Malicious PDF — malware analysis report

Static analysis result for SHA-256 4f707126be9c950b…

MALICIOUS

PDF

78.2 KB Created: 2021-05-01 04:09:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 7845ef096c3417d285ad7c31a9a80c4a SHA-1: 82be8f423a29be8e07a6f12e6470784c35a2cad4 SHA-256: 4f707126be9c950b1cd61b82e9ea254b5d2690b1192c652e70ea50f1f274dddc
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://leonvi.ru/strik?utm_term=edgar+allan+poe+annabel+lee+analysis PDF link annotation
    • http://koteyarn.moscow/english_as_a_second_language_programs_near_mefmyvs.pdfIn PDF document text
    • http://hallop.xyz/83496923527rf52m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4473656/normal_5fcc253aa7847.pdfIn PDF document text
    • http://startask.ru/what_to_serve_pulled_beef_witha93ki.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495034/normal_600f1a2228689.pdfIn PDF document text
    • http://sayfelengs.space/jizirarolasedrv75d.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/4816cb7b-1fbd-4c1f-ae00-09e2ddc04894/61884691844.pdfIn PDF document text
    • https://e966359d-176b-477a-9ad9-c314bea94227.filesusr.com/ugd/fa6f14_49c0f5bd2abe4aedbb54c5042b08f9cb.pdf?index=trueIn PDF document text
    • https://25f35837-e8ad-4357-b490-8f69bec4165a.filesusr.com/ugd/96c61c_7f25d6a7775c4debaf64893fe3ce51d1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/cb35d54f-d698-42be-ba51-17768adae270/55960634703.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6a64a608-0d29-40b5-913d-3253a96dd046/gopidemirupuvebovevi.pdfIn PDF document text
    • https://63995da9-74be-4895-8497-a4fa53c9845d.filesusr.com/ugd/788c84_a090314d3e454e64a06417da5757f3c0.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/6281f082-37e7-409d-8c45-af1a0de8b37a/how_to_write_six_hundredths_in_decimal_form.pdfIn PDF document text
    • https://77bc4ea4-de20-41c0-a463-a5315db628d9.filesusr.com/ugd/2c69e3_fd94ae6a0d79474192941b300937bd84.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/d65b854d-e519-4b1f-b5ba-44a3edf9d0e4/advantages_and_disadvantages_of_capitalism_socialism_and_mixed_economy.pdfIn PDF document text
    • http://wavudipikudela.epizy.com/basic_survival_english_practice_book.pdfIn PDF document text
    • http://dejoxatumiki.rf.gd/13311087088.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_off0000f3c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3C3 5324 bytes
SHA-256: 2df2e64e1507329517379060b02419823075abb63720d0390cfb308d336b625f
font_01_sfnt_off000105f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105F1 10604 bytes
SHA-256: 757765e555671490c4b929f7545397065bccec6bfc122a9d5d0b2bf08baee882

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