Malicious PDF — malware analysis report

Static analysis result for SHA-256 df2521c5209f520d…

MALICIOUS

PDF

81.8 KB Created: 2021-04-21 17:01:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: d86b61164b806185a960298cfbd4e4cc SHA-1: 89db7989350ec60311954e42d26affe1631ece20 SHA-256: df2521c5209f520db41ee6f25e28afa477fbdfd19de7854a3bd8213584b982a5
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 0.9997

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://midufefew.ru/strik?utm_term=xbox+live+generator+codes PDF link annotation
    • http://kpupnov.pro/566592128928ykje.pdfIn PDF document text
    • http://mir23.xyz/841338764350w26c.pdfIn PDF document text
    • http://8gusevshop.space/arimo_bold_italic_font_freeda1qu.pdfIn PDF document text
    • http://lg-copyright.com/bujivopadizokidusoo4x6.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4385038/normal_5ff9176e1969c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481065/normal_6014b81b89aa1.pdfIn PDF document text
    • http://tronreserve.online/child_care_services_laredo_texaswk0q3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476147/normal_601eab5a1f3c1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489725/normal_605942922dec9.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4413239/normal_5fe68f85d5d4e.pdfIn PDF document text
    • http://wexypay.icu/new_books_like_nicholas_sparks0zde8.pdfIn PDF document text
    • http://prizinsta24.space/33773252111de3s9.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4a0f17ac-6ce6-4c05-9546-25c48d39d9f7.filesusr.com/ugd/cd79e3_81c87a613e1a4397b56738079c95bb85.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/xozeb/platform_number_3_ndls.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/116309ae-2711-4557-9d10-14e120fc1c29/17851584229.pdfIn PDF document text
    • https://s3.amazonaws.com/zerepuzuze/14550402288.pdfIn PDF document text
    • https://s3.amazonaws.com/lanaladu/what_does_three_beeps_mean_when_i_turn_on_my_computer.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/monster_hunter_illustrations_2_art_book.pdfIn PDF document text
    • https://d38713d8-f9e0-49bf-8e72-3f46774ce551.filesusr.com/ugd/b3faf5_5149164877394a728fe42da719628de2.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/ffcb61f8-4907-45f2-bdf2-0f440e087231/48575316371.pdfIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_d25ee6fe59ce41b588ec69511ed2a1f7.pdf?index=trueIn 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_off0000ff80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF80 5352 bytes
SHA-256: bd7de879eeb78e00dc405f4d58ee9c5a97577ac3e967b8a3a82aa1e63499a91d
font_01_sfnt_off000111c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x111C2 12024 bytes
SHA-256: e374e5ef00b50186f4471980537742aaf0e8fb2d1d920cc3046b1f9fb14a5e2e

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