Malicious PDF — malware analysis report

Static analysis result for SHA-256 d7420dbde7f4184b…

MALICIOUS

PDF

84.5 KB Created: 2021-03-21 04:07:15 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-11-22
MD5: 644b8c243c6916ac181d1ba32553156f SHA-1: bf65caf7c0f25f93700122dfb84d8635180e3c4d SHA-256: d7420dbde7f4184b8c2ebadc96f2bfd3571c369d14c41b58b64eb002258bdba8
126 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many pointing to disposable domains, and is flagged by ML classifiers and ClamAV as malicious phishing content. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a large number of links on disposable hosting, suggesting an attempt to distribute malicious content or phish for information. The primary malicious URL identified is https://midufefew.ru/strik, which is likely used to deliver a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9995

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://midufefew.ru/strik?utm_term=arkansas+driving+permit+restrictions PDF link annotation
    • http://pazadixokumox.sportsontheweb.net/casio_tough_solar_g-shock_watch_reviews.pdfIn PDF document text
    • http://reduslim-official.website/pioneer_vsx-1020-k_7.14j0wc.pdfIn PDF document text
    • http://nugawijuxuv.mywebcommunity.org/kptcl_recruitment_2020_notification.pdfIn PDF document text
    • http://fukikenikiru.22web.org/9490520919.pdfIn PDF document text
    • http://lirerigoteses.22web.org/snt-_tc-_1a_2006.pdfIn PDF document text
    • http://creditreportus.info/how_to_pair_viper_ds4_to_phoneup9mg.pdfIn PDF document text
    • http://bathforlegs.xyz/para_que_sirve_el_shot_de_jengibre_y_curcumachhfo.pdfIn PDF document text
    • http://zubiki.top/time_management_skills_for_managersdhqd3.pdfIn PDF document text
    • http://itawegan.fun/megohmmeter_user_manualspyp4.pdfIn PDF document text
    • http://lg-copyrightforms.com/if_a_guy_really_likes_you_he_will_pursue_youfshfd.pdfIn PDF document text
    • http://goxivomibivufuv.mywebcommunity.org/72820837178.pdfIn PDF document text
    • http://powerhdniy.space/who_said_absolute_power_corrupts_absolutely_quotebg9o5.pdfIn PDF document text
    • http://13millions-warzone.store/schwinn_stationary_bike_170_manualaska3.pdfIn PDF document text
    • http://shortsomfj.space/how_to_use_a_brinkmann_smoke_n_grillfc9j7.pdfIn PDF document text
    • http://online-bestshop.xyz/free_download_autocad_for_students_and_educators_autodeskqytsv.pdfIn PDF document text
    • http://nijepatexosanus.medianewsonline.com/nobakaxexu.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://www.daltonmaag.com/In PDF document text
    • https://3b044092-e341-4c69-a8e2-52b14fc1865f.filesusr.com/ugd/370021_494ca61811b846aab937495b57cbc239.pdf?index=trueIn PDF document text
    • https://51f47fa2-20f7-4ec4-bb91-8ae4aee689b4.filesusr.com/ugd/917232_d8dd6963ba19404286770b730c33cd81.pdf?index=trueIn PDF document text
    • https://917ed8d3-8a9f-4c5c-a3ad-554e533308ad.filesusr.com/ugd/a4e402_702d7a357a36403b9439b3b1810f6699.pdf?index=trueIn PDF document text
    • https://1c92f6d8-19eb-429c-9239-1cf6be91372f.filesusr.com/ugd/cc1a03_6b015044b1aa4480883046d8fd092d1a.pdf?index=trueIn PDF document text
    • https://9fbaa0db-fe9e-443e-b503-3d02ea494c21.filesusr.com/ugd/d417e9_92948975365a43dbaf66e907dfb4aab7.pdf?index=trueIn PDF document text
    • https://770ad53b-b55e-4e58-b1eb-3709f41304f7.filesusr.com/ugd/98e298_cd71b89e6af74a99beda9dea600238e6.pdf?index=trueIn 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 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000ff16.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF16 5264 bytes
SHA-256: 9576ceca0f799581fa3b1790ae943912d28752afd68dac05b26053dc8df21397
font_01_sfnt_off000110e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110E0 10956 bytes
SHA-256: 2ac1a0f56e14c11c13a447ed696e948d624e325128791225cef0e51e8daf323d
font_02_sfnt_off00013650.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13650 4324 bytes
SHA-256: 9f355172d696dda274cac500966718f112ce76951f19577ac4888987ea6471b2