Malicious PDF — malware analysis report

Static analysis result for SHA-256 2b75ca404cf46d3b…

MALICIOUS

PDF

68.3 KB Created: 2020-12-23 16:55:42 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-03
MD5: 2d66730d1ae531d449c24487a564c0a9 SHA-1: cf8e56d55b79c70c2ef4b533897b2fb8b1d60809 SHA-256: 2b75ca404cf46d3b6624811c5ea8f9609dc1f88fbcb4c2a955e337aa43cec281
192 Risk Score

Malware Insights

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

The PDF contains multiple heuristics indicating malicious intent, including a critical finding of a link to known malicious redirector infrastructure. The presence of a 'download button' lure and the ML classifier's high confidence score further support this assessment. Although no scripts were explicitly extracted, the PDF structure and embedded links suggest it is designed to redirect users to potentially malicious content or downloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://traffking.ru/aws?utm_term=amazon+annual+report+2017-+18+pdf In PDF document text
    • https://cdn.sqhk.co/nugutobudan/Dibkkdn/realpolitiks_mobile_apk_free.pdfIn PDF document text
    • https://xaziribubeka.weebly.com/uploads/1/3/4/3/134397614/6622411.pdfIn PDF document text
    • https://cdn.sqhk.co/xuwisagilevi/hfidFge/96401208592.pdfIn PDF document text
    • https://vemulasi.weebly.com/uploads/1/3/4/5/134509822/9718850.pdfIn PDF document text
    • https://xififaxapid.weebly.com/uploads/1/3/4/3/134344339/mesuvadegisibov.pdfIn PDF document text
    • https://roluliduz.weebly.com/uploads/1/3/4/7/134771057/lipijavoxun.pdfIn PDF document text
    • https://cdn.sqhk.co/wezopexa/djiiehg/42240176542.pdfIn PDF document text
    • https://vupubajuxik.weebly.com/uploads/1/3/4/4/134492473/batabalezow.pdfIn PDF document text
    • https://cdn.sqhk.co/bujavenizake/ihcajiG/flappy_idiot_bird.pdfIn PDF document text
    • https://cdn.sqhk.co/lasotepana/ijbgfid/52319975012.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/pesetufavo/vw_performance_parts_south_africa.pdfIn PDF document text
    • https://s3.amazonaws.com/vigevot/tapajegosadoporale.pdfIn PDF document text
    • https://s3.amazonaws.com/degagaziv/busufovakoledadapesubuza.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8cbd60c0-7186-4aa4-a396-83fd2a61d954/driving_school_2018_hack_apk_download.pdfIn PDF document text
    • https://s3.amazonaws.com/sojaxub/26764940775.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_off0000cc9b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCC9B 5680 bytes
SHA-256: 003c1e4b21c27de9ab443e855e25b4bff4dac521ddbbbd15b8a186e1cdfd763f
font_01_sfnt_off0000dfee.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFEE 10676 bytes
SHA-256: 4b650f3eabdf82da04abacd7ce15f950be620e56fe00fab9a89c17ab2284c57d

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