Malicious PDF — malware analysis report

Static analysis result for SHA-256 d3e1618379302926…

MALICIOUS

PDF

80.2 KB Created: 2020-12-30 08:49:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-10-27
MD5: b35ed5d6f253cdf661a951f81a65e0fc SHA-1: eb598ca4a7d2ee5401c82fbf7cfff8c142bd5b88 SHA-256: d3e1618379302926d70e098e0e13bf5399b97715f988c5d2b2ce4b514cab818f
214 Risk Score

Malware Insights

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

The PDF contains a significant number of embedded links, with at least two identified as potentially malicious redirectors or part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent. While no scripts were directly extracted, the heuristic firings suggest the PDF is designed to lure users to external, potentially harmful, content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

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
  • 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 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.
  • 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://ggtraff.ru/strik?utm_term=airplane+for+sale+texas In PDF document text
    • https://lexigeme.weebly.com/uploads/1/3/4/5/134524735/lijidi.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4392193/normal_5fb47b38599a8.pdfIn PDF document text
    • https://mazogerivajusem.weebly.com/uploads/1/3/4/3/134341978/jokupebezujunu.pdfIn PDF document text
    • https://wumaluko.weebly.com/uploads/1/3/4/7/134716396/pesuzulekelaga_diveraxuju.pdfIn PDF document text
    • https://sasakafu.weebly.com/uploads/1/3/4/3/134371045/dejulujiwavu.pdfIn PDF document text
    • https://fobedixosofano.weebly.com/uploads/1/3/4/3/134377241/38abedc3.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4371261/normal_5fd1caaa1db49.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/wobuzisibal/mupafobigitobuwebaruzuta.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/9ce16f30-03e2-4bb0-a3b3-4214aa2a3347/borderlands_tiny_tina_porn.pdfIn PDF document text
    • https://s3.amazonaws.com/rakabexozu/sunejotizuvefigumu.pdfIn PDF document text
    • https://s3.amazonaws.com/jebokizez/bhopal_gas_tragedy_case_study_download.pdfIn PDF document text
    • https://s3.amazonaws.com/wozowuledij/foxtel_disney_movies_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/pugomonapoxuxe/dezotajurujipepemaja.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_004_off00010434.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x10434 27124 bytes
SHA-256: c5e3c505f51f5c11b098709502de99ae1a868f042648fd5993e4e259f8ab5dfa
font_00_sfnt_off0000cee8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCEE8 4952 bytes
SHA-256: ed80cc11e4582a19086d3af1fb020108344e6fce510095edba0ae10c5293dc34
font_01_sfnt_off0000dfd1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFD1 10540 bytes
SHA-256: 15183dd82e916eb11f3cebed93214554e501d384a15d3aa7da12c9271ea43b17

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