Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdb60918b2b54fa3…

MALICIOUS

PDF

80.2 KB Created: 2021-03-28 06:22:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 2f2509f552087c13c64ed9b5dcdf26c9 SHA-1: 182c2baa433eee4108f309f4dd1272a256e20cc8 SHA-256: bdb60918b2b54fa390f6d428fd8f9e6bd00df26c4cc496b6bcb4c9880186ba99
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

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://vilenefex.ru/123?utm_term=preguntas+del+ser+bachiller+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4371010/normal_5ff8108b5e312.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474722/normal_602e630f928d7.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4452851/normal_5fe54cd0ecfaf.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4401976/normal_604e7d12878c0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4486983/normal_5fd2c8ec4545f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418184/normal_60486da663c4d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4381541/normal_5ff64b0638528.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lakinosoxolebe.epizy.com/wupago.pdfIn PDF document text
    • https://80b1f93a-fe74-4439-a81d-34814fa7a505.filesusr.com/ugd/e56fe2_8cff013c6ad44301b64c3996a39b863e.pdf?index=trueIn PDF document text
    • https://1b53f64c-3596-40ff-86ea-95cec8902569.filesusr.com/ugd/838e7e_2e3161b436f14e548db50aed7b36a1dc.pdf?index=trueIn PDF document text
    • http://mutifesojare.epizy.com/reporters_ink_new_york.pdfIn PDF document text
    • https://1094d5c0-a920-47c7-a1de-7e2d56a92d84.filesusr.com/ugd/47b1e8_9ea0fd23691f4450897fdc9b22fe85e3.pdf?index=trueIn PDF document text
    • https://14864a69-2465-45da-a912-c6f78a3f99b9.filesusr.com/ugd/409ca8_3eb0c99888e44e7393e5c0f4d8c6bb1d.pdf?index=trueIn PDF document text
    • http://bepenopivite.epizy.com/jabadakijanowanifugujir.pdfIn PDF document text
    • http://lexepetilak.rf.gd/roots_and_affixes_worksheets_for_4th_grade.pdfIn PDF document text
    • https://434dcbc4-7bd9-40fe-99bf-e102daebf961.filesusr.com/ugd/07ef24_d878b2315801483aa3bf8ed1ddfed825.pdf?index=trueIn PDF document text
    • https://91e55214-10ad-44cf-a10a-60a9392df58b.filesusr.com/ugd/e1c37d_3e51d09e1b3247039b1e2ee49a5db2d7.pdf?index=trueIn PDF document text
    • http://wijegasijewen.rf.gd/centrica_annual_report_2009.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f076eb3e-4ac4-4eff-92d1-f9a6e9912d72/rimamugekumuf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5cbc9f31-d6f0-4f0e-ad6f-ffaf322c451d/popular_old_black_gospel_songs.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e286.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE286 5556 bytes
SHA-256: d452bad2bb74734768545ecb71071f4286d03b944cd8e127fd8afeae3c2938df
font_01_sfnt_off0000f55c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF55C 12168 bytes
SHA-256: 3cc24e3b1ce018c337a98b2894ced7574c8ccba49357ccd4994d79f5491dacf1
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e

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