Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3bd2a93e5040fbd…

MALICIOUS

PDF

78.6 KB Created: 2021-03-23 04:22:24 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 870eb4dbd76e2d08f795a9cbfb660e2a SHA-1: c624500a97239eec0a152641653e72a0e2e93af4 SHA-256: b3bd2a93e5040fbd3c86435359ea6b838a249c7c2e82df7e6584a07fe771f5a4
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-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://leonvi.ru/aws?utm_term=step+10+inventory+list PDF link annotation
    • http://blognews.top/ill_be_back_stronger_than_ever_quotes8igex.pdfIn PDF document text
    • http://detonic-romania.website/talilawelarumakupacnbe5.pdfIn PDF document text
    • http://kajuzumanaz.sportsontheweb.net/space_food_nasa.pdfIn PDF document text
    • https://cdn.sqhk.co/kikutajaz/gcijgja/66714636367.pdfIn PDF document text
    • http://napodosawukezob.getenjoyment.net/absolute_beginners_guitar_book.pdfIn PDF document text
    • https://cdn.sqhk.co/gufojakig/qidhaQ8/wagidabe.pdfIn PDF document text
    • http://choosenews.space/will_there_be_s_season_3_of_big_little_liesv915q.pdfIn PDF document text
    • http://cooldomen.space/business_proposal_writing_templateopibp.pdfIn PDF document text
    • http://nateribebomulaz.medianewsonline.com/importancia_de_la_tecnologia_en_la_agricultura.pdfIn PDF document text
    • https://cdn.sqhk.co/sedazozesufu/9gg2Tjb/99385028977.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/86ab3c88-d257-452f-9233-bf0733560f13/python_data_science_essentials_review.pdfIn PDF document text
    • https://27420876-d215-4860-9a72-f48db0d0c320.filesusr.com/ugd/4062c2_703da511ffc844d286509a4a625dbcfd.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/94dd88d5-554c-4047-8321-25b94ed76ba6/stock_market_investing_101_course_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c3d84744-1bc7-4eea-92ac-586a8d95b201/zufevozuzuvizoremi.pdfIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_235214fdb2d9483c94bab46f202e7026.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/76173819-82bd-4804-85a0-d2877aac0fcf/popstar_never_stop_never_stopping_streaming_australia.pdfIn PDF document text
    • https://3f9320ff-391d-49df-b192-c557e211a93c.filesusr.com/ugd/469aea_a24f904a5aca4fb3b4c515dc734581ca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/4d67954b-5c3a-42bd-9313-fb59ceb4aec2/xetirofosutopivorixelox.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_off0000f318.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF318 5064 bytes
SHA-256: 587917cb41275b76100d6498439e8e22002be84d330988866ec533283e85c62e
font_01_sfnt_off0001047b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1047B 12744 bytes
SHA-256: 872df8d5ea10a27f020c2de822f33414ef581dea1c7a8bda60565fe88ed379c7

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