Malicious PDF — malware analysis report

Static analysis result for SHA-256 9379a77f75c26630…

MALICIOUS

PDF

92.3 KB Created: 2021-04-06 15:19:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 4b87be98fe530db386d69d0c7fdfcb4a SHA-1: 2cbdac9b302186657bc6a8a13652e42b3b368f11 SHA-256: 9379a77f75c266301c9fc1db026f6c23fc38276d8ac047a4e9ea95c9fcadae90
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF was flagged by multiple heuristics, including ML and ClamAV, as malicious. It contains numerous embedded URLs pointing to external sites, many of which are on disposable hosting, suggesting a link farm or phishing lure. The presence of 'utm_term' parameters in some URLs indicates tracking or redirection, further supporting a malicious intent to drive traffic to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9992

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/aws?utm_term=how+to+program+a+radio+shack+triple+trunking+scanner PDF link annotation
    • https://cdn.sqhk.co/vafizolubev/ijicige/pick_me_up_crossword_clue.pdfIn PDF document text
    • http://counterman.ru/maytag_dishwasher_problems_with_control_panelzf8yx.pdfIn PDF document text
    • https://cdn.sqhk.co/ruwonumatag/egiigpS/rolling_stones_gimme_shelter_video.pdfIn PDF document text
    • http://nicechange.space/easy_star_wars_trivia_questions_and_answers_printablellf3g.pdfIn PDF document text
    • http://cetop.xyz/godox_tt685_manual_espaol7mffe.pdfIn PDF document text
    • http://vugewanir.22web.org/suvozakepe.pdfIn PDF document text
    • http://uaregroup.com/mepaxagizogekopopaleli8.pdfIn PDF document text
    • http://pomanonorajalam.22web.org/android_file_transfer_not_working_pc.pdfIn PDF document text
    • http://expressvpn.store/d_d_descent_into_avernus_downloadwu1zl.pdfIn PDF document text
    • http://getsol.xyz/create_hidden_photo_folder_iphonetd1xo.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4414489/normal_606393761781d.pdfIn PDF document text
    • https://cdn.sqhk.co/fuluniziwav/ieih8ij/subdural_hematoma_ct_report.pdfIn PDF document text
    • https://cdn.sqhk.co/juzilolawu/05zBPgh/android_tablet_reviews_2018_uk.pdfIn PDF document text
    • http://xobukafa.iblogger.org/irctc_ticket_cancellation_charges_2020.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4495558/normal_5fdab7c49ac96.pdfIn PDF document text
    • http://bestita.space/cuantas_diagonales_tiene_un_nonagono68ew1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4450631/normal_6035f600cca25.pdfIn PDF document text
    • https://cdn.sqhk.co/wadupaxi/hikIAVF/39524906461.pdfIn PDF document text
    • http://usesol.xyz/lolupatuu8ka6.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://vezapuro.rf.gd/cute_formal_dresses_for_13_year_olds.pdfIn PDF document text
    • http://folijurojavagig.epizy.com/hello_brother_video_songs_hd_free.pdfIn PDF document text
    • http://gerufufa.epizy.com/operational_amplifier_characteristics_and_applications.pdfIn PDF document text
    • http://foxebunuref.epizy.com/dozukenarevesofup.pdfIn PDF document text
    • http://zefadaxen.epizy.com/77184626078.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00012546.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12546 5604 bytes
SHA-256: db4ece5f51da2be95d8d1c7dde802472c7ca2ca969de9572e01fa54bafc7c79e
font_01_sfnt_off0001383a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1383A 12848 bytes
SHA-256: f989f8fbd7e3044dc53240722e65c56741b5bf9c881c726b084ec0134be07863

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