Malicious PDF — malware analysis report

Static analysis result for SHA-256 653ef2ffef1681ae…

MALICIOUS

PDF

76.7 KB Created: 2021-03-04 06:00:43 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-05-29
MD5: 3a80e1b4c1d05fc4a8660e034050449f SHA-1: 41b117eb41298ca179e74eeb752a79eb61c431ec SHA-256: 653ef2ffef1681aeea6fd19e57376e97d0f973e137ae4c74a45a2d76ea2d16fe
126 Risk Score

Malware Insights

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

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. It contains numerous embedded URLs, many pointing to disposable domains, suggesting a link farm or redirection scheme to distribute malicious content. The document body, though heavily obfuscated, contains text related to a school search query, likely a lure to attract victims to click on the malicious links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9991

Heuristics 5

  • 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.
  • 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://xajibur.ru/wix?keyword=francis+scott+key+elementary+school+san+francisco PDF link annotation
    • http://ca-management.website/hazel_tells_laverneen7e7.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4367640/normal_6022ade92cbbe.pdfIn PDF document text
    • http://mandarins.space/top_10_best_hd_movie_site5qlba.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4474980/normal_60278480391f6.pdfIn PDF document text
    • http://gakagebir.mypressonline.com/2012_chevrolet_impala_ss_gas_mileage.pdfIn PDF document text
    • http://xeeewq.xyz/befeforop4lsm.pdfIn PDF document text
    • http://paksorond.xyz/satellite_communication_systems_operator-maintainer6i0bw.pdfIn PDF document text
    • https://cdn.sqhk.co/vuxesojogugu/KijUHjj/pioneer_sph-_da210_wiring_harness.pdfIn PDF document text
    • http://autolombardpro.ru/how_to_hook_up_leg_pulley_on_total_gym34cln.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4469104/normal_5ff1b7b44969c.pdfIn PDF document text
    • http://jogubewuzamofet.iblogger.org/who_is_dr_myles_munroe.pdfIn PDF document text
    • http://umkatrade.ru/wugigevufukwhj2.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4419415/normal_6032aee381c99.pdfIn PDF document text
    • http://tejovotemikodes.getenjoyment.net/xepopokelugivavifubab.pdfIn PDF document text
    • https://cdn.sqhk.co/feketukadoz/hgf1gfk/10395051761.pdfIn PDF document text
    • http://apple-fruit.space/tenofavusulatexanazinjorlv.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369660/normal_6011832e9019e.pdfIn PDF document text
    • http://shop-you.xyz/today_weather_report_live_locationxuhqm.pdfIn PDF document text
    • http://naturwow.space/toy_carnival_frenzybone_quest_ragnarok_mobilewmq3l.pdfIn PDF document text
    • http://neriwor.medianewsonline.com/how_to_download_paint_in_computer.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://fakatidewejuna.epizy.com/62647026283.pdfIn PDF document text
    • http://vevodulezetom.rf.gd/como_assistir_tv_no_celular_iphone.pdfIn PDF document text
    • http://rozepon.rf.gd/baby_mine_alison_krauss.pdfIn PDF document text
    • http://satawakerexe.atwebpages.com/38719206725.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_off0000ee4b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE4B 5244 bytes
SHA-256: 194757fab0fdf7a357ddcb87d8073995b2e18a6305d07866a57736a2b5778104
font_01_sfnt_off00010001.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10001 10964 bytes
SHA-256: 2469257dcdcf7959dc56e2e07cb275838e88e146898603dd981a9cc452a20063

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