Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ec30bc1cf263ce2…

MALICIOUS

PDF

73.9 KB Created: 2021-04-30 08:58:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: ec09071932b55846f5eba258637f9cf7 SHA-1: e0c62ce8ad9fba86d805fad242911ab3b4cf756e SHA-256: 8ec30bc1cf263ce2d01e8e1b40d11d483e7ffa301b3531b188b28e4bc7e76066
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 0.9999

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://xajibur.ru/strik?utm_term=public+relations+specialist+education+path PDF link annotation
    • http://hookup158.fun/yeti_microphone_setup_machp7gy.pdfIn PDF document text
    • http://birjand.design/primary_assistant_teacher_exam_question_2020n1kpa.pdfIn PDF document text
    • http://oneshops.space/1332733298dnyje.pdfIn PDF document text
    • http://lavka-karamel.ru/wexuvesawifimexavuk5osxr.pdfIn PDF document text
    • http://heliusdesign.ru/24376941559wvdt4.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4368969/normal_601368c625c46.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4383797/normal_5ff588a52740e.pdfIn PDF document text
    • http://reduslimitaly-ufficiale.site/bocadillos_menunuvig.pdfIn PDF document text
    • http://mexicotop3.xyz/summary_writing_exercises_with_answersy7mro.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4500208/normal_602daeb93d0fb.pdfIn PDF document text
    • http://uber-global.com/lemesenaponus4ed.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://c3e810f9-371e-40b9-9a0b-4695a496ec77.filesusr.com/ugd/2c7c49_b0ac439e6ded41fe825e795ca267d057.pdf?index=trueIn PDF document text
    • https://3465328d-eb21-4af5-a94e-b8fdacefaafa.filesusr.com/ugd/c63bf9_9cf75be530dd472d936198b37637b1cf.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/bac38ca3-db1b-4cf9-8273-bfffc1ce1269/can_microsoft_word_be_on_ipad.pdfIn PDF document text
    • https://2e21b658-2967-4279-8f18-a03590b678a5.filesusr.com/ugd/f5e1b2_49f53cc2b65f4fd282b4d04752b573e1.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/398b3b40-8527-409b-9010-1a215c2de152/how_to_use_a_frozen_margarita_machine.pdfIn PDF document text
    • https://0ecef3a8-5193-4df1-8dcb-1b7dd0f2be2a.filesusr.com/ugd/e6092c_d7ce562f519746108fc32196427fc4a9.pdf?index=trueIn 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_off0000e050.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE050 5300 bytes
SHA-256: 3d88111b6dda3a09c1afcf76386bd8dc918527d69a937d4e96abf020eb6fceca
font_01_sfnt_off0000f241.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF241 11232 bytes
SHA-256: 33ba9a3aa79e93b26a73e928af8a97548c7fec6b18bd32267b30dc657b573a43

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