Malicious PDF — malware analysis report

Static analysis result for SHA-256 1099d110e3da2021…

MALICIOUS

PDF

85.3 KB Created: 2021-03-23 00:44:59 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 25f00433432993e1dc5b0c05e227a61d SHA-1: 94fbe97419865874ddac4cc50b764315cbb0ae6a SHA-256: 1099d110e3da2021689a6eb18b2ea55eac01822e3b915eed07a7c511b73e55ca
186 Risk Score

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 0.9998

Heuristics 6

  • 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 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.
  • 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://jottigo.ru/award?keyword=ciencia+definicion+pdf PDF link annotation
    • http://digitaltoolsfor.xyz/relion_blood_pressure_cuff_accuracyywla6.pdfIn PDF document text
    • http://perfectiona.online/dimapimewepamitabixadumuvx2uk.pdfIn PDF document text
    • http://gunofixe.medianewsonline.com/tecnologia_da_informatica.pdfIn PDF document text
    • https://cdn.sqhk.co/fepexeguma/ideiigh/marketing_manager_weekly_report_template.pdfIn PDF document text
    • https://cdn.sqhk.co/subetudagoli/hXtjdhB/chores_meaning_in_spanish.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/Zjgjggd/83666186999.pdfIn PDF document text
    • http://leree6.club/dermatophytes_definitionjivou.pdfIn PDF document text
    • https://cdn.sqhk.co/kelarega/ij6ighD/music_rocky_4_training.pdfIn PDF document text
    • http://gipogup.sportsontheweb.net/james_baldwin_collected_essays_paperback.pdfIn PDF document text
    • https://cdn.sqhk.co/biposuba/KIjejgj/traxxas_link_app_not_working.pdfIn PDF document text
    • http://nujinedopidil.iblogger.org/sewoluropemebewub.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://pejezal.rf.gd/unchained_melody_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/paulo_coelho_libros_once_minutos.pdfIn PDF document text
    • https://c8ff5639-09d9-4535-8c68-e7569a30476d.filesusr.com/ugd/0bcf16_f94ab5bec6f24e6395c9680d01f2445f.pdf?index=trueIn PDF document text
    • https://680e7e7f-99bb-4309-8a01-ecc910dc7690.filesusr.com/ugd/717a42_af1e74b0b21a4774a0588e1dc2f54487.pdf?index=trueIn PDF document text
    • http://xarujubapemir.epizy.com/xiporo.pdfIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/daddy_by_sylvia_plath_feminist_criticism.pdfIn PDF document text
    • https://s3.amazonaws.com/jenagubadopi/peavey_classic_50_4x10.pdfIn PDF document text
    • http://xazerusovugidu.epizy.com/dolmar_chainsaw_chain_guide.pdfIn PDF document text
    • https://0aed7b51-d02b-4864-a6bb-b478bb809667.filesusr.com/ugd/fbdaab_31367adc4d4e454da70f9cc4d9a47825.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_off00010e89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E89 4748 bytes
SHA-256: 896d2ff8c7269e690ae5472119d2971bd0c2f94dfe81fd347ad93ee0355ed09b
font_01_sfnt_off00011eca.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11ECA 12416 bytes
SHA-256: be82e27cea9bde228f8c99f3a92fbd70e73baa03ca8fdb9361fc96701b8f8bfb

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