Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdeda5e6c398fbb4…

MALICIOUS

PDF

82.0 KB Created: 2021-03-02 19:44:54 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 00aa835704af2f7ee721abbd61f76603 SHA-1: 2f03bf665c3f08c1c20a8947c665a467482fd723 SHA-256: cdeda5e6c398fbb4df3104da1dd6cb1a77c5678b19bd65e8a645e94f6ecfbb58
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains a large number of external links, identified by the PDF_SEO_LINK_FARM heuristic, suggesting a link farm or phishing operation. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were extracted, the presence of numerous external URLs, including one pointing to a potential second-stage PDF payload, suggests this document is part of a larger malicious campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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 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.
  • 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://ponafet.ru/123?utm_term=which+best+describes+the+grounded+theory+method PDF link annotation
    • http://sabumow.mygamesonline.org/hp_laserjet_m1217nfw_mfp_toner.pdfIn PDF document text
    • https://cdn.sqhk.co/zewumirapeb/4ifjfof/head_soccer_laliga_2020_apk.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/10355630260.pdfIn PDF document text
    • https://cdn.sqhk.co/kanedufopuma/iggigUc/dead_souls_target_zombie_survival_games_offline_download.pdfIn PDF document text
    • https://dujekiwirole.weebly.com/uploads/1/3/4/2/134266498/4781042.pdfIn PDF document text
    • https://cdn.sqhk.co/kisudosus/hfWgdhd/satos.pdfIn PDF document text
    • https://cdn.sqhk.co/limiwebu/hdyjd1L/21044865380.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/dakebesuvum/dufubazazid.pdfIn PDF document text
    • https://s3.amazonaws.com/xaliwalufoguni/application_form_for_hksar_passport_renewal.pdfIn PDF document text
    • https://s3.amazonaws.com/xomudufe/20569587571.pdfIn PDF document text
    • https://s3.amazonaws.com/nelizenejakarug/beginning_flute_sheet_music_free.pdfIn PDF document text
    • https://s3.amazonaws.com/towutoginadivu/tamil_whatsapp_status_song_hd.pdfIn PDF document text
    • http://tefetuzuzip.myartsonline.com/4736632715.pdfIn PDF document text
    • https://s3.amazonaws.com/varolexexus/betaina_de_coco.pdfIn PDF document text
    • http://gobavaduxa.epizy.com/alteraciones_cromosomicas.pdfIn PDF document text
    • http://xezaretidatoro.onlinewebshop.net/43270220457.pdfIn PDF document text
    • https://s3.amazonaws.com/tunenijexe/87508388885.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_off0001028b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1028B 5364 bytes
SHA-256: 45f8fbaa445bde840116ad799859355411b26e2412e2445ae10819ed3dc9e11f
font_01_sfnt_off000114b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B5 11180 bytes
SHA-256: 003e181a0320acb9bb8ef56bbb7f2d958c7cddbb246b35d33fb2c7a3356bfda0

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