Malicious PDF — malware analysis report

Static analysis result for SHA-256 d16c243043f21622…

MALICIOUS

PDF

79.8 KB Created: 2021-05-13 16:45:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 090ee94c87e9a555e81698c25839ae31 SHA-1: d3da3365d80ec0e9631fd988c4d1bf6d09f792c3 SHA-256: d16c243043f21622b58242fc7d327222f0a6ef73d56d8c08746907c0db6b0718
126 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The document contains numerous embedded URLs, with one prominent URL pointing to 'seumenha.ru' and containing a 'bunker hill security system' query parameter, suggesting a lure. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further indicates that the PDF is designed to host many links on disposable domains, reinforcing the phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9993

Heuristics 5

  • 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 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://seumenha.ru/strik?utm_term=bunker+hill+security+system+62368 PDF link annotation
    • http://argo-tourism.com/351179195979mf28.pdfIn PDF document text
    • https://cdn.sqhk.co/dexasubu/iagjngd/sokarabedaxop.pdfIn PDF document text
    • https://cdn.sqhk.co/digatamale/dheiihj/62727915759.pdfIn PDF document text
    • http://familyit.pro/aligning_text_fields_in_forms_htmlnnljh.pdfIn PDF document text
    • https://cdn.sqhk.co/garisuvonuk/gcLyieC/bubble_wing_butterfly.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4407986/normal_604aef624e8af.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4445729/normal_603918ca8dedd.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4448137/normal_5fe9a80461ef8.pdfIn PDF document text
    • http://instapriz365.online/samsung_bd-j5100_remote_not_working1c9ce.pdfIn PDF document text
    • http://trokot-online.xyz/arithmetic_progression_questions_and_answers_class_10i1b4n.pdfIn PDF document text
    • http://lifeit.pro/the_maze_runner_2014_movie_download_in_hindi_720p_worldfree4u18k0m.pdfIn PDF document text
    • https://cdn.sqhk.co/tinolaseja/ce8hdu2/fresh_cod_recipes_healthy.pdfIn PDF document text
    • http://nuverlites.online/does_utah_look_at_weighted_gpacep7d.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4391602/normal_5ff9db3bcd3a5.pdfIn PDF document text
    • https://cdn.sqhk.co/xejudawadoni/ijgfijz/hat_trick_century_in_test_cricket_bangladesh.pdfIn PDF document text
    • https://cdn.sqhk.co/rizonozugaj/WjgjbhB/57745601417.pdfIn PDF document text
    • https://cdn.sqhk.co/nalomuxe/gep3nii/noticias_telemundo_today_youtube.pdfIn PDF document text
    • http://uscreditscore.info/ariston_dishwasher_manual_lfc2c19pcya0.pdfIn PDF document text
    • https://cdn.sqhk.co/zurefaxenov/FhViehc/yellowstone_cast_tater_jen_landon.pdfIn PDF document text
    • http://2220202.ru/56499323181nj90o.pdfIn PDF document text
    • http://hopecommunitynaz.com/car_battery_charger_circuits_diagramszvhbo.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/e3378f59-b983-4cd0-83d6-ef438dfb3bd4/what_comes_after_3_8.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1203ddf8-3a91-4d67-81b8-b558e5c88811/fejadak.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/88246a3a-24b4-45be-9774-46632618b0fb/wasuvuvidowovax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1df997bc-2804-4f51-90eb-3e0117d932f2/895890450.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_off0000fd34.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD34 5688 bytes
SHA-256: 65511748bf6a1821d522a4e710446f9fc4d7d523a5ee83a5fe6e806544566542
font_01_sfnt_off00011073.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11073 9756 bytes
SHA-256: 8edbec47aa1cae595667d085ddf5cbd5142eaa3a27db2b211e15d602f65c03a2