Malicious PDF — malware analysis report

Static analysis result for SHA-256 71e470d738922edc…

MALICIOUS

PDF

75.2 KB Created: 2021-03-19 23:53:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-13
MD5: 9370e114a2197518547acb11aadaf139 SHA-1: 5535386647b444c7f386f984adb9c0331edd18c9 SHA-256: 71e470d738922edcad4c448ddc784ad66aca44ee0088362da1b2771717915108
126 Risk Score

Malware Insights

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

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The document contains an embedded URI pointing to 'https://jottigo.ru/123?utm_term=wedding+greeting+card+templates', which is likely used to redirect the user to a phishing or malware-hosting site. The document body, though heavily obfuscated, contains metadata suggesting it was generated by wkhtmltopdf, a tool sometimes used to create malicious PDFs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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://jottigo.ru/123?utm_term=wedding+greeting+card+templates PDF link annotation
    • http://teatr-art.com/vadetorodimareri6ykk8.pdfIn PDF document text
    • http://stylecurtains.com/bonjour_for_windows_7_itunes0bv1n.pdfIn PDF document text
    • http://aydym.club/how_to_start_investing_in_penny_stocks_onlinevsdwp.pdfIn PDF document text
    • http://bitcoinlearningcentre.online/53262692911ohyd0.pdfIn PDF document text
    • https://cdn.sqhk.co/balapakufogo/gcTgge9/world_war_1_recruitment_posters_australia.pdfIn PDF document text
    • https://cdn.sqhk.co/lovolipeg/28kihlk/36632568844.pdfIn PDF document text
    • http://optamorem.com/6013127852jnlqq.pdfIn PDF document text
    • https://cdn.sqhk.co/lizasizova/aiiigkp/spanish_immersion_kindergarten_worksheets.pdfIn PDF document text
    • https://cdn.sqhk.co/gefeloxo/pOijewL/splendor_meaning_into_urdu.pdfIn PDF document text
    • http://meinekarten.best/persuade_inform_entertain_song77e1r.pdfIn PDF document text
    • http://arfesopt.com/kyocera_ecosys_fs-3140mfp_manual_espaolfh8fa.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/85de169c-290c-4c35-af29-4200a7441ad2/little_house_on_the_prairie_season_9_episode_10_dailymotion.pdfIn PDF document text
    • http://jafixomedimun.onlinewebshop.net/learning_objectives_and_learning_outcomes.pdfIn PDF document text
    • http://wejajesenopezoj.onlinewebshop.net/tipeda.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/33b6f7ca-a22a-494d-b52f-134f123d08b3/how_to_fix_slow_acer_laptop_windows_10.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8c8b54f8-ca7d-40b5-854c-14003d98628f/how_to_use_blender_software_tutorials.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/3c56396b-4566-4d0f-8a15-b4a2bfb7f3fa/keratin_complex_smoothing_treatment_reviews.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/cafb9f10-14e4-4169-9342-db6e288ec28c/54241881771.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ae252320-df1e-4ba6-b98a-c53704cf3b2b/rockwell_1734-ib8_wiring.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/4266554d-c0ff-4719-9e5b-a75d7cda9fe1/5th_step_of_surya_namaskar.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_off0000ea41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA41 5404 bytes
SHA-256: d8490efa7e6434412e734a8d93d4fd909977c85cd23721cc53566affc27c52ae
font_01_sfnt_off0000fc99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC99 10276 bytes
SHA-256: 0c001644dd780c3383280ec1f22456d15153981955f199da3a4ffa620a1f9775