Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8bf7b6926819a2f…

MALICIOUS

PDF

86.3 KB Created: 2021-02-16 19:41:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 4e15195f6759fdf270a730bb9cb3b6b9 SHA-1: 422f98669608c46f193b437d3b407f207fcb41f4 SHA-256: e8bf7b6926819a2fdf3950b6562220b5b8b1ca1876d116c1312fc05373fc8e04
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs pointing to various domains, many of which are associated with link farms and potentially malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • 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 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://bologen.ru/wix?keyword=slimera+garcinia+cambogia PDF link annotation
    • http://monubaz.iblogger.org/commodities_income_guidelines.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4476756/normal_5fe71716510ea.pdfIn PDF document text
    • http://kigazuvunawolux.iblogger.org/bogan_video_songs_5starmusiq.pdfIn PDF document text
    • http://55571.ru/descargar_coraline_y_la_puerta_secrecwlbz.pdfIn PDF document text
    • http://lefenup.22web.org/dafokuvowokateg.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4473890/normal_5fe77dc968a69.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://zajepatexesa.epizy.com/chaos_magic_star_tattoo.pdfIn PDF document text
    • http://xewewiwuxadul.rf.gd/book_of_dragons_full_movie.pdfIn PDF document text
    • http://lekipidupi.rf.gd/89191714731.pdfIn PDF document text
    • http://pepebejawu.epizy.com/dragon_ball_gt_abertura_japones.pdfIn PDF document text
    • http://fapibudu.epizy.com/jubufoz.pdfIn PDF document text
    • https://s3.amazonaws.com/tumuzu/orpheus_in_the_underworld_sheet_music.pdfIn PDF document text
    • http://vitijumixanuzit.epizy.com/21131916745.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_off0001152f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1152F 5184 bytes
SHA-256: c3d0c076679acfaeea1f064512c0e78c4d2313675abb7017ff8ac4b9961ae91e
font_01_sfnt_off000126bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x126BC 10932 bytes
SHA-256: 526fc4cf03e221e45b61f8815042795560005f1a498ba56cc86bcf2a76a96d9d

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