Malicious PDF — malware analysis report

Static analysis result for SHA-256 93e4191cd64e7350…

MALICIOUS

PDF

80.7 KB Created: 2021-03-19 06:46:38 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 13e3c4619b68ab6bf722b582189c3a4b SHA-1: 5481a0757b6134fe4d527fceac29fe2892fe2027 SHA-256: 93e4191cd64e735060f3d274eebfd2c45724f0f98b11a8e58fa7bbdb912ad0af
186 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

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 0.9998

Heuristics 6

  • 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 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://baarspo.ru/award?keyword=affixes+lesson+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4420451/normal_6007009a3a5fa.pdfIn PDF document text
    • https://cdn.sqhk.co/rosomugimo/Ujbgchf/mean_average_worksheets_word_problems.pdfIn PDF document text
    • https://cdn.sqhk.co/xoxamomajil/MgiujjI/cheat_code_sims_4_xbox_one_money.pdfIn PDF document text
    • https://cdn.sqhk.co/xewimoziwuvo/dgg1URn/sapiduvewasafesatikel.pdfIn PDF document text
    • https://cdn.sqhk.co/bebumila/A1igehh/android_api_21_optional.pdfIn PDF document text
    • http://obzorov.site/matogadogimaxewa1hcd5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4493198/normal_601ce17b9f561.pdfIn PDF document text
    • http://xilexevu.scienceontheweb.net/schwinn_220_recumbent_bike_manual.pdfIn PDF document text
    • http://timurberg.ru/the_stand_2020_date_and_timef5i8s.pdfIn PDF document text
    • http://shishkin-seed.xyz/heuristic_evaluation_templategszzi.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/tikofaketonub/15796339276.pdfIn PDF document text
    • https://7f993087-45f6-41f4-96e5-9dcaca18fb91.filesusr.com/ugd/9a92dd_423d6c73b72d43c490e28eb7b995837e.pdf?index=trueIn PDF document text
    • https://77bac38d-831a-46d6-8f22-d7743fcadc58.filesusr.com/ugd/5b9a87_8e3f434238d641dda16de0ddf642b0db.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/mevuzokekenojab/atomization_in_powder_metallurgy.pdfIn PDF document text
    • https://s3.amazonaws.com/napejaxosinages/no_logo_clothing.pdfIn PDF document text
    • https://f84ffea9-2755-49c2-9cb5-47ca8b55fe65.filesusr.com/ugd/0adedf_8ce28f8793d246e191968c4730dc2bbe.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/animal_cell_coloring_answer_key.pdfIn PDF document text
    • http://nejesezape.myartsonline.com/fugebovi.pdfIn PDF document text
    • https://d45380bd-a93d-4ef2-b2bd-4c7806d1f6db.filesusr.com/ugd/5d2cf3_83e392e8ba924861a133b9d4f9b6a505.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_off0000fe44.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE44 4788 bytes
SHA-256: 40857346be83fdd4a0642ae6d31beaf2fee9a2b740e3cb22a28577c588ab7646
font_01_sfnt_off00010eb0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10EB0 11124 bytes
SHA-256: 5b742bf989d900a9b26355acf1439db7161e8a5f36b60b677d6ad16d5f71cc6e

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