Malicious PDF — malware analysis report

Static analysis result for SHA-256 8a910264262de2ce…

MALICIOUS

PDF

67.9 KB Created: 2021-04-07 14:37:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d871375f1b4efc32a845d57064f615d1 SHA-1: 5502f67124085045ddad508727f18cc63291cb2d SHA-256: 8a910264262de2ceed91233e4d616c9b2d67fbe3ec1d2de9d99a3e054c2c1ca7
156 Risk Score

Malware Insights

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

The PDF contains a large number of external links, a technique often used for SEO spam or phishing campaigns. The ClamAV detection and ML classifier strongly indicate malicious intent, specifically identified as Pdf.Phishing.Trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content or facilitate further compromise.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://botokaw.ru/wix?keyword=clopay+garage+door+installation+guide
    • http://kafidovomiguvo.mywebcommunity.org/biochemistry_interview_questions.pdf
    • https://cdn-cms.f-static.net/uploads/4381287/normal_6046abfc11cdb.pdf
    • http://xutefizil.getenjoyment.net/south_african_constitution_1996.pdf
    • https://numokafi.weebly.com/uploads/1/3/2/6/132695525/1aa5e24945.pdf
    • http://pazefezos.mywebcommunity.org/darezopezuvon.pdf
    • http://nopotaz.medianewsonline.com/epidemiologia_y_estadistica_libro.pdf
    • http://pelinebaj.mypressonline.com/aprendizaje_activo_en_preescolar.pdf
    • http://wopizup.mypressonline.com/kumoliveluwu.pdf
    • https://jetujonupukoj.weebly.com/uploads/1/3/1/1/131163664/kozubimof_lunep.pdf
    • https://cdn-cms.f-static.net/uploads/4366381/normal_60339b713093d.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/tarajix/definicion_de_investigacion_cualitativa_y_cuantitativa.pdf
    • https://s3.amazonaws.com/kukazowox/supernatural_beyond_the_mat_cast.pdf
    • http://nopawalaxuwaw.onlinewebshop.net/burda_patterns_free.pdf
    • https://s3.amazonaws.com/niporofez/acbrandres._dll_autocad_2014.pdf
    • https://uploads.strikinglycdn.com/files/09a5833e-e446-4d0c-ae11-53a35be1cecb/jepikirawaguzidafofakepu.pdf
    • https://s3.amazonaws.com/ninasivol/bazizi.pdf
    • https://uploads.strikinglycdn.com/files/6889ba3b-ed34-401c-97f2-74137bb7d24c/67197834657.pdf
    • https://s3.amazonaws.com/bokelur/acne_studios_shoe_size_guide.pdf
    • https://uploads.strikinglycdn.com/files/5435ea83-81b0-418e-bd05-c2aeeddf78d0/how_to_get_adobe_photoshop_elements_for_free.pdf
    • https://uploads.strikinglycdn.com/files/bd0a7df2-af92-4246-bb4c-a9fc3c18b574/harry_potter_5_sinhala_movie_download.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d0e0.bin
a316b93364268537ef51c9cc0c391f598f17ba6b37915c171a5dfd3bda84c179		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD0E0 5132 bytes
font_01_sfnt_off0000e26a.bin
a04df4cd86ef2d5eea30e8efed4d468b2c6aa308518dd68803aad866e7e1490c		 pdf-font-stream PDF embedded font (sfnt) at offset 0xE26A 9420 bytes

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