Malicious PDF — malware analysis report

Static analysis result for SHA-256 1ccaaf40dc6f9b23…

MALICIOUS

PDF

77.8 KB Created: 2021-03-13 13:36:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 9b82856405d3c19633bb0fda65ddd21b SHA-1: e7651e5abc46dbb05e7791135543f7452365aafd SHA-256: 1ccaaf40dc6f9b239bb732c04ac93c77c22316629854a18ab684b3b7cd1ce1f5
156 Risk Score

Malware Insights

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

The file is a PDF that contains numerous external links, many of which point to unknown or potentially malicious domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and embedded URLs suggest it's designed to redirect users to harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://vilenefex.ru/wix?keyword=montana+youth+challenge
    • http://duwudivusupo.mygamesonline.org/what_is_an_example_of_a_body_paragraph.pdf
    • http://boforotaje.mywebcommunity.org/sql_query_interview_questions_and_answers_for_experienced_download.pdf
    • http://majikok.mygamesonline.org/how_to_answer_summary_questions_in_wassce.pdf
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/xifuwenugobojetexu.pdf
    • http://zitupow.medianewsonline.com/business_information_system_free_download.pdf
    • http://loduwij.scienceontheweb.net/54746274149.pdf
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/414980.pdf
    • http://zitalogeloluwiw.mygamesonline.org/bopetiseg.pdf
    • http://tafakiduwav.scienceontheweb.net/jujabomopupakedilaso.pdf
    • http://kozidozilujivox.getenjoyment.net/what_is_the_theme_of_once_more_to_the_lake.pdf
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/1b355896c4f.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/fukepez/blade_and_soul_guide_for_beginners_2018.pdf
    • https://uploads.strikinglycdn.com/files/3b43652d-5c48-46d4-bb00-c1991644a09f/how_much_should_a_miniature_dachshund_eat.pdf
    • https://uploads.strikinglycdn.com/files/4cc850d1-c542-46ad-8673-a27ca2d50bed/how_to_use_dyson_ball_multi_floor_2_attachments.pdf
    • https://uploads.strikinglycdn.com/files/4475d711-dc54-4141-88f7-78238191a31f/cuanto_es_1_8_inch_en_centimetros.pdf
    • https://uploads.strikinglycdn.com/files/420d7aa1-1cb6-48b1-a42b-cd5848d04a70/what_state_has_the_highest_prison_population.pdf
    • https://uploads.strikinglycdn.com/files/aab4c3e5-fde1-455e-8290-e119765ca5bd/bakudijab.pdf
    • https://s3.amazonaws.com/serogajugomiji/netflix_family_plan_limit.pdf
    • https://s3.amazonaws.com/wewuxuviwar/boca_raton_police_department_accident_reports.pdf
    • https://uploads.strikinglycdn.com/files/c41b6fd6-7d3e-4b78-a03f-8ce986f731c3/77164681262.pdf
    • https://uploads.strikinglycdn.com/files/43afb2b7-4ea0-47a9-a619-819811a17c21/2488186132.pdf
    • https://s3.amazonaws.com/jebokizez/zixenun.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_off0000f0e3.bin
1a96d3aed461eacd4c87b2f286bfc6eed6345ee1b9ba162c6faf5409dccfc802		 pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 4896 bytes
font_01_sfnt_off000101a4.bin
e651d38f90859d2e91e3324448147d30e00dd4aca5681c214c90b46d65f973d3		 pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11704 bytes

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