Malicious PDF — malware analysis report

Static analysis result for SHA-256 b4b7e235f01bfc7b…

MALICIOUS

PDF

80.2 KB Created: 2021-03-09 21:05:55 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 669e2113dd2f153e1ac2fbca5e0493ec SHA-1: 821247f5c5aafe98f03e7cd8807bd718cd713ee8 SHA-256: b4b7e235f01bfc7b5f8d876eeca61780efd25e7b25069ded637b2389000b8ce8
66 Risk Score

Malware Insights

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

The PDF document is flagged as malicious by an ML classifier and contains numerous embedded URLs, one of which points to a domain associated with link farming and disposable hosting. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest an attempt to redirect users to malicious content, likely as part of a phishing or scam campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 4

  • 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://kuzutuzo.ru/award?keyword=alimentos+permitidos+para+diabeticos+e+hipertensos+pdf PDF link annotation
    • https://cdn.sqhk.co/rowibimibopi/gjaihif/platform_games_scratch_coding.pdfIn PDF document text
    • https://xuwupeloz.weebly.com/uploads/1/3/4/7/134734270/6840483.pdfIn PDF document text
    • https://warevinigipa.weebly.com/uploads/1/3/4/8/134898994/ditubepudimuzogeli.pdfIn PDF document text
    • https://cdn.sqhk.co/xinefegepe/dYhcFhj/54319509337.pdfIn PDF document text
    • https://cdn.sqhk.co/jezaziritav/F6E0hgj/56908254296.pdfIn PDF document text
    • https://cdn.sqhk.co/sojowidaz/jchf1ie/toy_warrior_full_movie_in_english.pdfIn PDF document text
    • http://sowopezamiw.medianewsonline.com/nadodolexuriwib.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/Ziaicgj/76689743556.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/napoledunadigo/development_economics_debraj_ray_ebook.pdfIn PDF document text
    • https://s3.amazonaws.com/fifomi/30156002515.pdfIn PDF document text
    • https://s3.amazonaws.com/vutame/12060759947.pdfIn PDF document text
    • http://zewuref.rf.gd/84286912148.pdfIn PDF document text
    • http://limixumijegaf.epizy.com/lolopezisufi.pdfIn PDF document text
    • https://s3.amazonaws.com/supefujoxopubu/bemegoxuke.pdfIn PDF document text
    • https://s3.amazonaws.com/nopomewegobij/19946961449.pdfIn PDF document text
    • http://bafuwujix.atwebpages.com/thirteen_reasons_why_season_3_episode_13_songs.pdfIn PDF document text
    • https://s3.amazonaws.com/kabisebax/moog_sub_37_manuale_italiano.pdfIn PDF document text
    • http://vibirokudod.myartsonline.com/kenmore_116_vacuum_disassembly.pdfIn PDF document text
    • http://nubibubimalepik.atwebpages.com/89027474764.pdfIn PDF document text
    • http://pexirud.onlinewebshop.net/hvac_test_questions_and_answers.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_off0000f9a8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9A8 5524 bytes
SHA-256: 7e5367dc346c8b338e253e3103e381bfb0e6117d488afd27d5ea3dfe2e4d2d66
font_01_sfnt_off00010c43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10C43 11676 bytes
SHA-256: b8c325e6904f74ae06cb8f8545fd0fbefde7a39ddca5adb0aea246e0173b3ab8

Open this report in the interactive analyzer, or submit your own file for analysis.