Malicious PDF — malware analysis report

Static analysis result for SHA-256 e43ec8169cd57cce…

MALICIOUS

PDF

77.9 KB Created: 2021-03-12 03:52:31 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 27a401766519ec3f89e4ad47932f450a SHA-1: 93b45758a27368735433e833ee10be502ebd5307 SHA-256: e43ec8169cd57ccee36b6db5b60b77c398bb9dddbd7614977d2eec011b271bdc
194 Risk Score

Malware Insights

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

The PDF contains numerous external links, characteristic of a link farm designed to obscure malicious destinations. The presence of a 'Download Now' lure and ClamAV detection as 'Pdf.Phishing.Trojan' strongly indicates a phishing or malware distribution attempt. While no scripts were directly extracted, the PDF structure and link farm suggest it's part of a larger malicious workflow, likely leading to a second-stage payload download.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://baarspo.ru/award?keyword=ebook+reader+pdf+free+download PDF link annotation
    • http://service-hire.com/letter_format_to_principal_of_schoolzi6ib.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4372721/normal_5fed0c345ab8d.pdfIn PDF document text
    • http://dalnoboyi.xyz/39534897364kgh6e.pdfIn PDF document text
    • http://hookup681.site/how_do_you_become_culturally_competent_in_healthcarewmd5u.pdfIn PDF document text
    • http://hydrofthol.space/how_do_i_identify_a_ford_ranger_transmissionztzxi.pdfIn PDF document text
    • http://reflectionss.space/performance_fee_calculation_methodologyqrajv.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422385/normal_5ff65838ce737.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4388426/normal_5fec78e5d67a1.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://e082cb0d-9c22-4a21-acb7-e2c6127a51d3.filesusr.com/ugd/ff0c06_9b56abcf008a422291eeb2a00ab67d7a.pdf?index=trueIn PDF document text
    • http://gabatotudam.rf.gd/13217119652.pdfIn PDF document text
    • https://7a579b3f-ce96-4c66-abdc-991530493d29.filesusr.com/ugd/010c6b_429b9e9700b4493dae1bb32afa0bc8f0.pdf?index=trueIn PDF document text
    • https://3f46bf15-0a8c-4e80-b3e5-a2e3bf90e008.filesusr.com/ugd/8e6e76_e1fb5206a67f4d32999e547b83583887.pdf?index=trueIn PDF document text
    • https://5e73d190-47a4-4ead-99bf-7e9069f06a16.filesusr.com/ugd/55cc32_7672011e15e44328be88f65819b9839d.pdf?index=trueIn PDF document text
    • https://f37c3615-20b0-4e70-b1e7-2acf34113780.filesusr.com/ugd/1e533a_f0f32612b5b14b7680c1d228eb8e65ed.pdf?index=trueIn PDF document text
    • https://f33d1b56-f518-462b-b61f-c1b5c1ba661c.filesusr.com/ugd/1c44ce_3962a6e8e9304b8a8f00b92ac8bfd25d.pdf?index=trueIn PDF document text
    • http://bobatinufej.rf.gd/sigowasiroleg.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_f23827aaf1d847399377b3565b52b4ae.pdf?index=trueIn PDF document text
    • https://ebd73b9a-b255-48a5-b781-2bd84b483b4c.filesusr.com/ugd/956c05_157738ad68c445b79abf3479db33d5e9.pdf?index=trueIn PDF document text
    • https://694dae7a-2033-4a59-8b06-91ff4eec0774.filesusr.com/ugd/e1d58f_a8bbad46d143497f87089cf7d1d6f79d.pdf?index=trueIn PDF document text
    • https://05b56818-8b0b-4484-a411-4f1234233f1c.filesusr.com/ugd/e49726_70e75f88eed04d01b1820c42ac03a83e.pdf?index=trueIn PDF document text
    • https://82cb18f6-4a40-4824-ac11-10070f72ce02.filesusr.com/ugd/5aec95_bb15d8056b1b425bb843be0d5a5e0536.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_off0000f389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF389 5108 bytes
SHA-256: 6b47a01631a18435fca718d4335cbcc5bc059e5a1c874443952096f8d535c694
font_01_sfnt_off00010509.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10509 10744 bytes
SHA-256: 0f28885dc270b214a54524b38cca015b929a6e226f85f62373e8f33495e34337

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