Malicious PDF — malware analysis report

Static analysis result for SHA-256 abb1efa8009c7881…

MALICIOUS

PDF

77.3 KB Created: 2021-03-05 06:18:05 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7903f3506534fad8a36864d2a343f227 SHA-1: c922f6679973389e92f49476138fa5b5e7d3647b SHA-256: abb1efa8009c788104b6c6049b3a5c60c563fc7ea0effc3aab90a2f805e0f163
184 Risk Score

Malware Insights

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

The PDF contains a link to a known malicious redirector, disguised as a search result for free software. This indicates a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly support the malicious verdict, and the embedded URLs suggest a link farm used for distributing malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://crophysi.ru/123?utm_term=how+do+i+get+final+cut+pro+2020+for+free In PDF document text
    • https://static.s123-cdn-static.com/uploads/4380699/normal_600477e87b00f.pdfIn PDF document text
    • http://juwatorota.22web.org/egypt_lonely_planet_guide.pdfIn PDF document text
    • https://cdn.sqhk.co/xenivoronizu/hqjcUmE/56912629467.pdfIn PDF document text
    • http://fajavipax.22web.org/rapiwudibujezof.pdfIn PDF document text
    • https://cdn.sqhk.co/sapasimemo/ifHY5gi/quest_town_saga_mod_apk_unlimited_tickets.pdfIn PDF document text
    • https://cdn.sqhk.co/fiporalisu/erTiagg/et_spin_blade_elite_10-_30.pdfIn PDF document text
    • https://cdn.sqhk.co/pufowuvikij/phcgcxl/23964914157.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4501965/normal_601ed8a760780.pdfIn PDF document text
    • https://cdn.sqhk.co/xeribaba/7ibAZhh/mutant_creatures_mod_1._12._1_download.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460057/normal_5fc7b703983ca.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/7efe4eb8-4fb0-4d0d-8c82-d0d5e85f0d44/99704506218.pdfIn PDF document text
    • http://kesugoda.rf.gd/dyson_dc44_charger_flashing_green_light.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/27672ebe-363c-433f-b60b-92ecf869d92d/16663202194.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/96de0065-edcf-4e1e-9b75-bbfdc8c66328/resumen_de_la_obra_las_flores_del_mal.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/46b790b0-713c-4a61-b5de-9e314a2ac62a/how_to_read_library_ebook_on_kindle.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a7c97228-c1a1-4c2a-bf28-52e3cfd5c735/fobubevevafegugawok.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a0335f03-ef96-4b35-ab25-7bc11f9673f9/dofufa.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a4ba0fcc-570f-4b78-be4c-9ea5a303fd1b/what_is_the_most_complex_sql_query.pdfIn PDF document text
    • http://wurifikag.rf.gd/parts_of_speech_jeopardy_5th_grade.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/22e0ff47-e7c7-433a-9f43-5073b3c7aae4/asus_mx279_screen_replacement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b48de50e-b02a-4fa0-a235-c3499b0b778b/84647258756.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_off0000ef18.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF18 5472 bytes
SHA-256: e0f68df33a94b4c732ecfaae9f5e12f19b86e7cbd78f0624e7f9b537a3a6c56b
font_01_sfnt_off000101de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x101DE 11060 bytes
SHA-256: 28584417bc634fbb8f5dcd13215d932e36039db655e96ab4a49737e8e3af1cec

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