Malicious PDF — malware analysis report

Static analysis result for SHA-256 fb91108efce30d26…

MALICIOUS

PDF

75.3 KB Created: 2021-03-12 14:43:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 0fbfb34a781a625441571523bd3d0b22 SHA-1: 1068e5d67e9fbaeb8560fa1cfb33dae570d0c2e5 SHA-256: fb91108efce30d26f1fdf9911667057b39fd37b28ae49a7f69e0a78a1d4b1b66
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://jottigo.ru/award?keyword=offensive+security+certified+professional+complete+self+assessment+guide+pdf PDF link annotation
    • http://idealica-tufficiale.website/liwamalubodr6wez.pdfIn PDF document text
    • https://mimudokax.weebly.com/uploads/1/3/4/7/134742140/bovogoli_zemamedokiziwet.pdfIn PDF document text
    • http://bovewitavivebu.getenjoyment.net/oracion_al_espiritu_santo_iglesia_catolica.pdfIn PDF document text
    • http://xiwesesakuvel.medianewsonline.com/15501424178.pdfIn PDF document text
    • http://zuzavepojul.mygamesonline.org/xanado.pdfIn PDF document text
    • https://cdn.sqhk.co/folamudoj/hgdHjjo/kryptek_hydro_dip_film_kit.pdfIn PDF document text
    • https://cdn.sqhk.co/wosuzumamig/ghidxW8/13841393126.pdfIn PDF document text
    • https://losuwigawoje.weebly.com/uploads/1/3/5/3/135304717/nugugobovagof-semev.pdfIn PDF document text
    • http://paksorond.xyz/tipos_de_aplicaciones_informaticas0bdi3.pdfIn PDF document text
    • http://mapotilij.mygamesonline.org/can_you_day_trade_stocks_on_robinhood.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/bb183549-f2ec-4b32-8583-ef94928c49a6/why_does_my_smoke_alarm_flash_red.pdfIn PDF document text
    • http://gevapugono.atwebpages.com/93900400020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0dc4aa2d-1cff-495e-ada5-d3433af0f253/49527550479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/898e660f-04a7-4ef1-b6bc-33418139b70f/kafepowo.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_off0000e8a3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE8A3 5664 bytes
SHA-256: 1bd4432169c6cc4e51b4a0d181d3733040110264fbfe9b69158772deee751afe
font_01_sfnt_off0000fbe6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBE6 10456 bytes
SHA-256: abaafbd41dc8ff28aacd825fb29c3061557478b1540bfcca543ff1dd8d7f5041

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