Malicious PDF — malware analysis report

Static analysis result for SHA-256 52caea0627e0ccc4…

MALICIOUS

PDF

69.7 KB Created: 2021-02-21 23:58:17 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: f0515e27b6ef40ff98f1ae2854c4b886 SHA-1: 967d15eee60b438412eab7b9c2c0a4a1c561199b SHA-256: 52caea0627e0ccc45c3f905a4a4a4c35c064cddf535986b6f44d702815899c79
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains multiple embedded URLs, with one pointing to 'jacksth.ru' and another to a Weebly-hosted PDF, suggesting a lure to a malicious site. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the PDF is part of a link farm on disposable hosting, further supporting a phishing or malicious redirection scheme.

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
  • 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=research+design+qualitative+quantitative+and+mixed+methods+approaches+3rd+edition+pdf PDF link annotation
    • https://migokenumepo.weebly.com/uploads/1/3/1/4/131454620/rejewerifero.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4390051/normal_5ff65a88d67f0.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4478393/normal_5fc9a16f49cc0.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4458148/normal_6015420f0bd4a.pdfIn PDF document text
    • https://muvanuxeb.weebly.com/uploads/1/3/4/0/134096654/zasadiveje-guxole-ruzizoraxax-midudevorivi.pdfIn PDF document text
    • https://sosedegif.weebly.com/uploads/1/3/2/8/132815053/lutarolu_muwuxotisadori_fanoliva_dimaviborejaje.pdfIn PDF document text
    • http://look-hotel.com/email_address_format_rfcd0q77.pdfIn PDF document text
    • https://wedidosav.weebly.com/uploads/1/3/1/6/131637371/tumam_kotopavid.pdfIn PDF document text
    • https://gatudawi.weebly.com/uploads/1/3/1/3/131379110/1890650.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/xanunafojuloki/55479261004.pdfIn PDF document text
    • http://dajaxul.epizy.com/jadifuza.pdfIn PDF document text
    • https://s3.amazonaws.com/xurixado/link_s_awakening_eagle_tower_guide.pdfIn PDF document text
    • https://s3.amazonaws.com/purixifusipelid/free_english_worksheets_for_year_2.pdfIn PDF document text
    • http://pazutoxun.epizy.com/startup_business_plan_template_word_free.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_off0000d113.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD113 5992 bytes
SHA-256: cd60ecc2a93e7ec5b9d269256eb1a9b272b6f975c540753a82c434384d389d55
font_01_sfnt_off0000e560.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE560 10492 bytes
SHA-256: 0b341d2423b71ff75bfc034bb9a5f5368b54a582b62fa4f5999a9d7dea75fa9e