Malicious PDF — malware analysis report

Static analysis result for SHA-256 f9c1ba30c6cbe52c…

MALICIOUS

PDF

144.8 KB Created: 2021-03-25 15:57:36 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-25
MD5: 1d48422da665274b07dc75694d52a8b9 SHA-1: 3cce64707579ee5fb583b38a317497318c7a0fdd SHA-256: f9c1ba30c6cbe52c54b4719dd3e705b84408390d336f4cbc202f40cc5d26b3ab
186 Risk Score

Malware Insights

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

The PDF file contains a large number of external links, identified as a link farm, with many pointing to disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely phishing or malware distribution. Although no scripts were explicitly extracted, the PDF structure and numerous external URLs suggest it is designed to redirect users to potentially harmful websites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

Heuristics 6

  • 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 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.
  • 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://druttle.ru/123?utm_term=android+names+os PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4376621/normal_6022391b583b9.pdfIn PDF document text
    • https://jipoditewiwes.weebly.com/uploads/1/3/4/8/134875435/paxozepiwozerog.pdfIn PDF document text
    • https://gogabaxada.weebly.com/uploads/1/3/4/8/134852864/b397b47911.pdfIn PDF document text
    • http://changely.club/23593586807s5osh.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4459059/normal_602a83c51e35f.pdfIn PDF document text
    • http://beritox.medianewsonline.com/is_romeo_and_juliet_really_a_love_story.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4464067/normal_6015fdad03e3b.pdfIn PDF document text
    • http://yourcy.com/41104814763rzpte.pdfIn PDF document text
    • http://manamuposa.getenjoyment.net/methods_of_argumentation.pdfIn PDF document text
    • http://healthytrands.com/8845166807qxb5h.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4411479/normal_5fd1e40a0e792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366407/normal_5fe7cb8504ac8.pdfIn PDF document text
    • https://dapodufez.weebly.com/uploads/1/3/3/9/133997146/depisamofarobijitom.pdfIn PDF document text
    • http://hermidkovo.info/convert_google_play_book_to8josp.pdfIn PDF document text
    • http://zugasanuko.getenjoyment.net/proceso_de_aprendizaje_psicologia.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4460243/normal_6030245d304e0.pdfIn PDF document text
    • http://xapiduxirob.mywebcommunity.org/75017216260.pdfIn PDF document text
    • https://bikewodeganesu.weebly.com/uploads/1/3/4/5/134596115/5c8e68732a1.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4380871/normal_603fa0c64163a.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://nujebij.onlinewebshop.net/factoring_quadratic_polynomials.pdfIn PDF document text
    • http://roveramo.atwebpages.com/hewlett_packard_8600_printer_manual.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_off0001fc26.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1FC26 4928 bytes
SHA-256: 12f861a706e54dcbe2c03cc6ba6957988a527d9c238d6889ec11662082e568f9
font_01_sfnt_off00020ccc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x20CCC 12108 bytes
SHA-256: 634f17bc10408923febea0f46877be2aa1b77910de8b6625f47cfabf25c24d23

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