Malicious PDF — malware analysis report

Static analysis result for SHA-256 be65ed6bcb150e4c…

MALICIOUS

PDF

69.9 KB Created: 2021-03-23 12:35:21 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-23
MD5: 0257f8847adbf2ee478bdfac8edaf8cb SHA-1: 116d604339bd28b497767e559643f71a60580ab5 SHA-256: be65ed6bcb150e4cb54e5a90f0df874f04ea65a672923fff89f07c4a19323cee
134 Risk Score
Tags
free-cdn-ebook-manual-lure

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

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
  • 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
  • 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://vilenefex.ru/strik?utm_term=the+sun+rises+in+the+morning+transitive+or+intransitive PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4417139/normal_602b43e6a7126.pdfIn PDF document text
    • http://sodahub.pro/chicken_soup_for_the_teenage_soul_2_read_onlinex75gp.pdfIn PDF document text
    • http://pedron.fun/28480355109mye3q.pdfIn PDF document text
    • http://wisecredit.info/gabolopuzfcsc2.pdfIn PDF document text
    • http://valigulepi.scienceontheweb.net/frederick_copleston_history_of_philosophy_set.pdfIn PDF document text
    • http://garant-ritual.online/nekelk15d9.pdfIn PDF document text
    • https://relorurexo.weebly.com/uploads/1/3/5/3/135391300/f0602a23c95fa83.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4378175/normal_60395e02d0068.pdfIn PDF document text
    • https://xepekozodixati.weebly.com/uploads/1/3/5/3/135346226/3131792.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4379384/normal_602dad79d3c31.pdfIn PDF document text
    • https://gijesetezoludad.weebly.com/uploads/1/3/5/3/135348421/beafb5ab7507704.pdfIn PDF document text
    • http://zabavnyi-slon.ru/1211157594upjvw.pdfIn PDF document text
    • http://romeita.space/finish_the_lyrics_disney_with_answerstxytb.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://wejufutaz.onlinewebshop.net/solving_equations_word_problems_worksheet.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/09649206-c026-4ca4-890e-e9c246bd93e2/how_to_use_scanner_on_hp_deskjet_2545.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0e49ff8d-f3ab-4167-be65-aeffeec37079/lilaweg.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_off0000d5c8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C8 5076 bytes
SHA-256: c68282bae8b233cdeb01242c9514f1b5ae34a6b01c790750a88dd5099617ce94
font_01_sfnt_off0000e6e3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE6E3 10280 bytes
SHA-256: a468f9461753ad5fc1c5ef8e446c4e33daf68f0b9a5aa79f84abc46203549d8f

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