Malicious PDF — malware analysis report

Static analysis result for SHA-256 90091bbdc9acf5f6…

MALICIOUS

PDF

71.8 KB Created: 2020-12-25 16:36:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-07
MD5: dd6e138f5ea3c7e554d9893b59014208 SHA-1: 1de58a141edecc88f415f653719aab6fc01ad712 SHA-256: 90091bbdc9acf5f6a28fb89ff24cd805e924e60fc3d0707f6b6f4cdd451c0dc4
154 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, pointing to a suspicious URL. The ML classifier also strongly flagged this PDF as malicious. The embedded URL is likely intended to lure the user to a phishing site, which is a common tactic for initial access via spearphishing attachments.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 4

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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://gettraff.ru/123?utm_term=mac+mth-80+reddit In PDF document text
    • https://cdn-cms.f-static.net/uploads/4451033/normal_5f9f9343a3799.pdfIn PDF document text
    • https://cdn.sqhk.co/wavoperusina/SCxANTl/50000362879.pdfIn PDF document text
    • https://cdn.sqhk.co/pegebatanuz/gjjfahc/bedwars_maps_for_mcpe.pdfIn PDF document text
    • https://cdn.sqhk.co/jigidokasaga/geMifjb/the_loophole_denton_texas.pdfIn PDF document text
    • https://cdn.sqhk.co/vetesomiw/jhM7CLb/crowded_city_in_the_world.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369646/normal_5fb276f0934c5.pdfIn PDF document text
    • https://cdn.sqhk.co/peluxisomex/S5mVSmR/xodifizelezisam.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://s3.amazonaws.com/kifutizijebuj/best_free_online_video_er_for_pc.pdfIn PDF document text
    • https://s3.amazonaws.com/dezajok/21906161522.pdfIn PDF document text
    • https://s3.amazonaws.com/jukezeluf/72962376864.pdfIn PDF document text
    • https://s3.amazonaws.com/tugabijenovili/telecharger_roman_la_boite_a_merveille.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/756ad1e3-7e57-45f3-8a98-962345c3a93b/download_filmes_2019_torrent.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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ce71.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE71 4912 bytes
SHA-256: 8131dbf7b41e613c95a5198133800f17bf447a8a566ad5036f78b32a9c3efd7f
font_01_sfnt_off0000df27.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF27 10960 bytes
SHA-256: aca4217543925e8cc32c72696af3950fc1cbb690c14dfbf4bc32e51ec1a0e577
font_02_sfnt_off00010466.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10466 4324 bytes
SHA-256: 1062cd8ddf90f4344fa193b395386d5669df1a952e5759311ca261a71931f361

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