Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca6d2d5439a0690e…

MALICIOUS

PDF

77.5 KB Created: 2021-03-21 08:16:56 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: b678cf81dfa301d35eed71d54a3dd1ce SHA-1: 3ff44febd762f0ef475d5a166cad85c6399bfd27 SHA-256: ca6d2d5439a0690e9ccfe642aa275df1a276515bfb06f283f41535ccf69cc877
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan' and an ML classifier indicating a high probability of maliciousness. The presence of a PDF link farm, with 30 external links, suggests an attempt to distribute further malicious content or engage in SEO abuse for phishing. The primary external URI points to a URL that appears to be part of a keyword-driven content site, likely a lure.

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://vilenefex.ru/wix?keyword=maytag+side+by+side+refrigerator+owners+manual PDF link annotation
    • http://antinomi.design/o_level_pakistan_studies_book_download9usmd.pdfIn PDF document text
    • http://4escam-bot.online/actron_erase_codes7ifcg.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://4ef57e19-9a2e-4e6f-a444-f6b59f982a39.filesusr.com/ugd/4c1554_3eb06eb3d5064d38b8284e908b132868.pdf?index=trueIn PDF document text
    • https://e510c2d5-567e-4a96-89ff-abc18316baf7.filesusr.com/ugd/8a9bcc_1b396f19d87641d4aca675f4786de60a.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/fekife/38870949759.pdfIn PDF document text
    • https://s3.amazonaws.com/juwofuxufijup/cost_of_original_autocad_software.pdfIn PDF document text
    • https://s3.amazonaws.com/feliso/62532272700.pdfIn PDF document text
    • https://c83cbd6e-a134-4b49-ba12-49f24c654ad9.filesusr.com/ugd/904a8b_db23ce2da7784d4893e5d4b4a756ed10.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/jofunozuzof/base_de_datos_definicion.pdfIn PDF document text
    • https://s3.amazonaws.com/suxiweke/amazon_kindle_desktop_app.pdfIn PDF document text
    • https://56148a0a-83a3-4003-94ff-78d3044b7c00.filesusr.com/ugd/6f5f23_6e8b7e74c908429ea4c734b1a5dff9c2.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/rutufokedizon/present_perfect_tense_worksheet_for_class_8.pdfIn PDF document text
    • https://s3.amazonaws.com/wexoteluwag/porque_no_me_crecen_las_uas_y_el_cabello.pdfIn PDF document text
    • https://6ddb26ad-aa8e-4a3e-a925-5cef6fc035e1.filesusr.com/ugd/d3d820_77360861b6dc4b5b975a02dee89d1067.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/sirilagewuga/glory_betting_tips_correct_score_vip_apk.pdfIn PDF document text
    • http://gaxilitexu.onlinewebshop.net/23931571764.pdfIn PDF document text
    • https://s3.amazonaws.com/fezenur/netix.pdfIn PDF document text
    • https://s3.amazonaws.com/fevobelijogal/biografi_abbas_bin_firnas.pdfIn PDF document text
    • http://zodofujeki.atwebpages.com/61993672674.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_off0000f258.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF258 5564 bytes
SHA-256: 2df8aff842507810039a0058ecb7595045f162b4ab2a4ea78d3935f185bcf9c5
font_01_sfnt_off00010551.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10551 10344 bytes
SHA-256: a15f15d4e0255b6b8824934da9c945ee8cef9294efb011be8286fd38f297bd60

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