Malicious PDF — malware analysis report

Static analysis result for SHA-256 51d26cc9eb49525c…

MALICIOUS

PDF

77.9 KB Created: 2021-03-08 18:49:09 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 4d796374fdc2afe6c3dd0154ed39460b SHA-1: 58d60e0ba356c1a651daad778e3c3e47d18bf36a SHA-256: 51d26cc9eb49525c966c96f0c61cfc3e796de2d94fb3009eda9a7e7c846e2be0
186 Risk Score

Malware Insights

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

The PDF contains a large number of external links, many hosted on disposable domains, indicating a link farm or phishing lure. ClamAV and ML classifiers strongly indicate maliciousness. The presence of embedded URLs and the structure suggest the document is designed to redirect users to potentially malicious sites, likely for further exploitation or credential harvesting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://mezovuduw.ru/strik?utm_term=evenflo+embrace+35+pro PDF link annotation
    • http://ideal-it.fun/vubulovakazuwavegafjz10.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4453556/normal_60307a7b524ae.pdfIn PDF document text
    • https://cdn.sqhk.co/tefozakozup/LibYwP0/nosinukuj.pdfIn PDF document text
    • https://cdn.sqhk.co/furafurume/wAge3jb/best_video_player_app_android.pdfIn PDF document text
    • http://naykaryadom.fun/uber_driver_dayton_ohio1kl3q.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4460263/normal_5ff4b0d2e7d49.pdfIn PDF document text
    • https://cdn.sqhk.co/tamejenonisi/CYGjfgh/repexasopuxamozejepo.pdfIn PDF document text
    • https://cdn.sqhk.co/xexegapimuwi/ieOe8TA/18100659076.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366367/normal_603505d2cd2f9.pdfIn PDF document text
    • http://fb-pageunderreview.com/3237756661047cvp.pdfIn PDF document text
    • https://cdn.sqhk.co/gojinuma/ogdsjhH/stickman_army_fps_shooter_stickman_counter_games.pdfIn PDF document text
    • https://cdn.sqhk.co/xekejegixawo/jb4ghgd/94024440809.pdfIn PDF document text
    • http://goodsun.fun/infinity_train_book_3_episode_9lyipw.pdfIn PDF document text
    • https://cdn.sqhk.co/mifijizudi/ahejogc/chart_dragon_type_pokemon_go_list.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4475863/normal_5fe1b9c9d8c1c.pdfIn PDF document text
    • http://mybiol.site/pomemoruvumuxapa77qgy.pdfIn PDF document text
    • https://cdn.sqhk.co/jijasitov/jbhjhfT/ralowolumupisuvezore.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/2921ba18-584e-43d0-8aca-8e08af18f3da/kamawawumaxifepamirugebi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5c5e394c-f25c-424f-b2a6-aef1c835d513/air_force_academy_sat_essay.pdfIn PDF document text
    • https://5a98ae10-8c7e-48da-b83f-9bcbc644cfa3.filesusr.com/ugd/9a8764_99bc9aad872947f5a4b9a01e7b1625fc.pdf?index=trueIn PDF document text
    • https://0926596c-b1e6-4473-87d6-fed2e709bfeb.filesusr.com/ugd/e2a635_db3ddf575b734aec91d9947fcffac2d3.pdf?index=trueIn PDF document text
    • https://uploads.strikinglycdn.com/files/e664dd25-490c-444b-9cca-4781217b4150/61660727371.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_off0000f2de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2DE 5428 bytes
SHA-256: dfa78bd468c30f6c2ed4c51455db2ec532037af8934c0a2403d29e312791fbba
font_01_sfnt_off0001054a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1054A 10944 bytes
SHA-256: abcdf588d45b3467a66b925a9df6cf7edc08ef63a3cc763e4ce18e2f180a6bcf