Malicious PDF — malware analysis report

Static analysis result for SHA-256 6d7c28fd6e301bd7…

MALICIOUS

PDF

76.8 KB Created: 2021-03-09 10:53:32 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: a73cb73e5d2df4459d9829231416f868 SHA-1: 3d26a00667cf163c4be6cf6b2f287b8460e35978 SHA-256: 6d7c28fd6e301bd7147eaef7defae1db8782228541f4b4047b154ed7184bc17f
186 Risk Score

Malware Insights

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

The PDF file was identified as malicious by a ML classifier and ClamAV, with heuristics indicating it functions as a link farm. It contains numerous external links, many pointing to disposable hosting or domains associated with SEO manipulation. The primary purpose appears to be directing users to a large number of other PDF documents, potentially for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 6

  • 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.
  • 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://golowaki.ru/123?utm_term=objectives+of+entrepreneurship+education+pdf
    • http://sutiboju.sportsontheweb.net/what_is_pmd_stand_for.pdf
    • https://vuzavadakugodo.weebly.com/uploads/1/3/4/8/134857872/51041.pdf
    • https://kawijidaxo.weebly.com/uploads/1/3/4/8/134891868/golopijiji-wadozutejepa-lizumekakup.pdf
    • http://lofajemami.sportsontheweb.net/will_there_be_a_cma_fest_in_2021.pdf
    • https://novatoful.weebly.com/uploads/1/3/0/9/130969934/cb44112a.pdf
    • https://vavaxomutiposev.weebly.com/uploads/1/3/0/7/130738712/lomizuneli.pdf
    • http://cardioactiveufficiale.site/how_to_enable_dos_command_in_windows_7r9cmx.pdf
    • http://reduslim-ufficialesito.site/fuwasaruluvogafesifcqp2f.pdf
    • http://eslivdrug.space/tevavzanej.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://f8071fb1-33dc-4bb9-9fe9-292e0ca0d861.filesusr.com/ugd/253000_386f544043944e89be07a7cf27715fdf.pdf?index=true
    • http://jiwepatifon.rf.gd/2185557266.pdf
    • https://368051e9-4199-40ea-b9a2-dc6e6f83cb3b.filesusr.com/ugd/6260fe_816e464bf4fb45f5aeff2f80b1a47aaf.pdf?index=true
    • https://9e705916-5bde-4eb8-be9b-8b3e910fbaf8.filesusr.com/ugd/c7a620_f94b46808e174505a47aa195ff082f9b.pdf?index=true
    • https://ec8c99fd-5413-4e38-b6a0-2ccbba71fc6f.filesusr.com/ugd/de02f3_8b1cab11ff524469b89c3ffe065411d9.pdf?index=true
    • https://6f12065f-c45d-410c-b048-6ec23fb2b810.filesusr.com/ugd/02ccf7_30405b55dc514259adfc4a8e165ec4ae.pdf?index=true
    • http://kosinatatit.rf.gd/ielts_academic_writing_task_1_sample_questions_and_answers.pdf
    • https://7fca5364-97a1-4441-b76e-d2c429a59218.filesusr.com/ugd/735424_c003709cc8f840199668a869e142e763.pdf?index=true
    • https://128fc002-9ed4-4a8f-9a6b-83b43563a9ed.filesusr.com/ugd/6812d7_f9e172cf8a2f4adcbc3b01b8595188cb.pdf?index=true
    • https://a44a9d9e-3ce9-422e-9b5d-83ef2d4925cb.filesusr.com/ugd/3234e9_d602e44affb24a3ca963c4258dae8ba1.pdf?index=true
    • https://f815f12b-539f-4060-8ed9-abd2caada31b.filesusr.com/ugd/ceb2e8_af9434acff1c4850bbe6b519393ac47a.pdf?index=true
    • http://belibivizonojo.myartsonline.com/what_does_zero_dipole_moment_mean.pdf
    • https://5efcf519-4c71-4be9-a00f-e1d47ba804c5.filesusr.com/ugd/ebcc4b_254b4c5376f145728dd96c9b14e40acd.pdf?index=true
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ee5b.bin
722dee0b70dda86ba46d333b8f0c32e6f3042bf098a4876da04538c4c45d2dc7		 pdf-font-stream PDF embedded font (sfnt) at offset 0xEE5B 5512 bytes
font_01_sfnt_off00010114.bin
cc56bc33ba989a0d1eb86c1ade6e30fbd9a89bc95544fd70e5bdb55220e25f6f		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10114 10624 bytes

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