Malicious PDF — malware analysis report

Static analysis result for SHA-256 a1da377e3941f506…

MALICIOUS

PDF

85.0 KB Created: 2021-03-22 16:50:40 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-05
MD5: ce9cbc6e967a1d5ecfddb74d644ef346 SHA-1: 4793ac91993794e491508b7769947c90a7569149 SHA-256: a1da377e3941f50653ceb6e3d71b64c01bb034afe85d472568715078476548c8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one heuristic specifically identifying it as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or delivering a secondary payload via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9919

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://cdn.sqhk.co/rudixika/fjcUhiT/pdf_document_scanner_premium_4._27._0._0.pdf In PDF document text
    • https://cdn-cms.f-static.net/uploads/4409095/normal_601bab39863c6.pdfIn PDF document text
    • https://cdn.sqhk.co/metusoteliza/hcjrPR6/spacedraw_pro_apk.pdfIn PDF document text
    • https://cdn.sqhk.co/sokodajep/ic0wTG8/dunujuli.pdfIn PDF document text
    • https://cdn.sqhk.co/fujotojaxob/ujchciJ/42496963232.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4483082/normal_5fe9345b8c82b.pdfIn PDF document text
    • https://cdn.sqhk.co/temisexezoda/pjgu1Em/tabedorofudig.pdfIn PDF document text
    • https://cdn.sqhk.co/mabisurud/jcGCZK5/blackpink_jennie_outfits.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4452382/normal_602268cd25ef3.pdfIn PDF document text
    • https://cdn.sqhk.co/baxorurifina/bqjfjby/war_of_kings_facebook_tips.pdfIn PDF document text
    • https://cdn.sqhk.co/letarezetap/gchdjaG/lolegafofapolad.pdfIn PDF document text
    • http://lebepufu.mypressonline.com/reading_comprehension_skills_list_high_school.pdfIn PDF document text
    • https://cdn.sqhk.co/vulovosovem/hgfVshi/74955443373.pdfIn PDF document text
    • https://cdn.sqhk.co/wesifarajaru/IhbSUjj/44717248190.pdfIn PDF document text
    • https://cdn.sqhk.co/buzovegom/8dXjrje/music_identifier_firefox.pdfIn PDF document text
    • https://cdn.sqhk.co/fukonovum/dk9RziB/company_of_heroes_europe_at_war_game_modes.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4494431/normal_602d2af1e57ba.pdfIn PDF document text
    • http://wasatosu.sportsontheweb.net/96063090832.pdfIn PDF document text
    • https://cdn.sqhk.co/kuxefoxo/Zjgjggd/83666186999.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://feedproxy.google.com/~r/wb/ENAH/~3/3IgsHNHpEfs/wb?keyword=un%20metro%20cubico%20cuantos%20metros%20cuadrados%20sonPDF link annotation
    • http://wobadumiravolu.atwebpages.com/best_mutual_funds_for_2020_reddit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cec75f6-d3b4-490f-ba24-619c096ddf8c/god_of_carnage_alan_monologue.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2c68500f-4f9d-4e56-a751-f96fe580dbf0/what_font_are_music_dynamics_in.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a5c9b1a7-99c0-4b87-a76d-fd6e183a123b/44200925934.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/e1bc8532-87e7-4c95-a8b9-a3839c053ac6/fizes.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9161e467-afd4-4dd0-9ae5-1f10f6883a4f/big_fish_game_manager_app_for_mac.pdfIn PDF document text
    • http://piwakitidi.onlinewebshop.net/65463640964.pdfIn PDF document text
    • http://luvabokinoleg.onlinewebshop.net/40275357272.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn 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_off0000e587.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE587 6440 bytes
SHA-256: a606a6dede3b99472d2ac97761204782646b5f75106b48d1abccbe9a99ca9a4c
font_01_sfnt_off0000f57b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF57B 5184 bytes
SHA-256: 36f71cccf813c136cbda3722574132fbf09e72110f51866270941a79bf1d8681
font_02_sfnt_off00010700.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10700 12120 bytes
SHA-256: 39aaddf3269b7999ac1b9c8823f92c49f178d1a3b095de386ff8078e767149de
font_03_sfnt_off00012e73.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E73 16148 bytes
SHA-256: 64f21e55c2f29c6f605e8f9fd96e7f7b34f9b4a26fdc717ddead948457370e3b