Malicious PDF — malware analysis report

Static analysis result for SHA-256 6f5477c1185dc39f…

MALICIOUS

PDF

76.5 KB Created: 2021-04-09 14:54:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 76aab51980126025fa145ad0877726de SHA-1: 92d7c56716f0223b83db468884ebe812d4e16d4b SHA-256: 6f5477c1185dc39f8f5d9e2a3017981f826d92787162a72d0717f8cde4e59d9e
126 Risk Score

Malware Insights

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

The PDF contains heuristics indicating it is a link farm and has been flagged by ML classifiers and ClamAV as malicious phishing content. The embedded URL, 'https://leonvi.ru/strik?utm_term=secret+shopper+checks+in+the+mail', is the primary indicator of the phishing lure. No scripts were extracted, but the PDF structure and URL suggest a phishing attempt.

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://leonvi.ru/strik?utm_term=secret+shopper+checks+in+the+mail PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4474978/normal_5ffd42723b6a8.pdfIn PDF document text
    • http://alexandreablog.com/zozisufej38ykn.pdfIn PDF document text
    • http://fibaxoxadomi.sportsontheweb.net/oro_agamben.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445532/normal_601e1293f0ade.pdfIn PDF document text
    • http://tugrull.com/xumufetitumasadevafn9xf0.pdfIn PDF document text
    • http://wonder-ita.fun/music_word_search_hard_printablegtex4.pdfIn PDF document text
    • http://vulufinagi.mypressonline.com/asus_rt-ac66u_default_admin_password.pdfIn PDF document text
    • http://sollabs.xyz/bixulabemavojakejarugeitl7e.pdfIn PDF document text
    • http://mscredit.info/85080254175lzbhu.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410678/normal_6064db9eb9b51.pdfIn PDF document text
    • http://dowotezovemalo.mygamesonline.org/altruism_meaning.pdfIn PDF document text
    • http://vurejowug.mypressonline.com/acrobat_app_download.pdfIn PDF document text
    • http://qlemelest.online/tisegexufurtxet.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://f238abdf-92e3-4651-90df-65b6e8a648d9.filesusr.com/ugd/99965f_96a961f443b6471a8654c1c31fd3f3eb.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/wuvepilamamuse/muscle_anatomy_workout.pdfIn PDF document text
    • https://s3.amazonaws.com/tasufagijaremo/fewobepenaresixojadakati.pdfIn PDF document text
    • https://ed21222e-fee3-4fab-8b52-e2ddb7bb35ab.filesusr.com/ugd/e73fea_0b953748aa9944d09148d40203ebdd69.pdf?index=trueIn PDF document text
    • http://mafokesa.onlinewebshop.net/present_perfect_tenses_exercises_with_answers.pdfIn PDF document text
    • https://8a7e94d2-1b07-4399-8a7b-cfebf1eb419e.filesusr.com/ugd/e78b77_2334d0ea8b804e4985606d81c8810173.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sakaburepagase/what_does_f02_mean.pdfIn PDF document text
    • https://46a1ac71-481d-4a85-b709-d40f3a189542.filesusr.com/ugd/143c98_c76b8dd3032c474d8690fdc0015dc002.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/gavapozalilup/blackmagic_atem_pro_iso.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_off0000edb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDB0 5340 bytes
SHA-256: a5c86a78bd054bb1c720f4f6a655062f078708e675e9a109a2c55677b9b5ada5
font_01_sfnt_off0000ffb1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFB1 10836 bytes
SHA-256: 02acc50001c5bf503f90f313bdb4a20391b524b4d86395d17cc7edd70d3060f7

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