Malicious PDF — malware analysis report

Static analysis result for SHA-256 6ee1eb45293fad4a…

MALICIOUS

PDF

75.4 KB Created: 2021-06-06 21:47:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 654466effe5a5d6d928391763e9785e1 SHA-1: 775ed8bc8c8bde4fc78ebad6664bd655153709cd SHA-256: 6ee1eb45293fad4af7dbbd8115b46c089e4910896e70441fc62b59c4430f4ae3
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 0.9992

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://synerhu.ru/pbw?utm_term=livro+tratado+de+pediatria+nelson+pdf PDF link annotation
    • https://fubomagasikeka.weebly.com/uploads/1/3/4/4/134474343/26e83e148ad.pdfIn PDF document text
    • https://luzepomi.weebly.com/uploads/1/3/1/8/131856518/pevawi-vikimedosonunew-taraduxugujexid.pdfIn PDF document text
    • https://jaligudupu.weebly.com/uploads/1/3/5/3/135391073/5891352.pdfIn PDF document text
    • https://jemusutagutuf.weebly.com/uploads/1/3/5/3/135390091/a58ef487fe.pdfIn PDF document text
    • https://rodekimixew.weebly.com/uploads/1/3/4/3/134314341/kavutiruperexu.pdfIn PDF document text
    • https://fowowudajij.weebly.com/uploads/1/3/5/3/135312379/babiti.pdfIn PDF document text
    • https://negiwonilelif.weebly.com/uploads/1/3/4/5/134583179/335513.pdfIn PDF document text
    • https://fidejilajusaxe.weebly.com/uploads/1/3/4/3/134363993/1343d7eb.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/9d9d6ae5-dbfe-4c16-9bf3-7fab10bcd0e4/cuales_son_los_tipos_de_archivos.pdfIn PDF document text
    • http://kekirow.pbworks.com/f/2007_yamaha_v_star_1100_service_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2a1b382d-a31c-4ad7-bc7f-76b4a3a2880f/plantronics_bluetooth_headset_voyager_legend_uc_b235-m_usb.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/341d6bef-436c-4555-a25d-ea255c6b00a2/korean_hangul_chart_pronunciation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09437634-ab6e-44b6-bebb-e80155b52ec6/depatinitirunifanidopafed.pdfIn PDF document text
    • http://namikikis.pbworks.com/f/lufomavadopu.pdfIn PDF document text
    • http://tisowowuduwe.pbworks.com/f/rangers_apprentice_book_13_free_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/d8d3e248-4e93-4275-8896-915e2146e5bc/myers_briggs_types_letters.pdfIn PDF document text
    • http://devopiporo.pbworks.com/f/hp_laserjet_1320_pcl_6_driver_windows_7_64_bit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/68d43d09-fb88-4402-9f5a-cbb9be4b810c/craftsman_30_inch_riding_mower_drive_belt_replacement.pdfIn PDF document text
    • http://subazim.pbworks.com/w/file/fetch/144547797/la_la_land_streaming_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/12a61e64-a2b1-419f-8451-f57eaafe526a/do_all_jeeps_have_transmission_problems.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/353b8335-e1ed-4bfe-b3a7-821779494551/how_old_is_internet.pdfIn PDF document text
    • http://vugufosenene.pbworks.com/f/holt_mcdougal_literature_grade_8_answers.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7771037b-bbaa-4693-b6f5-465a0b5b940c/jovudet.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_off0000e6cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6CB 5036 bytes
SHA-256: 269878ac3c996f869ded9328389e877df1619324810d83101423aca10f13f09a
font_01_sfnt_off0000f808.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF808 12656 bytes
SHA-256: d05179d5d5bebbb1c2d4b45c7b17dc40af9f6de6b11d7f338ed7aab06a05c910