Malicious PDF — malware analysis report

Static analysis result for SHA-256 cb15c80ef56faeab…

MALICIOUS

PDF

73.8 KB Created: 2021-05-21 11:37:12 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 5267e29c3f090cd7521fa8f0ebd64a01 SHA-1: b5e679a4f3162ec552fa8675a7f75db2d4d72143 SHA-256: cb15c80ef56faeabd345935c8d8bbf89287cf3e7ba1c1f5cead4cdaec09bf3d4
156 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 0.9991

Heuristics 5

  • 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.
  • 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://vilenefex.ru/strik?utm_term=focus+on+california+physical+science+textbook+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417643/normal_5fd330b0ea351.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4464078/normal_5ff6b7d261fa2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380214/normal_5fefe70716fb3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4451220/normal_60383521955be.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380522/normal_5fe5e8e09a689.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4366015/normal_5ff3eac6c024d.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4408481/normal_6023e5c9c9d9e.pdfIn PDF document text
    • https://vanakiti.weebly.com/uploads/1/3/5/3/135323710/sakexitimeburos.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464301/normal_605a5874d0a2c.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387933/normal_60595d9b678c9.pdfIn PDF document text
    • https://fodenipijuf.weebly.com/uploads/1/3/4/6/134618914/4c42328fb393.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/roxawo/97454464578.pdfIn PDF document text
    • https://s3.amazonaws.com/nitirew/andaman_and_nicobar_islands_tour_guide.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/db39276d-3c9f-40e8-8251-a0f181deee4c/introduction_to_embedded_systems_valvano.pdfIn PDF document text
    • https://s3.amazonaws.com/tokudapele/grok_learning_2_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/40086900645.pdfIn PDF document text
    • https://s3.amazonaws.com/xumakomowi/everfi_venture_quiz_3_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6148891f-6dcc-4429-80a3-27d269dcc9d8/75320969994.pdfIn PDF document text
    • https://s3.amazonaws.com/xarojapi/wozutagemisob.pdfIn PDF document text
    • https://s3.amazonaws.com/bulikowexunepov/starbucks_reserve_coffee_menu_malaysia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1f0bd4c3-8946-4cec-b2c3-902952985411/34955177125.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/law_of_conservation_of_mass_chemistry_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8dfd00a1-9b00-47e0-b6fb-862675986e25/samsung_galaxy_note_4_cases_and_covers.pdfIn PDF document text
    • https://s3.amazonaws.com/gorajikunobixi/watch_robin_hood_prince_of_thieves_1991_online_for_free.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_off0000e16c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE16C 5572 bytes
SHA-256: cf31d2a8c26b30f258fe20c6739f21cd577b6d6ca26b422e74d48d9d15a89310
font_01_sfnt_off0000f465.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF465 11180 bytes
SHA-256: 2c6c9849641b5c4d71b6235a982a98690fbed9f5ea29a0193bbfd82c424df42d

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