Malicious PDF — malware analysis report

Static analysis result for SHA-256 da36798656fc5115…

MALICIOUS

PDF

77.0 KB Created: 2021-03-19 11:00:13 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-20
MD5: 5ff41f7d88b0fef6f20aa6efce5a181c SHA-1: 21ea7ea59b25f70e867b0a1c5484a571a4a3da52 SHA-256: da36798656fc51159b2ff4b1e495edc7da84bf5e32691c1d92f6017e32a33f4a
126 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

The sample is a PDF document that contains numerous embedded URLs, many of which point to disposable hosting or link farms, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of techniques used to redirect users to malicious sites, likely for credential harvesting or further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9996

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://leonvi.ru/wix?keyword=snack+tectonics+worksheet PDF link annotation
    • http://fibutogu.mywebcommunity.org/pofarixunibuxerizizib.pdfIn PDF document text
    • https://noripuluse.weebly.com/uploads/1/3/5/9/135957130/6950e8a629c.pdfIn PDF document text
    • https://fugowekarulosom.weebly.com/uploads/1/3/4/7/134700114/tagixumutozodugu.pdfIn PDF document text
    • http://subbellassecret.com/7988337813700pc8.pdfIn PDF document text
    • http://wapividazofar.scienceontheweb.net/95743442601.pdfIn PDF document text
    • http://healthit.space/aarp_medicare_provider_manualagh9f.pdfIn PDF document text
    • https://cdn.sqhk.co/tuledapozato/fUIAKie/73215033029.pdfIn PDF document text
    • https://cdn.sqhk.co/xoresarib/HP6T1ja/best_cyber_monday_laptop_deals_on_amazon.pdfIn PDF document text
    • http://sosyaltakipcipanelin.com/sevapigapuminunevix800xt.pdfIn PDF document text
    • http://8gusevshop.space/poweraudio_pro_music_player_reviewi2ktk.pdfIn PDF document text
    • http://xijulefabogi.getenjoyment.net/sinejugusadizuxulufe.pdfIn PDF document text
    • https://zogugixuwomu.weebly.com/uploads/1/3/4/2/134234599/zusop_ditilurutotud_vonetafizu_zivobefevebijuv.pdfIn PDF document text
    • http://migerov.xyz/aqa_spanish_gcse_examiners_report_2018gwpnu.pdfIn PDF document text
    • http://uspehdnyaaxyz.xyz/30497776351v58a4.pdfIn PDF document text
    • http://xsafak.com/ikea_cyber_monday_couponsthr0.pdfIn PDF document text
    • https://cdn.sqhk.co/penuvipaw/ehijevo/swot_england_meaning.pdfIn PDF document text
    • https://gugagefa.weebly.com/uploads/1/3/4/3/134343265/8513843.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://uploads.strikinglycdn.com/files/0de3d121-b67e-4d7e-aa83-6e6dfd5d1980/51827938479.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/791b511f-9e5c-4014-9237-8dc19cd7e545/11279081157.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/788924e2-3495-4947-bf0b-744956ada677/54345193426.pdfIn PDF document text
    • http://tarepos.onlinewebshop.net/16838533048.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/ca6fa703-1b94-4f5a-b102-8cd50f451ec8/introduction_to_psychology_exam.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_off0000f205.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF205 5112 bytes
SHA-256: 34b8d9f45ac9b7cd0ea75d3b35e834d644eeb8cda1d41615c48fcc5b8a331509
font_01_sfnt_off00010379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10379 10288 bytes
SHA-256: 179475cccb57f3b0d1a7127169243374c4cdabcfa5d82d10d3d3672546795c99

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