Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdb189a3edaa697…

MALICIOUS

PDF

70.0 KB Created: 2021-03-10 10:50:11 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: d5971283939808962b6cb6d4708b5a96 SHA-1: 464de06e338dd8d83d269c76072a60e2b6cf9c36 SHA-256: fcdb189a3edaa69782eeaeb5809df7e46551f4c6a583dfd3d5c10528acdfd36f
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, with one identified as a link farm on disposable hosting, suggesting an attempt to redirect users to malicious sites. While no scripts were explicitly extracted, the PDF structure and embedded URLs strongly indicate a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://leonvi.ru/wb?keyword=daily%20reading%20comprehension%20grade%202%20evan%20moor PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4477369/normal_6027b973e21ef.pdfIn PDF document text
    • http://sberbank.link/bepir99ebl.pdfIn PDF document text
    • https://cdn.sqhk.co/libobivole/7jh8dHl/bmc_healthnet_dental_providers.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4422631/normal_5fdf55fc0910d.pdfIn PDF document text
    • http://tulomodev.getenjoyment.net/how_to_put_graco_stroller_back_together.pdfIn PDF document text
    • http://jifarobajis.sportsontheweb.net/printable_grimm_fairy_tales.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/x0gggee/64111249045.pdfIn PDF document text
    • http://medtechnika1.ru/which_sector_is_highest_employment_in_gdpg34l3.pdfIn PDF document text
    • http://kolagozisil.mywebcommunity.org/xipufigesosinivugumuze.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://gogujigasad.onlinewebshop.net/bovigaxolidudapebu.pdfIn PDF document text
    • https://s3.amazonaws.com/rorives/pinusobapawepujun.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/carnot_cycle_problems.pdfIn PDF document text
    • https://d75bbb92-b0e4-4b50-83e6-2443e695523b.filesusr.com/ugd/bc73b9_defb60d5cd3f4ec58fb11c3102a32fb2.pdf?index=trueIn PDF document text
    • https://0ea28b16-58c2-472d-b6be-3e97fe9b7bb6.filesusr.com/ugd/696b8a_d9cc91d676584867974449986b83900b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/muxozuvalubi/47166044305.pdfIn PDF document text
    • https://7fd92c66-d3af-485c-b7a9-31529ddfb1b5.filesusr.com/ugd/997d0f_171a2842a68b47e5af16159669234244.pdf?index=trueIn PDF document text
    • https://a9f3490c-def6-45ea-9957-aefa341d54bd.filesusr.com/ugd/84b587_96e65520a3ed44259723478e5880436f.pdf?index=trueIn PDF document text
    • https://4993f9ff-345c-4c03-a8ec-d4f8dac664d6.filesusr.com/ugd/debbe1_3e021f1e16504d0faf99e0c8268a4fcc.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_off0000d291.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD291 5780 bytes
SHA-256: 48aa1e167e8bce4dec84489a1d84550223519a10046851e94fe8b87c2fcef836
font_01_sfnt_off0000e62e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE62E 10716 bytes
SHA-256: dfa175d243e95ab5620c61b03dd859bf300bcf51e1a044edc6dd0bb079eaaabe

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