Malicious PDF — malware analysis report

Static analysis result for SHA-256 6519c745ffee6f91…

MALICIOUS

PDF

82.8 KB Created: 2021-02-02 20:51:23 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-15
MD5: 1811ce85c15c6012b2c88851ccecbdeb SHA-1: 9f7fa4b7ad7bc6d73c4079c0dd2a35ad785a7be1 SHA-256: 6519c745ffee6f9182e7797354cc073e6443baef5f9f72e6babeeb21e8f10c68
156 Risk Score

Malware Insights

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

The file is a PDF containing a large number of external links, many of which point to suspicious domains. The 'PDF_SEO_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm. ClamAV and ML classifiers also flagged this as malicious, specifically as a phishing trojan. While no scripts were directly extracted, the nature of the links suggests a phishing or malicious redirection attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://crophysi.ru/123?utm_term=cerave+skin+renewing+cream+serum+before+and+after PDF link annotation
    • https://cdn.sqhk.co/kagelemovo/hCAyib6/88591138802.pdfIn PDF document text
    • https://cdn.sqhk.co/tigixexaxi/16mZjaJ/82142831495.pdfIn PDF document text
    • https://cdn.sqhk.co/dosakupu/gifFwsi/so_here_we_go_meaning_in_urdu.pdfIn PDF document text
    • https://cdn.sqhk.co/kapapomabu/11TMPbh/personal_swot_analysis_examples_doc.pdfIn PDF document text
    • https://cdn.sqhk.co/vuzefegevo/Z0IgfMF/bloody_harry_suit.pdfIn PDF document text
    • https://kapebuzuzevasa.weebly.com/uploads/1/3/4/5/134587117/nijemituvojuwexaf.pdfIn PDF document text
    • https://sovufejado.weebly.com/uploads/1/3/0/7/130740048/jibumevuf_lokofirawezu.pdfIn PDF document text
    • https://kifosaxuwaf.weebly.com/uploads/1/3/4/0/134016965/wezolu.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/tixeligufokup/active_directory_2012_administration_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/gimisorixosu/design_methods_and_analysis_of_algorithms.pdfIn PDF document text
    • https://s3.amazonaws.com/putelekireza/house_construction_agreement_format_in_telugu.pdfIn PDF document text
    • https://s3.amazonaws.com/nawosineromigi/golupan.pdfIn PDF document text
    • https://s3.amazonaws.com/fapaga/textview_bold_android_studio.pdfIn PDF document text
    • https://s3.amazonaws.com/wupiwupiwot/gimme_gimme_thoroughly_modern_millie_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/xirixepo/employee_resignation_letter_template_uk.pdfIn PDF document text
    • https://s3.amazonaws.com/jinotugiwomo/pilamesonutigudivo.pdfIn PDF document text
    • https://s3.amazonaws.com/jaxesabi/types_of_automated_guided_vehicle_system.pdfIn PDF document text
    • https://s3.amazonaws.com/dugibabafod/ready_alessia_cara_song.pdfIn PDF document text
    • https://s3.amazonaws.com/jujojomojemiz/pub_lottery_bonus_ball_play_sheet.pdfIn PDF document text
    • https://s3.amazonaws.com/wiwamoxamo/arteria_iliaca_primitiva.pdfIn PDF document text
    • https://s3.amazonaws.com/risalenefazozo/zozas.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_off00010315.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10315 5568 bytes
SHA-256: 50b64c5f22120933544f32f540d90f6f2b917c94287cf638c6129d86954ba5ab
font_01_sfnt_off00011609.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11609 11040 bytes
SHA-256: 84509ae38892cd0d510952d68f4a404bc942bc68a9de974228bd5c0ef2323ec0

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