Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5f4b56a40320c66…

MALICIOUS

PDF

119.0 KB Created: 2021-05-29 20:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 990c85f831599c4644511b9bc81ce686 SHA-1: 54c57fe983b563cfed3f67680297c7c71bc14175 SHA-256: d5f4b56a40320c6631ac78f22fbf93c2a67c10a04d2f16c0663844fdd9f5f51e
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many hosted on disposable domains like weebly.com, suggesting a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were explicitly extracted, the PDF structure and extensive link farm heuristic point towards a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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
  • 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.
  • 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://kuzutuzo.ru/strik?utm_term=path+of+exile+syndicate+cheat+sheet+3.11 PDF link annotation
    • https://metatigizedi.weebly.com/uploads/1/3/1/3/131398099/lemonadutewezulowi.pdfIn PDF document text
    • https://derewoju.weebly.com/uploads/1/3/4/3/134319287/3909580.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4506200/normal_60445fbe4e150.pdfIn PDF document text
    • https://gagopono.weebly.com/uploads/1/3/2/6/132681316/mobavafawon_buduma_fujefir_migagepose.pdfIn PDF document text
    • https://ferutijuze.weebly.com/uploads/1/3/1/8/131856408/dudavunixalo.pdfIn PDF document text
    • https://zimuvudiredefux.weebly.com/uploads/1/3/2/7/132710782/lizezuxapinep.pdfIn PDF document text
    • https://rotalexabif.weebly.com/uploads/1/3/1/3/131381819/xogotedagepab.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4418379/normal_5fc9fa6f9a40a.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4403816/normal_6052500f06ee4.pdfIn PDF document text
    • https://jirorenuges.weebly.com/uploads/1/3/0/8/130874518/b390c8.pdfIn PDF document text
    • https://xuxuratedagofat.weebly.com/uploads/1/3/4/6/134644764/32e1060.pdfIn PDF document text
    • https://dawugagulinejud.weebly.com/uploads/1/3/4/3/134368664/9155401.pdfIn PDF document text
    • https://minileponefij.weebly.com/uploads/1/3/1/0/131070526/1000cfd7fb4ca8b.pdfIn PDF document text
    • https://riwitasaroxaga.weebly.com/uploads/1/3/4/6/134656256/nelibalepotamup.pdfIn PDF document text
    • https://dofidosuxemaxej.weebly.com/uploads/1/3/4/5/134595751/8710640.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/266ac2d6-da8f-4d86-ad40-5638a77c9241/16920388059.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/435cfade-0566-4995-81cf-4740974e8b66/xifofobowadopozi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9f96c41-caf9-4faa-914d-76244afe619f/digital_graphic_designer_salary_uk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/36edac5e-d794-4c90-900b-051ed6e28a18/the_100_book_compared_to_show.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e74a1dc2-ab22-49f1-be4f-b1a732e9bcbf/how_to_fix_my_serger.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/61b3404e-32df-4569-ab4b-b67ddc0f859a/xagavusuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b49f3548-4ed8-4621-94b8-cd31d11e23d0/vox_ac30c2_specs.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52f490df-bd23-49a9-b9e6-46e9340b8c20/lord_of_the_rings_4k_best_buy_canada.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00018872.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x18872 5220 bytes
SHA-256: 6440cc2dbf55a8e1d19a36d298684fff2fa73e11bf28d0e4af76d785b7f6a64d
font_01_sfnt_off00019a43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19A43 11032 bytes
SHA-256: 7d89d21c492a1e24293f3d7737ad451012d9e7b45c5c03a39d1d18cae687e39e
font_02_sfnt_off0001bfb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1BFB0 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f

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