Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5bf89ef926eb811…

MALICIOUS

PDF

75.8 KB Created: 2021-03-09 15:01:20 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-30
MD5: 2d8419c2cddf732c965434657224b924 SHA-1: a46da637332b10f3db30fc1c848fbb58c97d7e2a SHA-256: e5bf89ef926eb81161dd24513701af37ab17ffdd87139eef1e7bd9cb51a720b4
186 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains a significant number of embedded links pointing to various external websites, many of which are hosted on disposable domains or link farms. The heuristic 'PDF_SEO_LINK_FARM' indicates a mass of external links, and 'ML_NYX_PDF_MALICIOUS' and 'CLAMAV_DETECTION' confirm its malicious nature. The embedded URLs suggest a phishing or SEO spam campaign, aiming to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://vilenefex.ru/strik?utm_term=what+does+pre+op+for+surgery+mean PDF link annotation
    • https://jofusowosa.weebly.com/uploads/1/3/4/7/134764533/16c42b2584dcc72.pdfIn PDF document text
    • http://figebofisekozoj.22web.org/hgv_vehicle_check_sheet_template.pdfIn PDF document text
    • https://zanasebumafuwaj.weebly.com/uploads/1/3/4/8/134899829/nefunirilosixox.pdfIn PDF document text
    • http://fuguzelinufi.22web.org/un_curso_de_milagros_leccin_52.pdfIn PDF document text
    • https://tajezutudod.weebly.com/uploads/1/3/1/3/131398094/kinex-zegedolozi.pdfIn PDF document text
    • http://tekeriset.iblogger.org/article_writing_format_for_class_6.pdfIn PDF document text
    • http://fotodosajube.22web.org/oxford_english_grammar_course_advanced_answer_key.pdfIn PDF document text
    • https://felogenapugiro.weebly.com/uploads/1/3/5/3/135327705/judobajup_nujazimejofo_kapuvi_mudalejos.pdfIn PDF document text
    • https://sunatoruxule.weebly.com/uploads/1/3/4/4/134476105/6c46786fde98.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/eab5e7f1-c2b8-4539-b9b3-0b4648b1f1c6/vawasajotimusugopoferipab.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4a6b7356-99ac-440d-8a85-844163f20381/internal_audit_training_courses_australia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c08b366c-9d6f-4fe1-8701-ca87c7ec8d40/jamevupalufegefavipudaban.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6773967c-d84c-4d2b-9928-0da6dcb4eef5/rainbow_fish_coloring_page_printable.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/82196e16-64f3-48a4-9449-4bf9c68d5f47/2166_cub_cadet_mower_deck_parts.pdfIn PDF document text
    • http://razafif.epizy.com/pufusogosugepomof.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4ef5db97-a02c-4b7a-a0ad-ebe5c6173760/jalin.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/55162510-49d5-4d6d-bc53-cf0cef552be7/how_does_cyberpower_surge_protector_work.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/43a1ac5f-80d2-43c2-9e77-c7d3ef74cf4f/craig_bluetooth_speaker_cma3568_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/57f666b6-66ed-4045-83bd-0e30b67a7d67/mibeweketezimazurul.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbf0d6e1-027e-4b72-9da2-3160ce6e8418/2005_honda_rancher_350_4x4_parts.pdfIn PDF document text
    • http://zoxokukazo.epizy.com/maduronadika.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_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 5540 bytes
SHA-256: b1df36b2e0490adb574da09dade55370958055b4c2c508f9cf0e5066a49b11cf
font_01_sfnt_off0000fb61.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB61 11596 bytes
SHA-256: 604c2ef7c09d9b46b9bf9ee0bdfc18162cb3323c577939f4eaa7c356dd22efd8