Malicious PDF — malware analysis report

Static analysis result for SHA-256 f4e672c0db8a8f1a…

MALICIOUS

PDF

77.8 KB Created: 2021-04-16 00:26:11 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 8a06a46e2f8b867b8636ba4a4d6c3b85 SHA-1: 23e895cb4ab777ad973a66a15cd426281e534c7a SHA-256: f4e672c0db8a8f1a5bd9bf35cc38d08fc9a470782ec401f3670cf5170a9e7c5c
126 Risk Score

Malware Insights

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

The PDF file contains numerous embedded URLs, with a significant portion pointing to disposable hosting and employing UTM parameters, indicative of a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious sites.

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
  • 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://jumiwimov.ru/strik?utm_term=concepto+legal+y+doctrinal+de+los+titulos+de+credito PDF link annotation
    • http://ronefed.iblogger.org/ayushya_homam_mantra_tamil.pdfIn PDF document text
    • http://sowemuperiz.22web.org/ferritic_stainless_steel_grades.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4490539/normal_5ff3f1fd8cb68.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4409238/normal_603c1cf79e375.pdfIn PDF document text
    • https://cdn.sqhk.co/wuwosexed/hfhg3cL/virtual_pet_2000s.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4423442/normal_5fceb09226cf2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4503584/normal_6026cb58e5351.pdfIn PDF document text
    • https://cdn.sqhk.co/muvasesuru/W66PmIk/62505299586.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4425227/normal_5fcb5750c4145.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405899/normal_605868161043a.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/ifhh8tR/votewunigujodutujekuxeg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479254/normal_6068522f55e94.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386095/normal_60192a916cf59.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/48cb6310-4d3a-4ddb-aece-feca41b35e69/jikemezojebebajit.pdfIn PDF document text
    • https://s3.amazonaws.com/tidigudetefumof/zovesarulujavuziromukenaz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c530a8ab-6ac4-4865-ac25-842c8b761fa6/insinkerator_evolution_compact_manual.pdfIn PDF document text
    • https://s3.amazonaws.com/xubifupi/pulawimufatevisevadipexo.pdfIn PDF document text
    • http://mudalulox.epizy.com/acunetix_10._5_full_crack.pdfIn PDF document text
    • https://s3.amazonaws.com/ximupuv/69147367599.pdfIn PDF document text
    • https://s3.amazonaws.com/kimone/coastal_carolina_community_college_paramedic_program.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/77c49a9d-d606-4e33-a953-f1007952b53c/28124640838.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d80d5556-3d44-4e6f-b6b4-5f2a08ecfbf6/38403503512.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_off0000f01f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF01F 5248 bytes
SHA-256: 906f6fb3acc321de9956f9a50f59c33ac40c0ee5442acec295b4e7c17f35a625
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 11564 bytes
SHA-256: dd8659c4ade8b3891948fc32873133a602beb2175ab9c7b432059f721980ebb4

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