Malicious PDF — malware analysis report

Static analysis result for SHA-256 9833a912c3bda6aa…

MALICIOUS

PDF

114.5 KB Created: 2021-04-05 04:42:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 3e998485c1435f4dfe826f8197c01e73 SHA-1: 28f731cf0784cd234b4652a50049d8ec92171a89 SHA-256: 9833a912c3bda6aad1afc645808fbba9d7dbc264db5ee82f5e0671484c92b938
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with at least one pointing to known malicious redirector infrastructure. The heuristic firings indicate this PDF is designed to redirect users, likely for phishing or to download further malicious content. The presence of a 'download button' lure reinforces this malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9994

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
  • 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://yafferge.ru/strik?utm_term=roomba+980+black+friday+deals+2019 In PDF document text
    • https://cdn.sqhk.co/rujiwujik/HgcDgda/46298291636.pdfIn PDF document text
    • http://tiketaxi.iblogger.org/singer_fashion_mate_7256_bobbin_threading.pdfIn PDF document text
    • https://cdn.sqhk.co/mosugukasiba/pW5FghB/uae_exchange_online_transfer_customer_care.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4426701/normal_5ff5ec1b69e60.pdfIn PDF document text
    • http://vikidavilor.22web.org/chanel_brand_guidelines.pdfIn PDF document text
    • http://meboxofunufox.iblogger.org/jolly_phonics_letter_c_worksheet.pdfIn PDF document text
    • http://byseles.xyz/arulnithi_all_songss4oe9.pdfIn PDF document text
    • http://lixixivukagoda.66ghz.com/bemalarujavojamafadof.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4402949/normal_5fd8987f09519.pdfIn PDF document text
    • http://upgrade4me.com/40127332907f76cy.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391893/normal_6005dd101f37d.pdfIn PDF document text
    • https://cdn.sqhk.co/tunixomaj/fhfwMXb/dremel_scroll_saw_1672_manual.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379234/normal_6026cd7be3c2b.pdfIn PDF document text
    • https://cdn.sqhk.co/potiribuwuf/yIwuiaf/87444621425.pdfIn PDF document text
    • http://nnorm-id.com/logo_design_png_templaten0u7b.pdfIn PDF document text
    • http://mebets.xyz/xulorakipubasogamqnls.pdfIn PDF document text
    • https://cdn.sqhk.co/kagumuzom/MwSticc/best_redbubble_posters.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/fae5c630-2a70-4178-a78a-d2a54d3e5238/ritedome.pdfIn PDF document text
    • http://pimapejenila.epizy.com/les_energies_renouvelables_en_tunisie.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/aa160ecb-fb32-4008-a6a8-1d496312f7f4/english_learning_games_for_esl_students.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e876fa7-2ab3-4aa4-bc7f-13dabe797840/91196779257.pdfIn PDF document text
    • http://diwulabasiluxe.epizy.com/indian_instant_pot_cookbook_recipes.pdfIn PDF document text
    • http://suvejozuwedur.epizy.com/cultura_atacamea.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_off00017d76.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x17D76 6156 bytes
SHA-256: 1dd4826b616cd0fc59c580e9cc7f349015757bfff58d296caec8957e3496dd9c
font_01_sfnt_off00019258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x19258 12352 bytes
SHA-256: 8f998221b1a3ed6d9aa3580970e3c47eae9676cea22ab11db8183a71545b011d