Malicious PDF — malware analysis report

Static analysis result for SHA-256 3dd0437a24e0429b…

MALICIOUS

PDF

85.2 KB Created: 2021-05-31 13:13:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-23
MD5: e93465aa098d547b5d3da8ca00cb7954 SHA-1: ecff343681481acd23c5ca301996b26168d02129 SHA-256: 3dd0437a24e0429b9d09ad94fb9a3a011cd75c217331473b39582eac27c398ac
186 Risk Score

Malware Insights

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

The PDF contains numerous external links, many pointing to disposable hosting and employing UTM parameters, indicative of a link farm or phishing campaign. The ML classifier and ClamAV detection strongly suggest malicious intent, likely related to phishing or malware delivery. While no scripts were explicitly extracted, the PDF structure and embedded links are designed to redirect users to potentially harmful sites.

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=is+sulfur+hexafluoride+ionic+or+molecular PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4389821/normal_5fda321269a86.pdfIn PDF document text
    • https://sajipetifejej.weebly.com/uploads/1/3/4/8/134883768/tejivojufukodunala.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4379744/normal_5ff9355b13365.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4480594/normal_5ffd72e22ae23.pdfIn PDF document text
    • https://rowimibakerideb.weebly.com/uploads/1/3/4/4/134494798/ronisiwalasagoxuwa.pdfIn PDF document text
    • https://tujigagozevako.weebly.com/uploads/1/3/4/2/134266307/8822617.pdfIn PDF document text
    • https://kagunalikabogow.weebly.com/uploads/1/3/5/3/135350350/978e2fde9f9.pdfIn PDF document text
    • https://guxilidokuwog.weebly.com/uploads/1/3/0/7/130738661/tofunokovop.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://uploads.strikinglycdn.com/files/5a195bb6-c1c1-4af2-936d-86b045e18418/salesforce_marketing_cloud_consultant_certification_code.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8604fc2c-5ee4-4914-afb8-894db6203c2c/how_many_miracles_jesus_did_in_the_bible.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/99d91f0d-bddb-452d-9930-6eec43c873f6/booster_pac_es5000_charging_time.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bbd126d-c3e3-4774-ab68-1a93dd9cb332/que_es_ser_un_lider_para_nios.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b9a4c87b-cb08-4833-bf4b-74b0050bc528/what_is_the_process_of_strategy_formulation.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/efb78269-0db1-4009-bb24-8afab56bf355/rejigukefalit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3752bcaf-b44f-4e77-ae1a-6d2d80a567f4/how_much_do_hedge_fund_managers_make_in_india.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3e123ad1-232c-47a6-81b2-790a19a3a88e/writing_linear_functions_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ebf771e0-51e3-4c64-84af-041251bb1cbf/theodor_w._adorno_minima_moralia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/7384316c-c121-4808-9695-2421a6c40c21/pencil_drawing_techniques.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/370b03d1-d5ba-4da3-b88d-83b8f3c3636a/ana_scope_and_standards_of_practice_for_public_health_nursing.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/52eac902-6f20-49f6-842f-876747f70fc9/blue_yeti_pro_usb_microphone_review.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8bab63ef-2175-49a5-9beb-04cd58225f34/c_programming_language_questions_in_interviews.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000103d6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x103D6 5068 bytes
SHA-256: 8068875670a0931a7a16c61effebef090394d0918b1808e4cb69d1e77774d72a
font_01_sfnt_off000114d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114D2 10556 bytes
SHA-256: e4e697395f999d65505b6ff6efb61a3fa0c6a18c379ab73883e5cfefd49e4f81
font_02_sfnt_off000138ee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x138EE 4324 bytes
SHA-256: a542ec26cea93e049a2e27cd59b1347dd9bbdea13775fd7b822b3c2b3136116f