Malicious PDF — malware analysis report

Static analysis result for SHA-256 f59ecd667c5055bb…

MALICIOUS

PDF

95.4 KB Created: 2021-04-01 21:02:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: fe2b990005bddca205cfc23fa27514a7 SHA-1: ace46ab23cf1516f0a922ec4ac74a47a6561b6f2 SHA-256: f59ecd667c5055bb85a468bc7a4fe700d7fa89309dfabd4a4cfa5a7f7a779e3d
126 Risk Score

Malware Insights

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

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URIs pointing to disposable domains and link farms, suggesting a phishing or malware distribution campaign. The presence of embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious sites, likely as part of a spearphishing attachment attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://maypoin.ru/award?keyword=certificado+medico+pdf+mexico PDF link annotation
    • https://cdn.sqhk.co/lidupusumoj/WYLJhRa/pixiv_app_pc.pdfIn PDF document text
    • http://myfirstsite.xyz/866755617397dlsv.pdfIn PDF document text
    • http://axecheat5.xyz/dank_snapchat_lensesn4i7o.pdfIn PDF document text
    • http://legrand-spb.ru/operating_systems_besides_windows_mac_and_linuxkqyuy.pdfIn PDF document text
    • https://cdn.sqhk.co/ketejeti/gijiShb/outdoor_survival_skills_games.pdfIn PDF document text
    • http://weareanonymous.org/does_costco_sell_vacuums66jy3.pdfIn PDF document text
    • https://cdn.sqhk.co/votezevon/RtIqggd/excel_2019_calendar_template.pdfIn PDF document text
    • https://cdn.sqhk.co/dejijadu/NidE8jb/lullaby_songs_for_infants_free_download.pdfIn PDF document text
    • http://gogotmif.space/61877939610jnu3i.pdfIn PDF document text
    • https://cdn.sqhk.co/fanoxozowupe/gcOichd/only_one_ali_gatie_lyrics_traduction.pdfIn PDF document text
    • https://cdn.sqhk.co/kifuzopeko/BicVib0/99691744958.pdfIn PDF document text
    • https://cdn.sqhk.co/pimepojuti/jjcVGi4/28431778110.pdfIn PDF document text
    • http://hookup154.online/track_saw_guide_rail_compatibilityudvl1.pdfIn PDF document text
    • http://normaa-id.com/895405647dylag.pdfIn PDF document text
    • https://cdn.sqhk.co/kenipafitu/9jegcJS/febigisivipolo.pdfIn PDF document text
    • http://jadebey-x.com/ximekonill2gdd.pdfIn PDF document text
    • http://everydays.space/black_and_decker_mouse_sander_replacement_partshkhqv.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://s3.amazonaws.com/veledabejufi/que_significa_juicio_final_en_la_biblia.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/15ceae92-0fc6-4b95-9dd8-1eb9b3f1e205/nursing_diagnosis_for_hypertension_slideshare.pdfIn PDF document text
    • https://s3.amazonaws.com/divikufifir/coliform_organisms_in_milk.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/712cc572-e0e3-4df1-94d7-948f788cfbbf/viper_alarm_no_sound.pdfIn PDF document text
    • https://s3.amazonaws.com/sefiwegegagu/action_replay_max_ps2_elf_download.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2f7141f1-18e5-433a-a0ad-af0226a34cca/faxisojoxadilesigeb.pdfIn PDF document text
    • https://s3.amazonaws.com/zevutebulaworel/86311149468.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/34518f64-20bf-4bbe-ab7c-862a3e3e6e6e/48427857960.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
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00011456.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11456 4864 bytes
SHA-256: 0f238a0bbf92675881d2eb7d83ba6d33d27cd8b2ef9b7af0cb987c6d82af0d1e
font_01_sfnt_off000124e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x124E4 11364 bytes
SHA-256: 73666db78781fe8d493dc8ee32fd027c47dbba08d125bb9bc4d02a98434793a6
font_02_sfnt_off00014a03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14A03 16204 bytes
SHA-256: 532315dfdc59b350d447ad91845dd8cc72a836e684f536ab9a4305dc5b53fb8e
font_03_sfnt_off00015f33.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15F33 4324 bytes
SHA-256: cd94ef65598b1866d0653cdd88243d989fd81359c0e770c2d3a4858f1c2f6d34