Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6de4fe0804091aa…

MALICIOUS

PDF

78.3 KB Created: 2021-06-08 01:16:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-25
MD5: 6f7307aeb500a221ae764131caf2b4f2 SHA-1: 0ae4c4ad2d0ac278fe829563f5375062727a9052 SHA-256: b6de4fe0804091aa7cb1fa181261ca70db1ef8ea0be7a4350f31d541c16cd032
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9961

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://resalured.ru/123?utm_term=comparative+balance+sheet+calculator PDF link annotation
    • https://rilokudewagozem.weebly.com/uploads/1/3/4/5/134597993/622ba94e.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4481988/normal_60431a9574b3e.pdfIn PDF document text
    • https://xojuliwujugiseb.weebly.com/uploads/1/3/4/3/134388488/8d8aac6f7c7b13.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4489032/normal_60404a126fbb4.pdfIn PDF document text
    • https://bururinuriz.weebly.com/uploads/1/3/4/8/134882015/99e050377e064e.pdfIn PDF document text
    • https://fipuzogafugigen.weebly.com/uploads/1/3/4/1/134108551/f208db1d1f.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419826/normal_60101331c1ce7.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://funesut.pbworks.com/w/file/fetch/144559209/the_theme_of_the_raven_by_edgar_allen_poe.pdfIn PDF document text
    • http://tezalef.pbworks.com/f/bubble_shooter_mod_apk_unlimited.pdfIn PDF document text
    • http://kibumezi.pbworks.com/w/file/fetch/144468207/staar_practice_reading_passages_4th_grade.pdfIn PDF document text
    • http://dekokos.pbworks.com/w/file/fetch/144424455/github_bypass_paywall_android.pdfIn PDF document text
    • http://tazijebep.pbworks.com/f/best_buy_return_policy_without_receipt_gift.pdfIn PDF document text
    • http://mefijunov.pbworks.com/w/file/fetch/144557892/jivizofoxelesizedame.pdfIn PDF document text
    • http://rorazokazog.pbworks.com/w/file/fetch/144495447/receptor_brasilsat_digital_plus_s2200_manual.pdfIn PDF document text
    • http://bupataved.pbworks.com/f/47321866639.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/17c00fb9-8d8a-4672-a6d1-2e52d0442ffe/que_fecha_es_el_domingo_de_ramos_2020.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95e4b474-5717-4b60-8bbf-de5dcac035af/aladdin_story_book_in_hindi.pdfIn PDF document text
    • http://xuruzinijub.pbworks.com/w/file/fetch/144423576/exercicios_concordancia_verbal_e_nominal_concursos.pdfIn PDF document text
    • http://sinorodolu.pbworks.com/f/chudi_jo_khanki_haathon_mein_dj_mp3_song_free_download.pdfIn PDF document text
    • http://voveras.pbworks.com/f/10915336193.pdfIn PDF document text
    • http://fogofalo.pbworks.com/f/ib_history_hl_syllabus.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/fc678d18-0759-4b18-9288-b44ffc9a8337/mimijidekovelebiz.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/dbe63a42-100c-489c-b2a7-dc3378e28051/zoom_video_conferencing_guidelines.pdfIn PDF document text
    • http://moxulolo.pbworks.com/f/ninne_chudanu_pommantu_kannulu_musi_kurchunna_mp3_songs_download_telugu.pdfIn PDF document text
    • http://lewiwebula.pbworks.com/w/file/fetch/144752292/fasusamik.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/394f8cfa-e267-4fe6-998e-fbf8c5da3177/do_i_complain_too_much_quiz.pdfIn PDF document text
    • http://nagaxop.pbworks.com/f/what_are_the_crystalline_allotropes_of_carbon.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_off0000f4e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4E9 5276 bytes
SHA-256: 1966089630b21c41cbef9829367453d6833f78d862f490e397291f34f6189915
font_01_sfnt_off000106a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x106A7 10752 bytes
SHA-256: 9c540fde8e69137736a7b3156d1824392f70f143f5274afee2b605e255c13166