Malicious PDF — malware analysis report

Static analysis result for SHA-256 481c657731276bbb…

MALICIOUS

PDF

73.9 KB Created: 2021-01-02 14:01:28 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-14
MD5: c4a715688dcf64c01022586d36902446 SHA-1: 273b6e37e0c89834393a62bb9f33a67c73d99328 SHA-256: 481c657731276bbbaeaf73e0179211822c7e3233a6d876ad4d7b146f6b88d72f
162 Risk Score

Malware Insights

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

The PDF contains a critical heuristic firing for a malicious redirector link, indicating it leads to malicious infrastructure. The ML classifier also strongly flagged this PDF as malicious. While no scripts were extracted, the presence of a malicious link and the 'download button' heuristic suggest the document's purpose is to trick the user into navigating to a harmful URL, likely for phishing or malware delivery.

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.
  • 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
  • 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://traffmen.ru/aws?utm_term=cafe+fernando+kitap+pdf+indir In PDF document text
    • https://cdn.sqhk.co/suwezuzifu/qojjij0/ps4_simulation_games_free_download.pdfIn PDF document text
    • https://cdn.sqhk.co/kafevinuva/bjhrja9/811942728.pdfIn PDF document text
    • https://cdn.sqhk.co/vavusiwi/gjdghji/company_of_heroes_board_game_review.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4386081/normal_5f974a6c92bee.pdfIn PDF document text
    • https://cdn.sqhk.co/tuponapalab/gjghicR/chocolate_protein_shake_recipes_healthy.pdfIn PDF document text
    • https://cdn.sqhk.co/zoboxoba/3gchjha/3568623053.pdfIn PDF document text
    • https://cdn.sqhk.co/zafupusapun/jfgeZhi/wrap_rope_for_storage.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4426812/normal_5fb3637d64935.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/9b74ecfe-b77e-4654-9196-ee07859718f8/vehicle_lease_agreement.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ef215f6-baca-4815-aa17-9b08cdcc6d40/63686604288.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/67cfd7a5-416b-4567-b63a-7b339a43a98b/high_fiber_cat_food.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/afb58a4d-8d01-4bda-99b3-7f6f3b7b61f0/68840528545.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_off0000e52e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE52E 4792 bytes
SHA-256: 2eafe48d6c9236c02fa231f4b04a8e29efe2e2dec1abd235045461b26561aef8
font_01_sfnt_off0000f591.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF591 11084 bytes
SHA-256: b23df1deac58becb12f3896e64c73ee2226ae4ed63fcb98eaf64a375f6f0d1b3

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