • https://cdn.sqhk.co/viwitukaz/bhjDhig/cisco_2960_x_stack_installation_guide.pdfIn PDF document text
    • http://pedrons.space/invisible_influence_of_culture17yjf.pdfIn PDF document text
    • https://cdn.sqhk.co/rinovizifim/jg1IWMv/asking_for_information_esl.pdfIn PDF document text
    • https://fixewanum.weebly.com/uploads/1/3/5/3/135309042/1e1b8563790010.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/dRGGkpkNhSI/wb?keyword=is%20the%20nj%20written%20driving%20test%20hardPDF link annotation
    • https://933afb0c-60ca-4ff4-ba38-e7c804ca925d.filesusr.com/ugd/941881_f9807e497e914fd6b1c896d902e12e1d.pdf?index=trueIn PDF document text
    • https://926fca10-1439-4adc-b819-38dad5327275.filesusr.com/ugd/26d6d3_f3bf83773efc4a7895ba5585225ca603.pdf?index=trueIn PDF document text
    • http://kapirexazi.onlinewebshop.net/avascular_necrosis_of_femoral_head.pdfIn PDF document text
    • https://d4bcd744-2348-4fe3-9006-05b2fcbd3cbd.filesusr.com/ugd/704566_e765a02f5d84418db027a6577c809683.pdf?index=trueIn PDF document text
    • https://de99c131-68bf-4271-bcef-cda292486844.filesusr.com/ugd/f5892c_c2477592a50743e5bd4e71cf2fdac252.pdf?index=trueIn 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_off0000e783.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE783 5220 bytes
SHA-256: 97897c861e77b76f1d80e3838445e827b360a528347577465530b4795319a284
font_01_sfnt_off0000f957.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF957 10924 bytes
SHA-256: 25b68df12948bc6673ecb82d9934804149529405ab68198458d42d099d0260f5