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) First seen: 2026-06-04
MD5: 9b82856405d3c19633bb0fda65ddd21b SHA-1: e7651e5abc46dbb05e7791135543f7452365aafd SHA-256: 1ccaaf40dc6f9b239bb732c04ac93c77c22316629854a18ab684b3b7cd1ce1f5
206 Risk Score

Malware Insights

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

The sample is a PDF file flagged as malicious by ClamAV and an ML classifier. It contains a large number of embedded URLs, many of which point to disposable hosting and appear to be part of a link farm. One notable URL is https://vilenefex.ru/wix?keyword=montana+youth+challenge, which is likely a lure. The malformed stream length heuristic suggests an attempt to hide malicious 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.
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://vilenefex.ru/wix?keyword=montana+youth+challenge PDF link annotation
    • https://s3.amazonaws.com/fukepez/blade_and_soul_guide_for_beginners_2018.pdfIn PDF document text
    • http://duwudivusupo.mygamesonline.org/what_is_an_example_of_a_body_paragraph.pdfIn PDF document text
    • http://boforotaje.mywebcommunity.org/sql_query_interview_questions_and_answers_for_experienced_download.pdfIn PDF document text
    • http://majikok.mygamesonline.org/how_to_answer_summary_questions_in_wassce.pdfIn PDF document text
    • https://sagagokibifaku.weebly.com/uploads/1/3/4/6/134625973/xifuwenugobojetexu.pdfIn PDF document text
    • http://zitupow.medianewsonline.com/business_information_system_free_download.pdfIn PDF document text
    • http://loduwij.scienceontheweb.net/54746274149.pdfIn PDF document text
    • https://fenutirixe.weebly.com/uploads/1/3/4/6/134640366/414980.pdfIn PDF document text
    • http://zitalogeloluwiw.mygamesonline.org/bopetiseg.pdfIn PDF document text
    • http://tafakiduwav.scienceontheweb.net/jujabomopupakedilaso.pdfIn PDF document text
    • https://s3.amazonaws.com/serogajugomiji/netflix_family_plan_limit.pdfIn PDF document text
    • https://s3.amazonaws.com/wewuxuviwar/boca_raton_police_department_accident_reports.pdfIn PDF document text
    • http://kozidozilujivox.getenjoyment.net/what_is_the_theme_of_once_more_to_the_lake.pdfIn PDF document text
    • https://motazejiwe.weebly.com/uploads/1/3/4/2/134266269/1b355896c4f.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/zixenun.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/3b43652d-5c48-46d4-bb00-c1991644a09f/how_much_should_a_miniature_dachshund_eat.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4cc850d1-c542-46ad-8673-a27ca2d50bed/how_to_use_dyson_ball_multi_floor_2_attachments.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4475d711-dc54-4141-88f7-78238191a31f/cuanto_es_1_8_inch_en_centimetros.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/420d7aa1-1cb6-48b1-a42b-cd5848d04a70/what_state_has_the_highest_prison_population.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aab4c3e5-fde1-455e-8290-e119765ca5bd/bakudijab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c41b6fd6-7d3e-4b78-a03f-8ce986f731c3/77164681262.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43afb2b7-4ea0-47a9-a619-819811a17c21/2488186132.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f0e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0E3 4896 bytes
SHA-256: 1a96d3aed461eacd4c87b2f286bfc6eed6345ee1b9ba162c6faf5409dccfc802
font_01_sfnt_off000101a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101A4 11704 bytes
SHA-256: e651d38f90859d2e91e3324448147d30e00dd4aca5681c214c90b46d65f973d3