Malicious PDF — malware analysis report

Static analysis result for SHA-256 dc5dce96ab44ef05…

MALICIOUS

PDF

102.4 KB Created: 2021-04-09 23:05:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-24
MD5: c8e911dee9d468aea74ea6688e912819 SHA-1: e5e1f9fc8722ac297057011c52ff79ea59d067cd SHA-256: dc5dce96ab44ef05ab253fb65ab755d866f5ceb27cfd6044d701eb3058647eb1
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm designed to obscure the ultimate destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent to redirect users. The ClamAV detection and ML classifier further confirm the malicious nature of the file, likely serving as a phishing lure or a downloader for further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • Urgency / deadline lure low SE_URGENCY_LURE
    Document contains urgency or deadline language ('account will be terminated', 'action required within 24 hours', etc.) — useful context, but low-signal without other findings
  • 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://golowaki.ru/strik?utm_term=denon+avr-591+remote+app PDF link annotation
    • http://rodisawikikofu.medianewsonline.com/56035913957.pdfIn PDF document text
    • https://noparageselex.weebly.com/uploads/1/3/1/8/131856757/3985551.pdfIn PDF document text
    • http://xidasetetobuge.scienceontheweb.net/what_is_the_sign_of_the_enthalpy_change_involved_in_this_reaction.pdfIn PDF document text
    • https://cdn.sqhk.co/pitewomepe/bdYgihg/dark_forest_ruins_minecraft.pdfIn PDF document text
    • https://cdn.sqhk.co/zotofoza/ziajfPe/virus_on_my_iphone_xr.pdfIn PDF document text
    • http://tukomibewi.getenjoyment.net/allure_of_the_seas_itinerary_2020.pdfIn PDF document text
    • http://organize.shop/bazanotanevodib6sj0.pdfIn PDF document text
    • https://foxanebipukete.weebly.com/uploads/1/3/4/3/134309218/vusenetimigik-piguxop-bopirusujapumo.pdfIn PDF document text
    • http://olx-delivery.cc/dajajeyugwz.pdfIn PDF document text
    • https://zuwexonoporij.weebly.com/uploads/1/3/5/3/135317719/zoxifimusafiku_nusavun.pdfIn PDF document text
    • https://cdn.sqhk.co/ludozenidi/ejg8QEX/29280767026.pdfIn PDF document text
    • http://reduslim-shopofficial.site/kinds_of_pvc_pipe_fittingscsl71.pdfIn PDF document text
    • https://cdn.sqhk.co/madagijoj/hgiehag/spirit_run_book_summary.pdfIn PDF document text
    • https://kemudebudejel.weebly.com/uploads/1/3/4/7/134718551/089c533e3b36.pdfIn PDF document text
    • https://cdn.sqhk.co/josipinu/icujjjg/nuvizavojo.pdfIn PDF document text
    • http://bisibometixo.mywebcommunity.org/38501623726.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/2d4ade11-77e7-4695-a9a5-767d925c5f4b/kanozojiriwigawop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/58105d9a-a3d8-4e51-afec-a28a2e52bcea/python_3_range_invalid_syntax.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/8958f053-5795-435e-8afd-0ff05291d31d/pearl_jam_nothing_man_tab.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_off000159e4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x159E4 5176 bytes
SHA-256: 2bf68d2512e9a4792d8b3932253d0d25f474e7f31bbb925e11a8995819e09cda
font_01_sfnt_off00016b85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x16B85 9792 bytes
SHA-256: f21b6204577ca62780ecf40d114e3c4525af9b1a86dcd3f0e8926708a1c9cefe

Open this report in the interactive analyzer, or submit your own file for analysis.