Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca97bcd5bcdda285…

MALICIOUS

PDF

68.7 KB Created: 2021-03-07 19:59:58 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 3fab0e846e59b82f9af7b648cc75fe05 SHA-1: 565c1e8cf24d8d7d25fba62937836d6a2b08dc47 SHA-256: ca97bcd5bcdda285eeed8ce7f2845073cb6d493bc3c035ec3827299ced159cdc
164 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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 contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://crophysi.ru/wix?keyword=dsc+trouble+codes+4 PDF link annotation
    • https://cdn.sqhk.co/vunebapenuj/Fhhijji/hungry_shark_free.pdfIn PDF document text
    • http://xufamorazogubov.sportsontheweb.net/asus_4g-ac68u_hard_reset.pdfIn PDF document text
    • https://cdn.sqhk.co/tiwefuxab/Dezhf7C/wijuvatekujagekonurajuj.pdfIn PDF document text
    • https://cdn.sqhk.co/risubibasero/dldidgd/drive_on_autobahn.pdfIn PDF document text
    • http://sivolejujivozul.scienceontheweb.net/about_face_4_the_essentials_of_interaction_design.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/VJfpLRR/dreamer_movie_2020.pdfIn PDF document text
    • https://cdn.sqhk.co/foroboreb/dao7Qg2/12898940255.pdfIn PDF document text
    • https://cdn.sqhk.co/nefakovuwot/chAewge/stunt_bike_freestyle_apk_mod_money.pdfIn PDF document text
    • https://cdn.sqhk.co/matelasoguje/jjlidhe/70118399397.pdfIn PDF document text
    • https://cdn.sqhk.co/momujolo/MGqhas5/nba_3_point_contest_2020_free_live_stream.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/nuvukivaxiren/95165042838.pdfIn PDF document text
    • http://xolavozezimodan.onlinewebshop.net/53695502933.pdfIn PDF document text
    • https://s3.amazonaws.com/sojenozap/dewalt_atomic_20v_max_drill_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sazixipame/70975062950.pdfIn PDF document text
    • https://e05653fc-386e-4c8b-889d-738aee72c63e.filesusr.com/ugd/62421a_7182b4b3ccde458aa7adec40791d110c.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/temujonuwu/garmin_62s_vs_62st.pdfIn PDF document text
    • https://s3.amazonaws.com/fejenijovekozu/sora_anti_form_kh2.pdfIn PDF document text
    • https://a161ff94-1a6f-4367-b6f8-8e513a5e676d.filesusr.com/ugd/4c7633_7ca4d109049a44cd9aee3e7c8db11721.pdf?index=trueIn 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_off0000d151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD151 4948 bytes
SHA-256: 08b549471022178771ee6c851a802861ee19c8be73450755bac3bd358963492e
font_01_sfnt_off0000e23a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE23A 10536 bytes
SHA-256: 0d52bbab7fa3cdbab7a9cb8ebb83f7fd9335d54099e498340b17d9927fbc416a

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