Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3c3d65334266d75…

MALICIOUS

PDF

84.0 KB Created: 2021-04-28 22:08:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 01dd7fa70089bbd1152e739bcba98b4e SHA-1: e86697f3c0bbc05e0e86e32ada1fc10ceaa4df6b SHA-256: b3c3d65334266d75b6a3b23958c9e2bc68ad83bc51a57669d7ebd840fe8c35b7
166 Risk Score

Malware Insights

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

The PDF document contains heuristics indicating it is a link farm designed to redirect users to external sites, with one prominent URL being https://ponafet.ru/strik. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The document body, though heavily obfuscated, contains text related to restarting a phone, which serves as a lure to encourage interaction with the malicious link.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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://ponafet.ru/strik?utm_term=how+to+restart+my+motorola+phone PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4416150/normal_5fd2f5666fab5.pdfIn PDF document text
    • http://nubuxeki.scienceontheweb.net/apprendre_a_parler_le_franais_couramment.pdfIn PDF document text
    • https://cdn.sqhk.co/likafupat/ZhBhggh/nbc_ct_news_live_stream.pdfIn PDF document text
    • https://cdn.sqhk.co/milibotobov/UhbVBKl/zoragobozitabodemi.pdfIn PDF document text
    • https://cdn.sqhk.co/dadirowuj/h8UVuNT/monster_breaker_hero_hack.pdfIn PDF document text
    • http://bisituz.sportsontheweb.net/basic_computer_programming_book.pdfIn PDF document text
    • https://cdn.sqhk.co/totimujid/mWhbphc/67317173259.pdfIn PDF document text
    • http://vijepuwobewi.mygamesonline.org/mixed_drink_recipes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4372673/normal_6011721678e53.pdfIn PDF document text
    • https://cdn.sqhk.co/kuderoxuz/RNgephg/jugar_candy_crush_soda_saga_gratis_online.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_600f4bb2ab1e4.pdfIn PDF document text
    • https://cdn.sqhk.co/xokekekav/ageXjhm/42834767258.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://95fbbc11-640f-4658-acdf-6e09da746871.filesusr.com/ugd/e42ee3_6a04cb0298f94981aa859cb48ad80ee1.pdf?index=trueIn PDF document text
    • http://vekamodadon.onlinewebshop.net/citation_machine_file.pdfIn PDF document text
    • http://koxolavomuzo.myartsonline.com/joindre_online.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f7029b27-fb9e-40fa-825a-000f8fd305ac/49919906635.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5396c2f9-9746-482d-9dfa-799ec1ab33ec/12836637086.pdfIn PDF document text
    • https://c1d61d78-9bae-425c-b347-ee91470fe4f1.filesusr.com/ugd/60933b_b8f9fe5a41984503af6bc9ae6034ba02.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000107f0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107F0 5212 bytes
SHA-256: 17f48a6ea331e4856cc332aacbebc320e39b9bd383d67c74c25521dc4d61e8a9
font_01_sfnt_off0001198f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1198F 11604 bytes
SHA-256: 1c6dfedb3f4e0525e906c764eff079d231c8ed808609dfdc27d1da84f7d66f94

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