Malicious PDF — malware analysis report

Static analysis result for SHA-256 a7b75ba6400e641e…

MALICIOUS

PDF

77.1 KB Created: 2021-03-11 15:52:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: c006f47895b4ced8a430b7827e7f1b30 SHA-1: 277224ecd2e37e5f1afdcddc0a1dc33e7ed7c540 SHA-256: a7b75ba6400e641eb4a90a8241423eb9e6d34d593b3598fa6d647f980c2c28ed
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one identified as a malicious redirector. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a high likelihood of this document being used for phishing or malware distribution by hosting many links on disposable domains. The ML classifier and ClamAV detection strongly support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://dugedepap.ru/strik?utm_term=t+test+apa+format PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4418567/normal_5fe9c58150199.pdfIn PDF document text
    • http://dasiroxejipi.22web.org/kcet_2018_biology_answer_key_by_expert.pdfIn PDF document text
    • https://cdn.sqhk.co/nosilaxuziz/FgebjdL/roweledivoxalunukodonax.pdfIn PDF document text
    • http://lukanovetefitef.22web.org/paulk_workbench_ii_free.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4425515/normal_603f3ae96f292.pdfIn PDF document text
    • https://cdn.sqhk.co/xexanodu/glV4igd/pabunoloduvijepuvaxukesim.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4373241/normal_600352259b3e3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4446512/normal_5ffa4ea3b7cfa.pdfIn PDF document text
    • http://xokubenafap.66ghz.com/blush_formal_dresses_short.pdfIn PDF document text
    • https://cdn.sqhk.co/kifateten/a9Wjiig/freeway_closings_near_me.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/R6ijZ8B/waxadafofurufofidalenu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rajafidaforuzav.epizy.com/88138097253.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/255c36f7-0b39-4d93-a365-fb635ead2620/how_to_clean_the_intex_saltwater_chlorinator_cell.pdfIn PDF document text
    • http://vugapadilubokis.epizy.com/aptoide_apk_2016_ios.pdfIn PDF document text
    • https://80820154-e864-4b0c-832b-212b24169927.filesusr.com/ugd/c12414_8eba953c27fa466ab820fd11956ae6b2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/f2700a7a-c9e1-48bd-8058-e5b39964f6b9/bukunuzerajezisevopigozir.pdfIn PDF document text
    • http://fasevirova.rf.gd/cessna_172n_skyhawk_manual.pdfIn PDF document text
    • https://af18ad75-7652-4b25-b9e0-8da5fded0af1.filesusr.com/ugd/529385_efac94ad6b56457b888bed5236313d09.pdf?index=trueIn PDF document text
    • https://0fc0baf9-b884-4fcd-968e-f93c0f938930.filesusr.com/ugd/68ec51_38cbfa557ed64dd289807bfc73bf6461.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/334b6fe3-70b5-45ea-8eb0-b4d6a9015ace/97584545778.pdfIn PDF document text
    • http://zalezir.epizy.com/best_amapiano_dance_moves_mp4.pdfIn PDF document text
    • http://kimajuj.epizy.com/crusader_crossword_today_answers.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_off0000f0f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0F9 4964 bytes
SHA-256: 5eba1f36e88c311115fc60e49d59e14c81a667dbf428405ecaee46070a78c8bd
font_01_sfnt_off000101c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101C9 11020 bytes
SHA-256: 56c1ef61b85a22ae2c253712ab909614952c2b0ae43b3832c454593b17640195

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