Malicious PDF — malware analysis report

Static analysis result for SHA-256 90a963bf9fd8677c…

MALICIOUS

PDF

77.2 KB Created: 2021-01-04 08:53:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: 3bc6498cf9cd5ae7aa3a8d9d8539b796 SHA-1: d57cc5c9e305b500820a32924bd0d75b82c2905c SHA-256: 90a963bf9fd8677c452d8e0bc0bd494a22c13d91ac93f6ac2921c30da9244ac1
214 Risk Score

Malware Insights

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

The PDF contains a high number of embedded links, with at least one pointing to known malicious redirector infrastructure. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. While no scripts were extracted, the PDF structure and embedded URLs suggest an attempt to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • 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://traffking.ru/123?utm_term=transit+police+reunion+2018 In PDF document text
    • https://static.s123-cdn-static.com/uploads/4492286/normal_5fccfccfb3ae5.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366408/normal_5f872c3133024.pdfIn PDF document text
    • https://cdn.sqhk.co/zewuxumaro/hdQiijg/highway_patrol_office_meridian_ms.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/kenuzofi-badexa-mavok-rusikufu.pdfIn PDF document text
    • https://cdn.sqhk.co/kovixileta/gjDjggd/space_wolf_omnibus_audiobook.pdfIn PDF document text
    • https://cdn.sqhk.co/kinibemazoz/cifNx6F/world_warships_combat_download.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4410199/normal_5f9d114339a8a.pdfIn PDF document text
    • https://cdn.sqhk.co/fepixuzutol/idzhcGY/word_crush_hidden_themes_space_answers.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/lewuli/joint_management_body_audited_report_2017.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/2b2a8d89-0d86-44d3-9cef-f59a7a32c891/15388902569.pdfIn PDF document text
    • https://s3.amazonaws.com/wikurixobelu/9441078313.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/87773386142.pdfIn PDF document text
    • https://s3.amazonaws.com/zazelujeju/play_payday_board_game_online.pdfIn PDF document text
    • https://s3.amazonaws.com/patotale/bal_krishna_wallpaper_free_for_mobile.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_off0000f0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF0B0 5396 bytes
SHA-256: 63316ddcfe9587ca9f42c6d91dde43ce88cbfb940f4144c70bcfd88db9dcb160
font_01_sfnt_off00010316.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10316 10824 bytes
SHA-256: f78d360342f90ae0d4c6b58b8f5ab04e2102dd57cc27240bb936ea57873ed71f

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