Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ee8c4c86a2e0701…

MALICIOUS

PDF

75.4 KB Created: 2021-04-30 04:41:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 762f11d8dfd4b194f87ac80ad466c1a8 SHA-1: 272bb0078ad762549c39d9445bc15c481a848394 SHA-256: 4ee8c4c86a2e0701c93da1ce1fff396d012d87b51cda5b6bb1df8196aad57c4c
126 Risk Score

Malware Insights

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

The PDF document contains numerous embedded URLs, many of which point to disposable hosting services and are likely part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and extensive URL usage suggest an attempt to exploit users through deceptive content.

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=how+to+replace+a+poulan+chainsaw+chain PDF link annotation
    • https://fawurefo.weebly.com/uploads/1/3/4/4/134441885/xavevoxoxasalopo.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4445343/normal_5ff2861da697b.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387815/normal_602927fcbf8cc.pdfIn PDF document text
    • https://fetazudumaveber.weebly.com/uploads/1/3/4/6/134615608/tevegamajefuxu.pdfIn PDF document text
    • https://zaxizibu.weebly.com/uploads/1/3/4/6/134672664/mowor-defaw-sobenofid-gigujig.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4490371/normal_6052c7d78fd99.pdfIn PDF document text
    • https://cdn.sqhk.co/ganidabizi/aKbGjhJ/wedding_cake_decorating_games.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4369318/normal_5fc952f624f0d.pdfIn PDF document text
    • http://pozufopajosel.mypressonline.com/analysis_and_design_of_asynchronous_sequential_circuits.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4415327/normal_5fccd051417eb.pdfIn PDF document text
    • https://cdn.sqhk.co/doxurozupu/8w7gijh/xojogema.pdfIn PDF document text
    • https://cdn.sqhk.co/sotatixorawi/jgjgfig/xexevuvuta.pdfIn PDF document text
    • https://virerulifig.weebly.com/uploads/1/3/1/4/131407283/mavumawesabukizapav.pdfIn PDF document text
    • https://cdn.sqhk.co/xuxodokoju/hcjfhbM/new_ktm_super_adventure_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/zopimoforaja/ihGjgjb/25069636841.pdfIn PDF document text
    • http://xemizawufogutuf.scienceontheweb.net/tesame.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vavadot.onlinewebshop.net/nanomojalipiwalikafatox.pdfIn PDF document text
    • http://pusapovewazigu.onlinewebshop.net/pudigun.pdfIn PDF document text
    • http://dexivovadoxexo.myartsonline.com/2020_administering_a_sql_database_infrastructure.pdfIn PDF document text
    • https://631ffb88-cf2d-4844-8d6b-9338a1b21cc5.filesusr.com/ugd/d24e6f_b8a88ba42d134c488cc000bf606c70e2.pdf?index=trueIn PDF document text
    • http://jalijoruki.atwebpages.com/cache_memory_types.pdfIn PDF document text
    • https://f187853a-68e6-4ed6-a420-9593b89d6738.filesusr.com/ugd/27c34a_99b2f496d8cc4f65bfdff38fb9da8971.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_off0000ec2b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC2B 5076 bytes
SHA-256: 8210e3009b3a99cfa2fde01b63c231f7f4d9ade074292822e82cfd10c44aac5d
font_01_sfnt_off0000fd6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD6F 10244 bytes
SHA-256: f82a5be09fe2523b4be8eb64c532a6c80542266a59a8a76e19666bba08e6cd52