Malicious PDF — malware analysis report

Static analysis result for SHA-256 a80b082ed5d32c87…

MALICIOUS

PDF

71.1 KB Created: 2021-06-04 17:14:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 31d3978e9f773fce5b6839e4d6bfe647 SHA-1: 13ada66e20010f6722ddc4cf1e9b1a3ccceffe45 SHA-256: a80b082ed5d32c87e9f96b32099eee58544792ed95249b4529ead6e6f91a4534
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

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 5

  • 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 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://crysiq.ru/pbw?utm_term=how+to+do+back+handspring+for+beginners+at+home PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4426549/normal_602bb39f94896.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495392/normal_60401786bb9de.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4487894/normal_606c2cb5d01c0.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wudiwiligis.pbworks.com/w/file/fetch/144546900/99044118622.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ea3ed4a-2cc1-499b-919a-39cf37911eb1/kinetico_water_softener_iron_filter.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/70814c7d-742b-42b5-9799-b638328aa79f/dungeons_and_dragons_storm_kings_thunder.pdfIn PDF document text
    • http://poxanoralanu.pbworks.com/f/gusizageto.pdfIn PDF document text
    • http://fuvesiwowegu.pbworks.com/f/memikitofuruwezun.pdfIn PDF document text
    • http://runaliguredu.pbworks.com/f/karekk_tyt_matematik_deneme_zmleri.pdfIn PDF document text
    • http://nuxawakaxaz.pbworks.com/w/file/fetch/144573216/bazifaxusokinujamopopadud.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58dbc48e-9a61-4c03-96eb-6e9a8f291580/dogevigipuxiwagenip.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/230d686b-7724-4170-bd46-7dcb5b149fe3/how_to_turn_off_demo_mode_on_samsung_microwave.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b38a535f-8f23-4743-a42d-3f73bf95eb2c/where_to_practice_survival_skills.pdfIn PDF document text
    • http://wojoxevom.pbworks.com/f/esl_conversation_lessons.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a61a1d49-7130-411c-999c-bc09e1792a7a/xenilosavuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0302d45d-2928-45b0-9f02-bb4430b961da/integrated_chinese_4th_edition_volume_2_textbook.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/476f9659-cc3a-4af4-823e-321da1964f96/free_life_coaching_exercises.pdfIn PDF document text
    • http://zekodunu.pbworks.com/f/xesutajem.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ab8e7e01-1491-4b7b-8a1a-eb028bc94d3b/what_are_the_features_of_good_academic_writing.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_off0000d87d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD87D 5792 bytes
SHA-256: 0dbbfe1cd5e46cdc2ca923dd554045837271d2574dccb4c5facf6b2f225a2f0d
font_01_sfnt_off0000ec1f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC1F 10188 bytes
SHA-256: 878d344ed986a1aab5abc7672138662e25633ae10673aec5278f629208926c23

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