Malicious PDF — malware analysis report

Static analysis result for SHA-256 4749797025a542c2…

MALICIOUS

PDF

69.9 KB Created: 2021-02-16 23:21:12 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-06-17
MD5: 77b5fd0e5cee2811b982798f95280eaf SHA-1: e3c7fa4dd10df6f19607da3b3f01db3320976076 SHA-256: 4749797025a542c2cc12febc2b85329806c244587874768d490b7ae71b3ca161
126 Risk Score

Malware Insights

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

The PDF contains multiple external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URLs point towards a malicious document designed to redirect users to potentially harmful websites.

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
  • 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.
  • 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://jacksth.ru/123?utm_term=maxwell+medical+reference+pdf PDF link annotation
    • https://static.s123-cdn-static.com/uploads/4495988/normal_5fc8054cc22b9.pdfIn PDF document text
    • http://winnerslm.space/is_flixtor_still_downo81ws.pdfIn PDF document text
    • http://b4shop.icu/kenujudapasopazifenirxd07c.pdfIn PDF document text
    • https://josebugovoje.weebly.com/uploads/1/3/0/7/130738719/kafanulimi_kegaruvabug_vewupavimi.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4424666/normal_5fc99762c7909.pdfIn PDF document text
    • https://jodajapiguzok.weebly.com/uploads/1/3/2/7/132710756/ced0b998b243e.pdfIn PDF document text
    • https://fuvapele.weebly.com/uploads/1/3/0/7/130738919/nedatanutuzikerot.pdfIn PDF document text
    • http://circus.market/elton_john_love_songs_tracklist3grwx.pdfIn PDF document text
    • http://drilltech.info/beamer_presentation_template_freeu718h.pdfIn PDF document text
    • http://study-english-05.site/jekejixisinilesisefln81t.pdfIn PDF document text
    • https://pukutititoj.weebly.com/uploads/1/3/1/3/131383613/79b9b37a053ac.pdfIn PDF document text
    • https://puviguwa.weebly.com/uploads/1/3/0/7/130776677/969f4.pdfIn PDF document text
    • http://m-ryanaf.site/rumonimenafat9he2q.pdfIn PDF document text
    • http://8gusevshop.website/bible_quiz_in_tamil_with_answersu7v7f.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4380078/normal_5fcb11b52f25c.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/xulepiwa/39814230851.pdfIn PDF document text
    • https://s3.amazonaws.com/vidadaviwal/100_egyptian_cotton_sheets_800_thread_count.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_off0000d26c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD26C 5288 bytes
SHA-256: dd49c3c27696d02ac3a2f583efe9a8f4b8bffd73b411fb2109dde9c10bf298fc
font_01_sfnt_off0000e478.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE478 11272 bytes
SHA-256: 12f654bb2e66dd24755b3ceb7531f900b913f17bdfd2bfae23f058e7e17b56c3

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