Malicious PDF — malware analysis report

Static analysis result for SHA-256 4bff0d718269fe05…

MALICIOUS

PDF

78.5 KB Created: 2021-03-23 23:43:01 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-10
MD5: 8f34d7bd98e63d8a8000cacf43cb30a4 SHA-1: ca140ae103ad83d34323cdd57704e188be9e6bc4 SHA-256: 4bff0d718269fe05adaaa04142d1bf49a18cddbb829781ff1062ec0fffc57e8f
194 Risk Score

Malware Insights

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

The PDF document contains a large number of external links, many hosted on disposable domains, suggesting a link farm or SEO spam operation. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. No scripts were extracted, but the presence of numerous external URLs points to the document's primary function of redirecting users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://pelibifir.ru/wix?keyword=star+wars+a+new+hope+transcript PDF link annotation
    • https://cdn.sqhk.co/satijumok/ciaXCgf/touchgrind_skate_2_hack.pdfIn PDF document text
    • https://cdn.sqhk.co/fokofike/LjdjeGc/11488076846.pdfIn PDF document text
    • https://cdn.sqhk.co/setawigiz/m5ijig2/marxism_leninism_maoism_basic_course.pdfIn PDF document text
    • https://cdn.sqhk.co/fubafonu/9ihjiMg/motovlog_brasil_hack_apk.pdfIn PDF document text
    • http://mesimewipotaz.22web.org/check_font_size_in.pdfIn PDF document text
    • https://cdn.sqhk.co/wefadegese/hhhisif/sculpture_garden_nyc.pdfIn PDF document text
    • https://cdn.sqhk.co/gizulakofo/buhHkgj/dining_room_wall_decor_ideas_farmhouse.pdfIn PDF document text
    • http://pubguckazan.com/star_wars_saga_character_sheet_fillable0wu2r.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4482230/normal_5fff66336e3b5.pdfIn PDF document text
    • https://cdn.sqhk.co/sewuvavimebi/DahiGid/update_windows_10_enterprise_manually.pdfIn PDF document text
    • http://flymoney.net/after_book_series_parents_guide269un.pdfIn PDF document text
    • http://garowige.iblogger.org/mental_math_exercises.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/CsaOhdD/77800013952.pdfIn PDF document text
    • https://cdn.sqhk.co/wokuvaxevaji/aghigje/fomesorejifosisak.pdfIn PDF document text
    • https://cdn.sqhk.co/bemapebe/Uied0gi/nemogunifapetop.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4491437/normal_5fd6b1f1a2ca4.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vikuladaputak.rf.gd/wimorazuvafawa.pdfIn PDF document text
    • https://3bdad275-8828-414d-9063-9532e035d791.filesusr.com/ugd/c67d0c_e5de5a5829fe48d2b798325d84860320.pdf?index=trueIn PDF document text
    • http://vetuvadoxawiton.epizy.com/ziduwuf.pdfIn PDF document text
    • https://591e60e9-54e8-4b06-a9a7-f2e0522969d0.filesusr.com/ugd/1fd4b7_0252a731d85c4befbf1b80071771f6e5.pdf?index=trueIn PDF document text
    • http://wapibuzam.rf.gd/lewis_medical_surgical_nursing_ebook.pdfIn PDF document text
    • https://d6b7b3c7-8429-4d82-9d75-5d5d09e763cc.filesusr.com/ugd/a8c229_679e87c733e8438e983f2e6adf1d48d8.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_off0000f4fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FC 5184 bytes
SHA-256: f2ade7be5e07e2e47296d13e51450df5a0b3ef3f57aeb60cd11567bd964ab940
font_01_sfnt_off000106aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106AA 11108 bytes
SHA-256: ecadf6031d0bec87c66c8dc545a3ad191f77844ae3a77fc47067e53f5b01cda0

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