Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b1f92de089bef2d…

MALICIOUS

PDF

73.4 KB Created: 2021-03-08 18:50:10 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: ad7ad623730428660d755d833e47c7ca SHA-1: c1957c0991dacfbebe2787cd85109ac09f5a15c4 SHA-256: 2b1f92de089bef2d1bc8ea4f12d1d111770b3a658d87daa9bdbf025ef1d39b57
192 Risk Score

Malware Insights

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

The PDF contains numerous embedded links that redirect to disposable hosting, indicating a link farm designed to obscure malicious destinations. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or malware distribution. While no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious redirection workflow.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://dafemum.ru/123?utm_term=post+office+guide+blackburn In PDF document text
    • https://cdn.sqhk.co/satidaruxami/djaiaP3/empire_tv_tycoon_free_download.pdfIn PDF document text
    • http://zodimasar.mypressonline.com/how_do_i_find_a_dbt_therapist.pdfIn PDF document text
    • https://besugadofozoxi.weebly.com/uploads/1/3/5/3/135396803/sowalivoma.pdfIn PDF document text
    • https://rajidekexosixi.weebly.com/uploads/1/3/0/7/130738830/455229.pdfIn PDF document text
    • https://fupozivu.weebly.com/uploads/1/3/5/3/135316658/7388336.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4388177/normal_60248c58dbc8b.pdfIn PDF document text
    • https://rolowuwojudazap.weebly.com/uploads/1/3/5/3/135302881/gupusotowav.pdfIn PDF document text
    • https://cdn.sqhk.co/pixafosabow/cgggjjc/cartographers_board_game_app.pdfIn PDF document text
    • https://cdn.sqhk.co/pozedezupase/hdijcEh/rocket_launcher_liners.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4371014/normal_5ff95059ecf41.pdfIn PDF document text
    • http://nanebaxexob.getenjoyment.net/notegilumazivuboge.pdfIn PDF document text
    • http://lezeninimi.medianewsonline.com/identify_the_statements_below_which_summarize_what_cash_discounts_are._check_all_that_apply.pdfIn PDF document text
    • https://lulotabo.weebly.com/uploads/1/3/4/7/134745182/jeduseko_zawelipuxuzo.pdfIn PDF document text
    • https://cdn.sqhk.co/mixaluwekitu/AhbNiee/88999166672.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/4081642c-ac5e-46b9-bb1a-186e08176577/xikivubowefesowagafewelu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/575b825d-c16d-46ae-a3db-537bbc160e8f/harry_potter_quizzes_pottermore.pdfIn PDF document text
    • http://vedixemalirugi.atwebpages.com/vazopuwunobu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/918f1274-8f35-4d05-8e40-b13d4e50f8fc/13042010976.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/69d712a2-9cfe-4ff2-b57f-a0861d1d675d/botawimuxuzubujaf.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/de2bc6ed-746c-4f9e-8b4f-caf5b7452414/the_secret_history_of_wonder_woman_book_club_questions.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_off0000e319.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE319 5396 bytes
SHA-256: 7e2904987198b1bdfd51507808910cdd3f057c37b4f6f91f261ab0cc4bbcd08c
font_01_sfnt_off0000f585.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF585 10256 bytes
SHA-256: 44818fef1e2ac3be81afebb1d4c7155a15f88c773a49186b5c5dc41b5849bd30