Malicious PDF — malware analysis report

Static analysis result for SHA-256 c9ed88cf9eb202e6…

MALICIOUS

PDF

77.1 KB Created: 2021-06-13 02:16:41 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: f73f104a9fb8fdb4fe2902632330cc76 SHA-1: 35e1701acdb20dfb95b62f9488ea265479c6011b SHA-256: c9ed88cf9eb202e6b4a0eb4bc290a85efe7202482c31f2b7299d569ae47ef0e5
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 0.9991

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://inwebjor.ru/pbw?utm_term=android+mame+emulator PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4402718/normal_601465c805d96.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5fd63e64551df.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426953/normal_600b71b418cb1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451227/normal_5fe8f7a09f5a5.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4387056/normal_5fe235a157af9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4370989/normal_60beb5ce90175.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386349/normal_5fdc5da6a4bf3.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473410/normal_5fdf38bd8dec8.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4373511/normal_6045111833015.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414174/normal_604a3eff2975e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4418973/normal_6035f36c17955.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://suwoluran.pbworks.com/w/file/fetch/144772866/fovebatonejare.pdfIn PDF document text
    • http://kelivesas.pbworks.com/f/how_do_i_use_my_sq11_mini_dv_camera.pdfIn PDF document text
    • http://buvulareka.pbworks.com/f/70966697173.pdfIn PDF document text
    • http://fevuxowina.pbworks.com/f/mavizexopekebigujilejafir.pdfIn PDF document text
    • http://bovozajezo.pbworks.com/f/89887851504.pdfIn PDF document text
    • http://beratirupo.pbworks.com/w/file/fetch/144559560/niv_zondervan_study_bible_premium_leather_black.pdfIn PDF document text
    • http://jivevisubido.pbworks.com/w/file/fetch/144984993/bowetilegosinugo.pdfIn PDF document text
    • http://nilanom.pbworks.com/w/file/fetch/144425166/galaxy_tab_ce0168_specification.pdfIn PDF document text
    • http://vomedujel.pbworks.com/w/file/fetch/145177041/congruent_triangles_proofs_worksheet_answers.pdfIn PDF document text
    • http://javefanudosa.pbworks.com/f/vutomupeberaxupozozuj.pdfIn PDF document text
    • http://betikox.pbworks.com/w/file/fetch/144877512/26260991540.pdfIn PDF document text
    • http://puxivir.pbworks.com/f/90973099301.pdfIn PDF document text
    • http://vixasoli.pbworks.com/f/two_step_linear_equations_worksheet.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_off0000f04c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF04C 4780 bytes
SHA-256: 372a6cb0c620441b935575d83be04647e119003e4ff1790e31b74c76fe98441e
font_01_sfnt_off0001006f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1006F 11268 bytes
SHA-256: 2c58e92abdc1592d71e7946c574b2217bbf417248d5bac5991873f2c7dad6669

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