Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ff5e506f1da588b…

MALICIOUS

PDF

77.2 KB Created: 2021-05-16 07:52:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fdabe681368734f4275289932fbf5229 SHA-1: 6fe58bbe0750474fefaffc6f33575e59ead6957f SHA-256: 7ff5e506f1da588b0dbcc3c2a1d263cc15e2673cc062032f0812df657541ef95
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm on potentially untrusted hosting, suggesting a phishing or malware distribution scheme. No scripts were extracted, but the overall structure and URL patterns strongly suggest a malicious intent to redirect users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9952

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://druttle.ru/strik?utm_term=how+to+calculate+total+flow+respiratory PDF link annotation
    • http://zuvomitapafi.22web.org/dadomasawivemabaxom.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4449004/normal_60597bfdbed20.pdfIn PDF document text
    • http://minesaxofunawi.getenjoyment.net/technique_aquarelle.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4483346/normal_6006c9f026b88.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418013/normal_60491dd684b04.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4405930/normal_60557bd009e87.pdfIn PDF document text
    • http://lagidonak.mygamesonline.org/cardiovascular_disease_file.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413361/normal_6010c55302a20.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386593/normal_600fe54feca57.pdfIn PDF document text
    • http://kutegexuwudaro.getenjoyment.net/car_wash_business_plan_south_africa.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411218/normal_603d2591570a2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4408190/normal_5fc8016233f18.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474985/normal_605a9a57f09df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4421615/normal_6046107f6c58e.pdfIn PDF document text
    • http://berozabekep.sportsontheweb.net/complex_numbers_mcqs.pdfIn PDF document text
    • http://sinofat.iblogger.org/15312192324.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zazofekodoxu.rf.gd/metabolismo_de_las_proteinas_en_el_embarazo.pdfIn PDF document text
    • http://banidokote.epizy.com/axure_tutorial.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ddfca2ca-a205-4b43-ae58-50b24bccc895/xokikoxodelokimelex.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d15a52a4-ea65-45f1-8add-9e1763a7f211/saul_d_alinsky_rules_for_radicals_quotes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/468521c4-f6c6-4f12-82fd-583fdf5987e6/94520279515.pdfIn PDF document text
    • http://pabewuvuxaf.onlinewebshop.net/what_sparked_the_second_american_agricultural_revolution.pdfIn PDF document text
    • http://vodulaxezapudez.epizy.com/manual_de_psicomagia_alejandro_jodorowsky_gratis.pdfIn PDF document text
    • http://rixexoto.rf.gd/ralanetifivubevo.pdfIn PDF document text
    • http://motojanafit.epizy.com/genetic_algorithm_tutorialspoint.pdfIn PDF document text
    • http://nivawuxiki.rf.gd/negoditupiwud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22c216a3-678b-422c-89df-12ff3f88e6aa/78813723903.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/571fbb97-d7cb-4010-af35-22c771fd6aab/xewabu.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_off0000ee53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE53 5164 bytes
SHA-256: c607cd2d475be53f8d0659da5c9953e88ed72fb2c1f7a50f3e1abd7d37f09a2d
font_01_sfnt_off0001000f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1000F 10704 bytes
SHA-256: 5e8353361ee86ac055613457f50e9ee5a9b6de678ca90343b2b2a0069e0fd183