Malicious PDF — malware analysis report

Static analysis result for SHA-256 92a292eeb3ab7485…

MALICIOUS

PDF

74.6 KB Created: 2021-03-25 02:43:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: b410fb30c86c538ebbfef07cae15b528 SHA-1: 835fc26b09485ba43eeda13d9918f397e7b389f8 SHA-256: 92a292eeb3ab748549c021c9f330d375466ae536d8459abe65bb5839921afecc
74 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

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 and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

Heuristics 5

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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/strik?utm_term=excel+formula+if+cell+contains+text+then+return+value PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4473023/normal_6014aaef602d1.pdfIn PDF document text
    • http://boribonabone.mypressonline.com/basic_english_grammar_book_1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4479445/normal_5fd2644db1b75.pdfIn PDF document text
    • http://kigurumi.org/transformers_autobots_assemblexg6p6.pdfIn PDF document text
    • http://usacreditcheck.info/48463123043mjwcc.pdfIn PDF document text
    • http://save50.pro/192075361907q596.pdfIn PDF document text
    • http://euroshopme.site/attestation_pole_emploi_vierge_remplissable_20185ih5o.pdfIn PDF document text
    • http://helplnstagramcontact6088756.com/bovojesexibowelub5kmf.pdfIn PDF document text
    • http://grandov.pro/ferizokizuvugovio8nag.pdfIn PDF document text
    • http://rbqjkwklnd.xyz/quotes_from_thich_nhat_hanh_peace_is_every_stepwte5v.pdfIn PDF document text
    • http://chistohome.moscow/sexanijuxafirwky9o.pdfIn PDF document text
    • http://tanubujurutemut.scienceontheweb.net/interview_questions_for_b_tech_ece_freshers.pdfIn PDF document text
    • http://bioforcecolumbia.site/authors_purpose_in_writing_orpheusycys4.pdfIn PDF document text
    • http://thedouche.xyz/34349706747q3kwl.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://1a899ca6-11bf-4464-971e-4bf0b885e765.filesusr.com/ugd/4ac3ff_95e11e7a103a42ccb6398e225eb53632.pdf?index=trueIn PDF document text
    • https://68358877-4ee6-4e53-94f7-4bd9665c1f53.filesusr.com/ugd/3bbd68_1031232919304c49ba6acdceb9bef6c0.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lezopobigeza/5097960442.pdfIn PDF document text
    • https://9e9203d9-9f5b-42f2-a849-05e42d741f90.filesusr.com/ugd/3527d5_468d15c2d1734c17ac7839ee7eff3fc1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/purawuma/enfermedades_congenitas_del_rion.pdfIn PDF document text
    • https://s3.amazonaws.com/nijosinizo/bad_genius_malay_subtitle_free.pdfIn PDF document text
    • https://6d4a8fb0-9a8a-4850-8aa1-2b5706121c9a.filesusr.com/ugd/ff2e72_c7a4f135f1ce4f80b8985e5acb924977.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/zubata/loan_cancellation_email_format.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_off0000e586.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE586 5208 bytes
SHA-256: 626c4e7bcb047073526abfa2bc0aeee4b55fed7e5b7d308878e2153253cfed3f
font_01_sfnt_off0000f718.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF718 10744 bytes
SHA-256: 872d33ef9c91736a0be126f672fdc6073229a196293c97e6aff7fe9b2a990a4a

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