Malicious PDF — malware analysis report

Static analysis result for SHA-256 8ab355411e6b12c2…

MALICIOUS

PDF

74.6 KB Created: 2021-03-31 14:18:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-20
MD5: 7892a3c974fda655f3cb782677377a2f SHA-1: 7d8740d9deab337b31d04cc5e7fbd534d1f27d39 SHA-256: 8ab355411e6b12c20088d3171b959951428d6f791d0192c8c0ce1c859dedc37a
192 Risk Score

Malware Insights

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

The PDF contains multiple embedded URLs, with a critical heuristic firing indicating links to known malicious redirector infrastructure. The document body, though heavily obfuscated, suggests a lure related to 'California nclex rn results', aligning with phishing or scam tactics. The presence of numerous links on disposable hosting further supports a malicious intent to redirect users to harmful sites.

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
  • PDF links to known malicious redirector infrastructure critical PDF_MALICIOUS_REDIRECTOR_LINK
    PDF contains a clickable URI to redirector infrastructure used by a known malicious PDF SEO/adware delivery campaign. These documents typically rely on user interaction and redirect chains rather than a PDF parser vulnerability.
  • 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.
  • Fake invoice / payment lure low SE_INVOICE_LURE
    Document contains invoice or payment language paired with an action verb — useful context when combined with link, macro, or attachment indicators
  • 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=california+nclex+rn+results In PDF document text
    • http://musapexumuk.22web.org/tisumoguwumoxozuxu.pdfIn PDF document text
    • https://cdn.sqhk.co/someteku/WJjdBih/ultimate_car_driving_simulator_mod_apk_android_1.pdfIn PDF document text
    • http://ryursew.space/espacios_e_intercambios_vocabulairezx9pn.pdfIn PDF document text
    • http://jivopifavu.22web.org/accounting_rate_of_return_example.pdfIn PDF document text
    • https://cdn.sqhk.co/lutotilivik/QsPuggP/fafisumotek.pdfIn PDF document text
    • https://cdn.sqhk.co/nisugavu/QljfSjb/lexigozubufukapanukodoxi.pdfIn PDF document text
    • http://mivetys.xyz/house_ordered_from_sears_catalog_in_1920s_still_standing6l2nl.pdfIn PDF document text
    • http://spainsale.pro/becoming_a_supple_leopard_frds3xb.pdfIn PDF document text
    • http://pigirajeku.22web.org/zazovuvugowebirumomutos.pdfIn PDF document text
    • https://cdn.sqhk.co/puvubuzu/8gOPEs8/draw_climber_mod_ios.pdfIn PDF document text
    • https://cdn.sqhk.co/rifojimuna/hjcjgov/34132671395.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://s3.amazonaws.com/bejenosugede/circles_post_malone_piano_sheet_music.pdfIn PDF document text
    • http://wavepenaxega.epizy.com/tazakotenolejozaresij.pdfIn PDF document text
    • https://s3.amazonaws.com/budovewesekaz/pavel_tsatsouline_best_kettlebell_exercises.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/685ebbee-a859-4ba7-9872-d81fe59301d8/global_marketing_keegan_green.pdfIn PDF document text
    • https://s3.amazonaws.com/zopenave/playstation_3_remote_control_not_working.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/f15dab44-471f-4909-975a-ff17a37f2f16/garuda_puranam_full_book_in_telugu.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/63092fcb-c09b-4e20-81dc-8d375effd643/lusubivixop.pdfIn PDF document text
    • https://uploads.strikinglycdn.com/files/0d3d2d1d-0b1b-4739-b1b8-8ad79df258ac/22053156134.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_off0000e5bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5BC 4848 bytes
SHA-256: 4719fe8b4e53653d6d5c5a3de96291b18086915d659323665eef3cc3ffa26f41
font_01_sfnt_off0000f648.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF648 11444 bytes
SHA-256: f4a6a41d1e8b942575099a44be81c3e1442d4d0838cfeadddb0c83a2ebd774db

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