Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9dba8b1ad0b37f3…

MALICIOUS

PDF

81.3 KB Created: 2021-04-13 09:48:13 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: d42c7cce631f21e76d607930490d8bf6 SHA-1: 234a95d244254fa43d116732240aad6f706b569a SHA-256: c9dba8b1ad0b37f33e7ce36c9ff70cd671bfa20a377fa180ebecfa583dca3beb
184 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

This PDF file contains numerous embedded links, many of which point to disposable domains and known malicious redirectors. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect the user to malicious infrastructure.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • 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 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/strik?utm_term=navy+training+aircraft+crash In PDF document text
    • http://baffer-shop.space/sobagideruzivolanezi1d.pdfIn PDF document text
    • https://cdn.sqhk.co/goxobuve/iZhi6id/helps_textbook_class_7_science_solutions_download.pdfIn PDF document text
    • https://cdn.sqhk.co/xubewarow/iicnS8y/44427380257.pdfIn PDF document text
    • http://arthromedro.xyz/finatujonase7n74q.pdfIn PDF document text
    • http://segwaywheelchair.ru/gesug75deb.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4453901/normal_5ff0ccdb36931.pdfIn PDF document text
    • https://cdn.sqhk.co/zalivelo/j6GXCjc/atlantic_fleet_winning_battle_of_the_atlantic.pdfIn PDF document text
    • http://sberbank.link/youth_football_training_camp_drills0yhl6.pdfIn PDF document text
    • https://cdn.sqhk.co/waxobakal/giijetO/foramodaxonikonil.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413004/normal_601449d589ea3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4474478/normal_5fc8aa80aecde.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367940/normal_603a08c55a160.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409606/normal_602227cd674b4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4497348/normal_602623f56a616.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/dogazisuze/dolok.pdfIn PDF document text
    • https://s3.amazonaws.com/womirofop/ladysmith_black_mambazo_songs_free.pdfIn PDF document text
    • https://49432a94-54bc-4d13-9d12-ea41d731e1b8.filesusr.com/ugd/a7c689_5dafaf64bf634abdb7a942c9764edf3c.pdf?index=trueIn PDF document text
    • https://4b4b92a8-4ac5-4030-97d5-af0917f8c077.filesusr.com/ugd/0251f0_e7048901b1464a46ac85c7741f0a7078.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xefejevife/bravo_tv_program_guide.pdfIn PDF document text
    • https://eadb47d6-6712-4ecd-aa5a-2cdcf2d90b86.filesusr.com/ugd/c844bf_49f9b4077a4d4c82b064375456af5efe.pdf?index=trueIn PDF document text
    • https://fdf0fb27-5181-4190-8e1a-80fb86d87eb1.filesusr.com/ugd/2410c9_50abaefa80c94414a7ad777ef6721713.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f448.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF448 4800 bytes
SHA-256: 067bbdc596a1a29859422cba5e2580d0b302b779e3ff00eb8feeb46b481c4a66
font_01_sfnt_off00010492.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10492 10840 bytes
SHA-256: 5827b3ef7de22bba3bf8ca14b09ab66b99b1f6955a0cd2fbdf9c216a09c98880
font_02_sfnt_off000129ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x129AE 4324 bytes
SHA-256: 1158d95dac44631f497756703988ba3645251422e7ff0015d3fca430225e7c3e