Malicious PDF — malware analysis report

Static analysis result for SHA-256 bdbd78e66a8e8e1e…

MALICIOUS

PDF

86.1 KB Created: 2021-05-08 21:05:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: a15830ce29b44b62b024b34c975f07db SHA-1: 0925644f3923d58de592db1b878896eb4341e8a9 SHA-256: bdbd78e66a8e8e1ea4ec511fd7867da70851a665e89dad3b7e34d1d057d1767a
126 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by 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

  • 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.
  • 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://bologen.ru/strik?utm_term=the+50th+law+chapters PDF link annotation
    • https://cdn.sqhk.co/gabadifofibo/grghicG/fedik.pdfIn PDF document text
    • http://pazifelurup.medianewsonline.com/19733928794.pdfIn PDF document text
    • http://waparudadip.mywebcommunity.org/ceniza_de_cascarilla_de_arroz.pdfIn PDF document text
    • https://cdn.sqhk.co/sekigozujeme/MZheIhd/aleister_crowley_free.pdfIn PDF document text
    • https://bonesinidojesu.weebly.com/uploads/1/3/4/5/134591006/6724806.pdfIn PDF document text
    • https://cdn.sqhk.co/figakeves/hbvRjek/ant_radio_service_virus_free.pdfIn PDF document text
    • http://laxofetiduwi.iblogger.org/jemefetatituwemewazanita.pdfIn PDF document text
    • https://nosevale.weebly.com/uploads/1/3/2/6/132683459/lifenim.pdfIn PDF document text
    • http://wewofif.scienceontheweb.net/xikakuzesumefo.pdfIn PDF document text
    • https://cdn.sqhk.co/josozudibud/d4ifin0/school_business_manager_jobs_merseyside.pdfIn PDF document text
    • https://cdn.sqhk.co/gunuzuli/iahhdEe/bounce_the_ball_game.pdfIn PDF document text
    • https://tumunonapuve.weebly.com/uploads/1/3/1/3/131379134/dozufatinix-ketale-fobidujeketu-tobidelop.pdfIn PDF document text
    • http://motuxagajoweji.22web.org/authenticity_in_qualitative_research.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/Bhi1uQH/buxumowimitu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://6a421494-2577-4416-904f-e17348f56b63.filesusr.com/ugd/85e76a_860107aa70974a3198d826ef91fe2fd8.pdf?index=trueIn PDF document text
    • http://lebusepuwiri.atwebpages.com/91298787980.pdfIn PDF document text
    • http://ruzakema.onlinewebshop.net/compressing_files_illustrator.pdfIn PDF document text
    • https://ca06489b-9cc7-4d60-8424-05bb9d91883a.filesusr.com/ugd/35b1aa_78adab1d3bd74c0d818e35f8b96f4a30.pdf?index=trueIn PDF document text
    • https://0298dc5a-7924-4276-8279-06452a5288da.filesusr.com/ugd/b30cf0_1594b5d64aab45f1960bd91aac9f4415.pdf?index=trueIn PDF document text
    • http://mojebevusawibo.rf.gd/android_tv_app_for_tv.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000100a9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100A9 6548 bytes
SHA-256: 96dd2fc0f29e4e72cc5c2e2558c4128b545e184584c6e82281828d37e57e44b6
font_01_sfnt_off000110ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110FF 5328 bytes
SHA-256: 580415e65a689157d40e12ed48cba59b1c4f582b559091b92946f1f9c426f9b2
font_02_sfnt_off00012330.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12330 11164 bytes
SHA-256: e53f674970354834094a327e777bc9f41038c811cc13de56e04b60700dea8e6d

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