Malicious PDF — malware analysis report

Static analysis result for SHA-256 99d559c61103ef9a…

MALICIOUS

PDF

73.3 KB Created: 2021-02-19 16:02:34 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-23
MD5: 100a6785f53941cf89caf515d18d97a1 SHA-1: 253b7afde896e5e890fb9f29b1ed5cc49a8ac2cc SHA-256: 99d559c61103ef9a570d7b948cfcf778d87a88c248aca66cf9ebca91025ecd75
184 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with several heuristics indicating malicious redirector infrastructure and link farms on disposable domains. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or scamming. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of a malicious document designed to lure users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

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.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • 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=casio+g-shock+ga-100cf-1a9er+opinie In PDF document text
    • http://govnosiakxws.online/vapovazaderobyevot.pdfIn PDF document text
    • https://cdn.sqhk.co/xijogedobu/nNhhkjf/auction_network_login.pdfIn PDF document text
    • https://wewiruvikaju.weebly.com/uploads/1/3/0/7/130775929/1073407.pdfIn PDF document text
    • http://rodina38.ru/cabanagem_resumoexe80.pdfIn PDF document text
    • http://amsidgi.xyz/vikipeuu7xy.pdfIn PDF document text
    • http://handler-autoscout24.com/dovetail_jig_templatebu94t.pdfIn PDF document text
    • http://fitokaps.xyz/technology_education_certification_practice_testvdurz.pdfIn PDF document text
    • http://porn77.design/how_to_write_about_a_sculpturecpmp2.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4407571/normal_5fc752eda5cb8.pdfIn PDF document text
    • https://cdn.sqhk.co/bafiweba/ckhb8cA/supebi.pdfIn PDF document text
    • http://milanomoda.site/density_times_height_times_gravityhrn2e.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/jupudizadid/inorganic_chemistry_book_by_huheey.pdfIn PDF document text
    • https://s3.amazonaws.com/luxelula/academic_performance_questionnaire_sample.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_off0000e2eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2EB 5596 bytes
SHA-256: 5694df8a62bd8ad0090cf1c9489ad7bf88d08973fffa6080e21692469be77788
font_01_sfnt_off0000f5fd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5FD 10188 bytes
SHA-256: 1c9b7eb2f6478e3304300bae106687339b41712f60c98ba77823daaac1e04f8f

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