Malicious PDF — malware analysis report

Static analysis result for SHA-256 f6dc909ac1320a4d…

MALICIOUS

PDF

75.7 KB Created: 2021-02-28 01:05:26 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-12
MD5: 571f75559240e83df1ce0b991bb6a553 SHA-1: 19b641ec2d9c8363d2358900512331672e24fbf0 SHA-256: f6dc909ac1320a4d4fe953b4b4525a464b14c53208b3b24e537e936d16d37726
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of creating numerous links on disposable hosting, suggesting an attempt to distribute malware or phish users. While no scripts were explicitly extracted, the PDF structure and numerous external links strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • 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 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://xajibur.ru/award?keyword=how+are+organisms+classified+class+7 PDF link annotation
    • http://ganitigusawev.mygamesonline.org/minecraft_survival_servers_ip_1.16.2.pdfIn PDF document text
    • http://robugipunebib.mygamesonline.org/will_power_book_2_ghost_have_a_season_2.pdfIn PDF document text
    • https://cdn.sqhk.co/levowexesu/j5qhpLd/naxit.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4446380/normal_5fd3d780701ca.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4413866/normal_5fe4610fcb56c.pdfIn PDF document text
    • https://cdn.sqhk.co/powirafawume/evificj/funny_video_download_whatsapp_status_share_chat.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/Ghbjgdf/royalty_free_music_free_download_background_music.pdfIn PDF document text
    • https://cdn.sqhk.co/lituxopevuk/HKid2he/55010235756.pdfIn PDF document text
    • http://rosutob.getenjoyment.net/the_dark_tower_harlem.pdfIn PDF document text
    • http://zavarivaemvmeste.ru/archero_mod_apk_iphonej1jka.pdfIn PDF document text
    • http://tofotibuwul.sportsontheweb.net/pharmacology_made_insanely_easy_barnes_and_noble.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495400/normal_6011b089d3819.pdfIn PDF document text
    • https://cdn.sqhk.co/xaripisi/dmejiCi/reforelelanisexibi.pdfIn PDF document text
    • http://mushygushysayings.com/946999769037bb7u.pdfIn PDF document text
    • http://kuvenumine.mygamesonline.org/janekofo.pdfIn PDF document text
    • http://findfreegirl.com/night_owl_security_cameras_setupko35m.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426974/normal_5fd0640c96e10.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://lobopekogolo.onlinewebshop.net/corsair_cx750m_cable_compatibility.pdfIn PDF document text
    • http://rodedewezijore.atwebpages.com/1999_international_4700_dt466_specs.pdfIn PDF document text
    • http://nerezusilanake.atwebpages.com/bedford_book_of_genres_chapter_2.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_off0000ec7f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC7F 5472 bytes
SHA-256: 3cfef05de8293be45ffc60e05180940028a3c03c908b9b37cbe27e9ceaef1531
font_01_sfnt_off0000ff1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF1E 9964 bytes
SHA-256: 52bc1c35c8f0e695acb272c8d319e1ae71f993d6cebf503794249643c27c8c20

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