Malicious PDF — malware analysis report

Static analysis result for SHA-256 42828ba60d2c7315…

MALICIOUS

PDF

81.7 KB Created: 2021-04-07 19:45:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: d2d7286c4c14aec521f7584bfc613c41 SHA-1: bab5008fc71f62670239f0954693b48b2266bc18 SHA-256: 42828ba60d2c7315b280047044f2173a31091b339a5ac40020ce3440d06f91f2
126 Risk Score

Malware Insights

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

The PDF contains an embedded URI pointing to a suspicious domain, identified by heuristics as a link farm and flagged by ML classifiers and ClamAV as malicious phishing content. The document body, though heavily obfuscated, appears to reference 'Ti 89 calculator online', suggesting a lure to a phishing site. The presence of external URIs and the overall detection profile strongly indicate a phishing attempt.

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://xezojetit.ru/strik?utm_term=ti+89+calculator+online
    • http://warupipujamoru.sportsontheweb.net/64184409011.pdf
    • https://static.s123-cdn-static.com/uploads/4458145/normal_5fe011cbd9721.pdf
    • https://cdn-cms.f-static.net/uploads/4457320/normal_602ec5a34bba0.pdf
    • https://static.s123-cdn-static.com/uploads/4475208/normal_5feed917a7dd0.pdf
    • https://cdn.sqhk.co/sozodumupof/iYjaidt/youtube_studio_customize_channel.pdf
    • http://jonebosu.mywebcommunity.org/capture_nx_d_manual.pdf
    • http://japarof.mywebcommunity.org/how_to_get_ready_to_run_a_half_marathon.pdf
    • https://static.s123-cdn-static.com/uploads/4385880/normal_5fefaa3a97685.pdf
    • http://kusufuxufatup.getenjoyment.net/70252381088.pdf
    • https://cdn.sqhk.co/rosisole/gNijAhi/zakemisuwijerun.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://uploads.strikinglycdn.com/files/be4c2309-6be9-46a8-ae96-ebee16078237/buwedesonaramavujod.pdf
    • https://uploads.strikinglycdn.com/files/2be50fc0-7a7f-486d-87f3-ac9bf4aa1327/xuverazomuza.pdf
    • https://s3.amazonaws.com/duzexefemosaxe/fast_typography_template_free.pdf
    • https://uploads.strikinglycdn.com/files/66b57ce1-5456-47f8-8071-61d85081858e/87512412715.pdf
    • https://uploads.strikinglycdn.com/files/5100ed72-6525-41d4-8165-2089dcd28749/what_kind_of_batteries_does_a_ti_84_take.pdf
    • https://s3.amazonaws.com/xabalaru/luxusaxikikazezil.pdf
    • https://s3.amazonaws.com/fezenur/book_opening_animation_free.pdf
    • https://uploads.strikinglycdn.com/files/368b24fa-6521-4061-9053-f0132aa1a6d2/best_55_inch_samsung_smart_tv.pdf
    • https://uploads.strikinglycdn.com/files/13b844d1-40f3-4fa5-b5a3-0e473ba9a5a1/how_do_i_return_my_verizon_router.pdf
    • https://s3.amazonaws.com/jazuravazaguz/91603627949.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

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off00010364.bin
9e539031d19a0cc8d89b815ebf0cc345edce1daef491aacb140972c35e858739		 pdf-font-stream PDF embedded font (sfnt) at offset 0x10364 4916 bytes
font_01_sfnt_off00011427.bin
a210488ddd74f8e1ded9af1a251c66364a42f8c1d9ee7020822131f3d28f240e		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11427 10908 bytes

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