Malicious PDF — malware analysis report

Static analysis result for SHA-256 e87e2eb4aec2523f…

MALICIOUS

PDF

82.3 KB Created: 2021-03-24 11:32:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-21
MD5: 6e168323d13db97f9447b7936a8f4fc1 SHA-1: 2c3f3ed67af81c59d42575db56e9769e44df1596 SHA-256: e87e2eb4aec2523f9aa43e64c542c1dac1ec9b691fcbcfcd3802ec920c07a3c7
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains and acting as a link farm, a common tactic for phishing or malware distribution. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or trojan delivery. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://dugedepap.ru/strik?utm_term=what+is+inferential+statistics+definition+psychology PDF link annotation
    • https://cdn.sqhk.co/wemukubiv/khihhhj/kixorovudanazazarive.pdfIn PDF document text
    • https://cdn.sqhk.co/tidilotofuka/jgvhiYD/friendly_letter_writing_worksheets_for_1st_grade.pdfIn PDF document text
    • https://cdn.sqhk.co/tokafumotebi/QcVgegf/best_love_ringtone_download_mp3_2019.pdfIn PDF document text
    • http://limezage.scienceontheweb.net/michael_jackson_moonwalk_book.pdfIn PDF document text
    • http://lovotilowojixo.iblogger.org/antas_ng_pang_uri_worksheets.pdfIn PDF document text
    • http://rowowesofazov.medianewsonline.com/itunes_hip_hop_charts_top_100.pdfIn PDF document text
    • http://jovalevuwalu.22web.org/adobe_photoshop_without_creative_cloud.pdfIn PDF document text
    • https://cdn.sqhk.co/muligumixe/Rjf0hbj/poll_game_questions_about_yourself.pdfIn PDF document text
    • https://cdn.sqhk.co/novigigexuxo/Asgimja/brain_teasers_questions_and_answers_in_malayalam.pdfIn PDF document text
    • https://cdn.sqhk.co/zikufivol/ddPhihb/mevunima.pdfIn PDF document text
    • https://cdn.sqhk.co/dexizajifu/ofjfVah/technology_background_information.pdfIn PDF document text
    • http://roxelejabojafe.scienceontheweb.net/how_to_change_day_in_casio_g_shock.pdfIn PDF document text
    • https://cdn.sqhk.co/vumojakizaw/hdf2GAD/rizupinakozilaje.pdfIn PDF document text
    • https://cdn.sqhk.co/vovewotutal/hjXggjj/25757374490.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://velawomonoxejuz.epizy.com/anaconda_2_full_movie_in_hd.pdfIn PDF document text
    • http://fadezanunadafik.myartsonline.com/vijatonifivarunudufil.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b89fb6db-136d-450d-9a39-20b43aabaadd/gezetemenojep.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca41c22d-11cc-4a1f-a6ba-80f1d3085fc9/brother_cs5055prw_project_runway_limited_edition_computerized_sewing_machine_white.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ed90984a-a84b-4d21-a52c-82e1cf856072/dafirinevuvadager.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/758c4a0c-e24a-4ee6-be90-f6d4abb627f6/suradevexawoperedepe.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/a9dcb697-1099-4c7a-b58e-fe406617fb45/film_jack_reacher_never_go_back_full_movie_sub_indo.pdfIn PDF document text
    • http://vawerudarasikow.myartsonline.com/weber_charcoal_grill_starter_kit.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/b2dc9739-8f2d-4aa1-909d-135a51b627c2/tobemobixipododi.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/c6523f4e-90fa-48be-aef8-b75bf0122235/25774318524.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f850baee-f00b-4e03-a789-f9594807f1d7/the_end_of_dieting_by_dr._joel_fuhrman.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/6188b9e6-6388-408f-9625-93f31c3cc9c0/31645660473.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_off0000f924.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF924 5320 bytes
SHA-256: 3aeffbff4ca8e75ce7bb707310a14379132c8aa48248cfde8356e577bb036f9d
font_01_sfnt_off00010b3b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B3B 9868 bytes
SHA-256: cc6547ce6d4197583564a71fb3b9a8f7035a93002c018b3c83869105d0beb944
font_02_sfnt_off00012d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12D13 4324 bytes
SHA-256: 4fcfa7c68d76e23b667942a3ac892d2d5d88346478daafc61479ad4df4af3dd3