Malicious PDF — malware analysis report

Static analysis result for SHA-256 087797724b101eab…

MALICIOUS

PDF

83.9 KB Created: 2021-05-02 06:13:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 271fa6308f24a6d44bd6222fd7e766f0 SHA-1: c321837cbec41573bb9f44b60c4600bb17fc2202 SHA-256: 087797724b101eabd327b3975a4349997ec2d665630b0ed4146ac3bd45aad117
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://fokemale.ru/strik?utm_term=gold%2527s+gym+xrs+50+home+gym+weights PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4428329/normal_602b0ea3c7a41.pdfIn PDF document text
    • http://xuzerujagojagip.scienceontheweb.net/60915739844.pdfIn PDF document text
    • http://gedatidigog.sportsontheweb.net/inductive_and_deductive_research.pdfIn PDF document text
    • https://tatabano.weebly.com/uploads/1/3/4/8/134850833/9041131.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4374021/normal_60297d05a69da.pdfIn PDF document text
    • https://totamozosapopa.weebly.com/uploads/1/3/4/7/134712517/rojorikosik_tesexu_sifesovatogapo_titagisagu.pdfIn PDF document text
    • https://fimosezit.weebly.com/uploads/1/3/0/7/130775491/9639776.pdfIn PDF document text
    • http://depusapo.mypressonline.com/kavipufodepoguvaxinuz.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4463551/normal_60030f04d5512.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://51fd5013-30c4-43d1-89ce-86564632a3b5.filesusr.com/ugd/9f06f8_513dfd1704894f18889b60470b3998ab.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bb3e50fe-d2d3-4804-ad8e-331c459bfe9e/4320406181.pdfIn PDF document text
    • https://s3.amazonaws.com/tutapaxi/vawotazevipix.pdfIn PDF document text
    • https://6f4861c6-cdf0-4a5f-ba2d-f9c5e5bfbee6.filesusr.com/ugd/77941b_55822de3b0f14b52a7970ce0554e8c67.pdf?index=trueIn PDF document text
    • https://86cafecd-0af7-43e6-b578-14605c742a6c.filesusr.com/ugd/c4ddd0_12ac3d08186b4ac78f8f3b9c1c96caee.pdf?index=trueIn PDF document text
    • https://89d37d93-eaf9-4fc7-8d5e-07438b8f18e7.filesusr.com/ugd/e80f4c_0bce4265076b433daba217f75f5c0c94.pdf?index=trueIn PDF document text
    • https://01c19f78-c7d0-441a-b56a-8672493f87de.filesusr.com/ugd/9d66c7_8ff8a41db1534cf6a853d799e0ad603f.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/falevi/koninilepivopajoje.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/518d447b-6631-4008-b001-e2eb89d1e463/english_grammar_workbook_class_7th_directorate_of_education_government_of_nct_delhi.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_off00010608.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10608 5620 bytes
SHA-256: c2c3dc9ccb0a48cf44a8316ed9b6a2b5a4f15bf5541c87836eee3f9c201f0ebc
font_01_sfnt_off00011930.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11930 11672 bytes
SHA-256: 1c9255caadce04d798f5eac188ea0e7544762680098458f4fa6de11fb30e3ebb

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