Malicious PDF — malware analysis report

Static analysis result for SHA-256 fa5f69d2399d3001…

MALICIOUS

PDF

77.8 KB Created: 2021-03-19 21:35:57 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 55e48a7e60ed9a2393d7efba73578522 SHA-1: 0844d552b939dda43bc9c77d230b4f1e307a9f91 SHA-256: fa5f69d2399d30017c1c923cec535c08fbfbd43d59a2e77f64cdfa36f18f6d8c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It functions as a link farm, directing users to numerous external websites, many of which are hosted on disposable domains and utilize UTM parameters, suggesting a phishing or malware distribution scheme. The embedded URLs and the PDF's structure point towards an attempt to trick users into visiting potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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 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=tom+sawyer+comic+book+pdf PDF link annotation
    • http://chtotakoebezuz.biz/microsoft_office_2013_free_download_for_windows_7_64_bit4zde6.pdfIn PDF document text
    • https://gowobokibisalo.weebly.com/uploads/1/3/0/9/130969305/9692564.pdfIn PDF document text
    • https://wetogukonitama.weebly.com/uploads/1/3/3/9/133997956/79f5f38.pdfIn PDF document text
    • http://macsk.space/4857427734sash9.pdfIn PDF document text
    • http://aromaita.space/what_are_the_rules_of_consideration8x3ke.pdfIn PDF document text
    • https://cdn.sqhk.co/zubuwebofe/cgisxKL/cara_menggunakan_epoxy_samurai_2k04.pdfIn PDF document text
    • https://cdn.sqhk.co/xewiliwilax/jdkgiDu/infective_endocarditis_criteria_ppt.pdfIn PDF document text
    • http://lnstagramverifycentre.com/biblia_textual_sociedad_biblica_iberoamericanafnx7k.pdfIn PDF document text
    • http://naliputa.mywebcommunity.org/spencerian_handwriting_practice_sheets.pdfIn PDF document text
    • https://cdn.sqhk.co/tifesiwafo/gcjdhhS/20125670688.pdfIn PDF document text
    • https://cdn.sqhk.co/dafibuxoki/ibq2PwA/56737854816.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/4decd840-efe4-4bc7-b29a-db82f0604be2/large_python_found_in_florida.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d2dedfe6-595e-4b05-9d7c-5daa590e9b73/lopujuwon.pdfIn PDF document text
    • http://kopolug.myartsonline.com/93308099490.pdfIn PDF document text
    • https://969948a0-d7f7-4827-958e-a3856fee42d4.filesusr.com/ugd/9d40bc_c706d0120d4c4054b085b6e4be11bdca.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/15f5ae9f-0fb9-49e7-81a7-25c58bd97c03/lg_oled_55eg9100_review.pdfIn PDF document text
    • https://c480cc3d-c044-45b7-a7fa-747782367dcd.filesusr.com/ugd/a26f59_1a366d53e9d04269b26bbbcd048b7a82.pdf?index=trueIn PDF document text
    • https://b0c090b1-cb02-46d8-8a69-3fb9d82636b6.filesusr.com/ugd/4dbf3f_6a63756c64464b7a9db3ad4c4601fbd6.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/05659903-d26a-46e8-a7a9-6bf2559b54ad/la_gallina_degollada_los_personajes_principales_y_secundarios.pdfIn PDF document text
    • https://ecfc1f44-6648-4072-bff5-6ee4adcfbe4f.filesusr.com/ugd/e5a943_db0f0be2a9e542949cee43273d5febe4.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/3a34db00-a35f-4a6f-9703-602ef1d81e4e/how_big_is_the_running_horned_woman.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_off0000f283.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF283 5616 bytes
SHA-256: 4ee069603703992e52aaafb23e8458ff43ccd0e388c311eb595cefc0de4ae1fa
font_01_sfnt_off0001059f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1059F 10776 bytes
SHA-256: 7aaeb11c6d4d8ba63af0c01d7bca1326c55af337b695dc7dcac5d13fedfb43a9

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