Malicious PDF — malware analysis report

Static analysis result for SHA-256 c828c4eddb1c86e1…

MALICIOUS

PDF

113.1 KB Created: 2021-03-16 04:27:50 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-22
MD5: 01bd83ef007a77067a330d0a8d4290a4 SHA-1: 90b383c623ea20825098b848500b9d39470353d1 SHA-256: c828c4eddb1c86e1e7165edd23c6353dfe3642fd6d4ba7081030d080400e5bb7
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 0.9991

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://kuzutuzo.ru/wix?keyword=career+highlights+examples+for+finance PDF link annotation
    • https://cdn.sqhk.co/lomasamube/izxMzje/mobile_payment_devices_uk.pdfIn PDF document text
    • http://ch-data-2a8fv9s.pw/125174327233q7x6.pdfIn PDF document text
    • http://fsbsiod.com/how_to_connect_a_hp_printer_to_a_new_wifi_networko8naq.pdfIn PDF document text
    • http://car-test.pro/aristophanes_frogs_and_other_playsjen7g.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jbQbZmn/90124501470.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwifoviwalo/g9QTPjc/funny_free_viral_videos_of_all_time.pdfIn PDF document text
    • http://awpmode.com/the_worlds_sixteen_crucified_saviors_christianity_before_christt7b1v.pdfIn PDF document text
    • http://mexawolin.medianewsonline.com/87725500807.pdfIn PDF document text
    • http://xamojopilupivo.scienceontheweb.net/92975274251.pdfIn PDF document text
    • http://wowit.pro/bsc_1st_year_computer_science_book_downloadcs407.pdfIn PDF document text
    • http://latuha.com/bojanunijozorinixunez9tqa1.pdfIn PDF document text
    • https://cdn.sqhk.co/fasotaluvose/gTTSjhq/mindset_coach_certification.pdfIn PDF document text
    • http://lipazegeboludep.sportsontheweb.net/10521124386.pdfIn PDF document text
    • http://twoup-viktoria.online/youtube_gospel_song_i_am_a_child_of_godagw71.pdfIn PDF document text
    • http://xilibinebosapeg.mywebcommunity.org/valonoremajeden.pdfIn PDF document text
    • http://calipshatngaccs1.xyz/mewipapowimodifilezovujxb4.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/1d875677-84fb-44ff-a210-0e837c142e06/nukaniw.pdfIn PDF document text
    • https://s3.amazonaws.com/jeworurowam/mercury_15_hp_4_stroke_outboard_owners_manual.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/48610196-40e0-41da-bd53-324aa58096c6/94828777777.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e4fcaaaa-832a-4b37-8b58-7587bafa90db/how_to_reset_yamaha_receiver_rx-v383.pdfIn PDF document text
    • https://s3.amazonaws.com/xamibebulosaxug/vuvixizerejowezezibafe.pdfIn PDF document text
    • https://s3.amazonaws.com/pidufozu/31751676726.pdfIn PDF document text
    • http://sazasewugekupej.onlinewebshop.net/98078417529.pdfIn PDF document text
    • https://s3.amazonaws.com/jonora/fairest_isle_purcell_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/zosevid/soothing_music_for_deep_sleep.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_off00016fff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16FFF 5308 bytes
SHA-256: 69b0db15a14eddff64c22d634eb4e34dc8a305c0c940877a1791dd9fac86f115
font_01_sfnt_off000181f4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x181F4 11408 bytes
SHA-256: f9ff7a9495804a3ce5d7334d7a8d4bbc425145a8b0d4dcf544df71dabf9f2c87
font_02_sfnt_off0001a8c4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A8C4 4324 bytes
SHA-256: d1f4a20f0e35a0564be54678b929bb8c711862c507f070c2b9a6abea8daf4378