Malicious PDF — malware analysis report

Static analysis result for SHA-256 81c3666302898241…

MALICIOUS

PDF

73.6 KB Created: 2021-02-26 15:42:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-22
MD5: df99591afca4faa9b250edd21766689f SHA-1: 4cd8e11be9ed15d269a457868347453dd2c0f9a5 SHA-256: 81c3666302898241e1e4e4208f5f74dff18b8f8e6c393881d17f0b3a4c14c85f
136 Risk Score

Malware Insights

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

The file is a PDF that contains an invisible link designed to trick users into clicking it. This link directs to a suspicious domain, likely for phishing or malware distribution. ClamAV detection and ML classification strongly indicate malicious intent, specifically as a phishing or trojan delivery mechanism.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9999

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
  • Image-heavy PDF with invisible link to suspicious domain high PDF_SUSPICIOUS_LINK_LURE
    PDF is a small image-heavy lure with invisible link annotations that send the user to a suspicious high-risk-domain URI. This matches credential-phishing carriers where the visible document is only a prompt and the real collection flow happens on the linked website.
  • 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://nipisod.ru/wb?keyword=to%20kill%20a%20mockingbird%20poetry%20connections PDF link annotation
    • http://infokurs.design/25350131468uqc1r.pdfIn PDF document text
    • http://securityofusersdevicesonline.site/swift_handbookhqtte.pdfIn PDF document text
    • http://rentline.pro/besilekaqin3d.pdfIn PDF document text
    • http://wide-take.top/10038152500wczqa.pdfIn PDF document text
    • https://cdn.sqhk.co/keropolor/bAKigEF/tangled_the_series_varian.pdfIn PDF document text
    • http://plsale.pro/mathias_mhere_favour_albumt7fmn.pdfIn PDF document text
    • http://innov-cis.net/durga_chalisa_telugu_downloada75o9.pdfIn PDF document text
    • https://cdn.sqhk.co/definuseju/2munriK/manafelirisemoxoxi.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/luxaduzimase/69572935594.pdfIn PDF document text
    • https://s3.amazonaws.com/kewuxejikiwe/baal_veer_episode_1103.pdfIn PDF document text
    • https://s3.amazonaws.com/pegebunov/android_9_galaxy_s8_review.pdfIn PDF document text
    • https://s3.amazonaws.com/sulasatevirexo/sbi_green_card_application_form.pdfIn PDF document text
    • https://s3.amazonaws.com/bamepofewalada/59663984557.pdfIn PDF document text
    • https://s3.amazonaws.com/kosamupim/kirchhoff_s_law_worksheet_with_answers.pdfIn PDF document text
    • https://s3.amazonaws.com/nufidibodudulad/metformin_1000_mg_uses.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_off0000e1e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE1E0 5648 bytes
SHA-256: a1ec62d4c938ad9b18ad18a0306757e2476ff77243a1a6d428500f8a67b55ca0
font_01_sfnt_off0000f4ff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4FF 10220 bytes
SHA-256: 8544d0fd076261f9f7e77e3ef2e199ebdfa362008d4781fd8115bc7677439d4d

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