Malicious PDF — malware analysis report

Static analysis result for SHA-256 e900892a4416d403…

MALICIOUS

PDF

78.1 KB Created: 2021-06-06 07:24:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 542b8d06e62803f3621a6a4f696d014f SHA-1: b656cd2aab1d057137c1a50ddc735cc7b1d4c02d SHA-256: e900892a4416d403244a6c000d09288b5e0a96d92165d3f6fa40391ee42f08a3
186 Risk Score

Malware Insights

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

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 0.9990

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://seumenha.ru/123?utm_term=bubble+trouble+2+free++for+pc PDF link annotation
    • https://razotipelemato.weebly.com/uploads/1/3/0/7/130738732/ab376.pdfIn PDF document text
    • https://jodakinikap.weebly.com/uploads/1/3/4/3/134375895/xiloloxokevesu-bexorowu.pdfIn PDF document text
    • https://saremugofu.weebly.com/uploads/1/3/4/0/134017097/4315559.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
    • http://katafuzum.pbworks.com/f/voice_recorder_app_pc.pdfIn PDF document text
    • http://sodopateduke.pbworks.com/w/file/fetch/144426267/muginaderomififuse.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/42b1efd1-d9cc-4267-be96-3b2e03bef1e8/how_to_make_screen_size_smaller_on_macbook.pdfIn PDF document text
    • http://visetululiv.pbworks.com/w/file/fetch/144423243/55649579015.pdfIn PDF document text
    • http://lugozamuxika.pbworks.com/w/file/fetch/144416094/monisaw.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cad41f26-b221-4b30-a90b-edff41a331a1/rakalujemu.pdfIn PDF document text
    • http://foxobekizax.pbworks.com/w/file/fetch/144435924/pifarituvejeduku.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/95f0be8d-b382-4adb-a02b-0cf55ae0c5de/tigelifakag.pdfIn PDF document text
    • http://risoxef.pbworks.com/w/file/fetch/144455130/fexukuzigomopapuzedug.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/5e8c34da-266f-4482-b575-d80fe76877b8/snapper_riding_mower_maintenance.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/66647b3a-301c-4e06-9ebc-fdc1955ec89c/howard_miller_clock_service_center.pdfIn PDF document text
    • http://wuvebag.pbworks.com/w/file/fetch/144425001/riddle_worksheets_for_5th_grade.pdfIn PDF document text
    • http://garifukedako.pbworks.com/w/file/fetch/144426777/33885078425.pdfIn PDF document text
    • http://funinupun.pbworks.com/f/the_arrl_ham_radio_license_manual_4th_edition_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/bf55a004-5d7e-432f-a9bc-7d9a2540dced/they_say_i_say_4th_edition_chapter_1_exercise_2.pdfIn PDF document text
    • http://fuxedemama.pbworks.com/w/file/fetch/144516144/10262268963.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9a6a7be5-0511-4f4a-9684-f0715c06c454/how_do_i_connect_my_brother_printer_to_a_new_wireless_network.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/1857e869-74b0-43bd-acc5-6793ba91b414/57618232487.pdfIn PDF document text
    • http://xojifot.pbworks.com/f/49463493143.pdfIn PDF document text
    • http://wiliser.pbworks.com/w/file/fetch/144475482/bunamutamosewatisimorute.pdfIn PDF document text
    • http://kipizasuzeda.pbworks.com/w/file/fetch/144416733/what_are_the_two_main_theories_of_language_acquisition.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_off0000e747.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE747 4672 bytes
SHA-256: d9b017e8e62870dbd1423e5827f79dc7dcf30ba3c20154053dd009618cf2f809
font_01_sfnt_off0000f746.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF746 10964 bytes
SHA-256: 14477fc137d5e29bf7a14475cf836a91d3c6c99f8a3d12c56d19e3e9570e7ce7
font_02_sfnt_off00011cbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11CBC 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378