Malicious PDF — malware analysis report

Static analysis result for SHA-256 57992dc0069ee8ad…

MALICIOUS

PDF

97.6 KB Created: 2021-05-09 04:28:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-08-25
MD5: 644fc0ee8de2b9d8b3ddbaf0213208e6 SHA-1: dac7662d0823ec1045cba069ca940cf0f32f7acc SHA-256: 57992dc0069ee8ad7857b668efef0370514e4cff8f8ce75b902f943969208268
186 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. It contains a large number of external links, many pointing to disposable domains, suggesting a link farm used for phishing or malware distribution. The presence of external URIs and the overall structure strongly suggest the document is designed to redirect users to malicious sites, likely as part of a spearphishing campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9970

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
  • 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.
  • 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://dugedepap.ru/strik?utm_term=wordpress+user+role+editor PDF link annotation
    • http://kulotufiw.mypressonline.com/70142042935.pdfIn PDF document text
    • http://rujisuki.mygamesonline.org/elgato_game_capture_card_hd60_s_switch.pdfIn PDF document text
    • https://cdn.sqhk.co/ladesajisama/ihbgejg/pulse_oximeter_covid_test.pdfIn PDF document text
    • https://cdn.sqhk.co/tisewesir/RijgGgc/35782905268.pdfIn PDF document text
    • https://cdn.sqhk.co/xusopusavo/qifhbFO/among_us_mod_menu_android_download.pdfIn PDF document text
    • http://gewusoluxul.scienceontheweb.net/administrao_da_produo_e_operaes_download.pdfIn PDF document text
    • https://cdn.sqhk.co/tixunudixa/b4gcxje/best_free_notepad_app_for_windows.pdfIn PDF document text
    • https://cdn.sqhk.co/vilubofi/kjds4jj/78013787371.pdfIn PDF document text
    • http://nunejabu.scienceontheweb.net/94953055531.pdfIn PDF document text
    • https://cdn.sqhk.co/xokebuzizo/hdjidu5/dolabolo.pdfIn PDF document text
    • http://woziwowariv.sportsontheweb.net/52291260234.pdfIn PDF document text
    • http://wamipivifubape.sportsontheweb.net/lesoes_precursoras_do_cancer_de_colo_de_utero.pdfIn PDF document text
    • http://kokulotasuz.mygamesonline.org/dajumili.pdfIn PDF document text
    • https://cdn.sqhk.co/gopuxipo/aaN61FU/best_heartbreaking_thoughts.pdfIn PDF document text
    • https://cdn.sqhk.co/pexudolifa/hjhbjhw/15547344109.pdfIn PDF document text
    • http://siwivelijutore.medianewsonline.com/papetowenajajule.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/nosepevozux/gst_calculator_for_windows_10.pdfIn PDF document text
    • http://zukomakiduw.myartsonline.com/musemefi.pdfIn PDF document text
    • https://11ab4cf5-156d-4417-99e9-5039b2a7eb5f.filesusr.com/ugd/82d61e_b43e2022736c41be86b2e0e97e27a97a.pdf?index=trueIn PDF document text
    • https://4eb3a9b5-ca6a-4b2a-896e-878abc754f3b.filesusr.com/ugd/f1ab86_2dcebe6835b940fd87c694986ab5088a.pdf?index=trueIn PDF document text
    • https://b32521b7-32ca-447e-9967-d27d0dce683d.filesusr.com/ugd/800b88_8d92d82403f44d079c7f74fd7dc52577.pdf?index=trueIn PDF document text
    • https://ede8a7a3-2377-4e09-926a-401222b31c25.filesusr.com/ugd/81c89d_ef6ed8bd7d6a463a9c5c2c0bd48aca4b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lofese/eldest_christopher_paolini_movie.pdfIn PDF document text
    • https://s3.amazonaws.com/levumoduf/how_much_does_a_full_motorcycle_service_cost.pdfIn PDF document text
    • https://56352102-112a-4456-a677-0775450c4ed3.filesusr.com/ugd/ed4e87_7c4039ede66e401a9d7055f86e82ccb1.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/saziwijaxodav/8913826004.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_off00013f3c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13F3C 4756 bytes
SHA-256: 97a50ba0ce094621fa015fb09f1a202e204c517e6578ca2e66a363b73a447ce7
font_01_sfnt_off00014f85.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14F85 12516 bytes
SHA-256: ddd087c88af256603eb85099155ddb2bc583223e2e45501708166bca5d160a44