Malicious PDF — malware analysis report

Static analysis result for SHA-256 5dc4e29abd5eb048…

MALICIOUS

PDF

112.1 KB Created: 2021-03-20 04:12:51 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 86878481ab860f861acc30b0d247a569 SHA-1: dd2a95495a81ca71593a94b57a5985401bc996a0 SHA-256: 5dc4e29abd5eb048b4b75398d053c83067648d5233867051d380e8826e11707d
156 Risk Score

Malware Insights

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

This PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains a large number of external links, with one suspicious URL pointing to 'jacksth.ru'. This suggests the document is likely used for SEO manipulation or phishing, attempting to redirect users to potentially harmful websites. No scripts were extracted, but the presence of numerous links is a strong indicator of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM
    Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • 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://jacksth.ru/wix?keyword=stellaris+psionic+ascension+path
    • https://cdn.sqhk.co/lamijaluxeso/g0jdhdp/67449536982.pdf
    • http://uablog.website/kusin5n6kw.pdf
    • https://cdn.sqhk.co/miviterul/kibhhgd/40021596487.pdf
    • https://cdn.sqhk.co/soziwariru/lGhhe0P/84017655169.pdf
    • https://cdn.sqhk.co/nanovinojon/jimjfcY/barbecue_restaurant_near_me_that_delivers.pdf
    • http://italysummer.fun/32959844981wp4yq.pdf
    • https://cdn.sqhk.co/zisenusaf/edjj9zJ/tank_stars_para_pc.pdf
    • https://cdn.sqhk.co/funixatugesi/hjhcAK5/dofusomesoziwoxizosevuv.pdf
    • http://djami.ru/fanatical_football_mod_apkk8mmw.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://d25e5d79-f3dc-43ab-8538-58f2f4730235.filesusr.com/ugd/898300_fa14b27bc28248e089d5566d891916aa.pdf?index=true
    • https://73c25812-7308-4b32-b985-10e2a25710ca.filesusr.com/ugd/5b604d_f31e652f59794345a473e029cf81b773.pdf?index=true
    • https://uploads.strikinglycdn.com/files/82180dd6-3091-4031-9396-df8f479f5561/lexmark_prospect_pro205_reset_ink_levels.pdf
    • https://f904ef53-caa1-4f0f-8a97-c50675c03ece.filesusr.com/ugd/2f8cea_b9b86883164e4fbea46613300c6bc969.pdf?index=true
    • https://uploads.strikinglycdn.com/files/23c79c3e-b9e0-40e0-a630-ac61fd4fbf5f/86900203897.pdf
    • https://bd15da75-ee01-4ad3-8b22-4778d9929f37.filesusr.com/ugd/1abc29_dbb2af79c936449ba33593e653dc3859.pdf?index=true
    • https://uploads.strikinglycdn.com/files/261015f5-906e-4a05-895e-861a859cefee/schwinn_fitness_130_upright_bike_assembly.pdf
    • https://uploads.strikinglycdn.com/files/65401f31-a48c-435b-b5e4-e0e029c3d311/65268572117.pdf
    • https://uploads.strikinglycdn.com/files/55c1c7c2-e3b6-49ac-b4b3-62e1469eb4ac/jazitas.pdf
    • https://uploads.strikinglycdn.com/files/cf60719b-a8a2-471e-ae13-d74a48e01b6a/what_do_i_need_for_real_id_in_ak.pdf
    • https://uploads.strikinglycdn.com/files/1ffbc6d3-bbe0-4f4b-8bef-cafcb1c0f7a5/python_3.6_free_download_for_windows_10_64_bit.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_off00017bf5.bin
61f35b59d23a16e9e4a721507703427a2063eb524ec557109add59be9a82275d		 pdf-font-stream PDF embedded font (sfnt) at offset 0x17BF5 5124 bytes
font_01_sfnt_off00018d56.bin
9dcfd403fe4125473646e6a9e8e9c1327598ff68ad1aad290ffe7a722408c128		 pdf-font-stream PDF embedded font (sfnt) at offset 0x18D56 11048 bytes

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