Malicious PDF — malware analysis report

Static analysis result for SHA-256 9355102359e17e96…

MALICIOUS

PDF

105.3 KB Created: 2021-04-09 02:03:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: c4f6ac843637baedb47f7def2d6bebb1 SHA-1: 50a183379fc43c537af47a9b4857a74f9bda2740 SHA-256: 9355102359e17e96f8e876aa74bdfd903559771bfdd35eea1dbfd3dac16dfff9
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, with one specifically pointing to a domain associated with malicious activity ('dafemum.ru'). The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the ML classifier output strongly indicate malicious intent. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest this PDF is designed to redirect users to potentially harmful content, likely for phishing or malware 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://dafemum.ru/strik?utm_term=vitamix+recall+5200+costco
    • https://cdn.sqhk.co/xelalizogim/XUToUTY/kugaxokotipuditememopuje.pdf
    • https://mixosikopas.weebly.com/uploads/1/3/4/3/134383158/6337660.pdf
    • http://fedezin.scienceontheweb.net/wezoxurexev.pdf
    • http://jerugujekema.getenjoyment.net/add_text_to_document_on_mac.pdf
    • http://potuduwatolebu.mywebcommunity.org/alveoloplastia_dental.pdf
    • https://tokuzulovaw.weebly.com/uploads/1/3/0/7/130740221/333a5fae167b.pdf
    • https://cdn.sqhk.co/togokitaz/isjbhjG/16211607181.pdf
    • https://fanevatonalusi.weebly.com/uploads/1/3/1/6/131637928/df2468c.pdf
    • http://vakodilaxen.iblogger.org/fukokofir.pdf
    • https://pegufozexak.weebly.com/uploads/1/3/5/3/135317465/8cf2b5.pdf
    • http://jiwapadenejeza.getenjoyment.net/bitcoin_price_today.pdf
    • http://xubajur.mygamesonline.org/black_swan_books_oakland.pdf
    • https://daxefumusadaja.weebly.com/uploads/1/3/4/7/134763928/busajagerul_kexogukola.pdf
    • https://cdn.sqhk.co/sotatixorawi/jhskVgd/70763445397.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://s3.amazonaws.com/xutomoxu/cradle_mountain_summit_guided_walk.pdf
    • http://kakasis.onlinewebshop.net/69605665487.pdf
    • https://s3.amazonaws.com/topipovikapari/92671147016.pdf
    • http://tiluxusimutine.atwebpages.com/captain_underpants_and_the_sensational_saga_of_sir_stinks-a-lot_the_twelfth_epic_novel.pdf
    • https://s3.amazonaws.com/nitajosasa/cfms_annexure_2a_form.pdf
    • http://tanonarimunal.myartsonline.com/roxej.pdf
    • https://s3.amazonaws.com/daniwodug/78788836261.pdf
    • http://mexokibalu.epizy.com/fiwitiwaremativuxasu.pdf
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#
    • http://purl.org/dc/elements/1.1/
    • http://ns.adobe.com/pdf/1.3/
    • http://ns.adobe.com/xap/1.0/
    • http://ns.adobe.com/xap/1.0/mm/
    • http://ns.adobe.com/xap/1.0/rights/
    • http://scripts.sil.org/OFL
    • http://dejavu.sourceforge.net
    • http://dejavu.sourceforge.net/wiki/index.php/License

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00014055.bin
695c23a598a304bcd9b4aa72d9fc991233710a162bfa9b660db205a071573397		 pdf-font-stream PDF embedded font (sfnt) at offset 0x14055 5376 bytes
font_01_sfnt_off00015291.bin
f6010bb6260622e73796d7aa8ee8ae16581fb43bd6a4ddfb1358f6dc22c8b6ae		 pdf-font-stream PDF embedded font (sfnt) at offset 0x15291 16464 bytes
font_02_sfnt_off00018278.bin
a994b4637e3273058e83df3c2e65ec0dffd4bf461f53263e104c54270a92fa24		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18278 16140 bytes

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