Malicious PDF — malware analysis report

Static analysis result for SHA-256 26de7eaf82513f39…

MALICIOUS

PDF

73.4 KB Created: 2021-02-19 10:10:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-04
MD5: 0a4b0dfca0eace70c97340c015101fdb SHA-1: f121f865b1485e18d95e3d9249a9a7ea47e20635 SHA-256: 26de7eaf82513f399af66150171fd03965e0cfe56872113d3d37474273833aac
244 Risk Score

Malware Insights

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

The PDF document exhibits characteristics of a link farm, containing numerous external URLs pointing to various PDF files hosted on disposable or suspicious domains. The presence of a link to a known malicious redirector and the high ML classifier score strongly indicate malicious intent. The primary goal appears to be directing users to potentially harmful content through a network of linked documents.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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/wix?keyword=spark+the+definitive+guide+book+pdf In PDF document text
    • https://tovuwofox.weebly.com/uploads/1/3/4/7/134731163/37362.pdfIn PDF document text
    • http://vefaporuzudu.iblogger.org/concordancia_completa_de_la_biblia_reina_valera_1960.pdfIn PDF document text
    • https://cdn.sqhk.co/fabunavaxa/jhUjahj/kubuledesejenodu.pdfIn PDF document text
    • http://tradestaroffice.com/99862917174kj11m.pdfIn PDF document text
    • https://cdn.sqhk.co/teduwugevoki/uijpkhc/marketing_planning_process_diagram.pdfIn PDF document text
    • https://cdn.sqhk.co/betewulo/YAkjbPH/little_baby_bum_nursery_rhymes_list.pdfIn PDF document text
    • https://xesisawizes.weebly.com/uploads/1/3/1/6/131606125/nebexisodewa-forovopemigivu-bibir.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452608/normal_60016a3488c6c.pdfIn PDF document text
    • https://cdn.sqhk.co/kapokosop/ugfgchi/crush_the_castle_unblocked_hacked.pdfIn PDF document text
    • https://cdn.sqhk.co/fuwasokeg/sSc5Hgc/xevonikoxurexowitadise.pdfIn PDF document text
    • http://xujilutobidiko.iblogger.org/92967848013.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410703/normal_5fd7e298c1710.pdfIn PDF document text
    • http://carbackseat.site/xilatowop6acm.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn 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_off0000e2d8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D8 5460 bytes
SHA-256: 0a403309e8413dcff0de1108802684df6728b619beb0eea3d3c03bba3939aa83
font_01_sfnt_off0000f56c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56C 10328 bytes
SHA-256: 3c8a6cd8f48ea9323dc70310a289c06ea9b8706807bbc8aae310cdb490ecd094

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