Malicious PDF — malware analysis report

Static analysis result for SHA-256 3eadfe2c1a8f88ad…

MALICIOUS

PDF

83.9 KB Created: 2021-04-05 03:21:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: fc0e9c245e214de192329165d757ab36 SHA-1: b6b2eab64abc63e81deeb1c0b27095f4e70e8565 SHA-256: 3eadfe2c1a8f88adf3d9a8c435fac4abb24df829878e86ae90cabe20f9bfb8da
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript T1203 Exploitation for Client Execution

The PDF document contains a fake CAPTCHA lure, a common technique to trick users into executing further malicious actions. It also includes numerous external URIs, with one pointing to a known malicious domain, suggesting it's part of a phishing campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to download and execute a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9997

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA
    Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
  • 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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://botokaw.ru/wix?keyword=dragon+ball+z+dokkan+battle+hack+no+verification+required
    • https://janogawe.weebly.com/uploads/1/3/0/7/130776821/naletoxadivixew.pdf
    • http://newuwedeza.mypressonline.com/mavufura.pdf
    • http://mamontov-net.cc/4147447733151938.pdf
    • http://resipowepo.getenjoyment.net/general_building_construction_book.pdf
    • https://nepunifanod.weebly.com/uploads/1/3/4/5/134524507/4829641.pdf
    • http://mantenancie.com/play_4_number_connecticut_lottov6axs.pdf
    • https://nugilura.weebly.com/uploads/1/3/5/3/135317706/3669687.pdf
    • http://xidakuxekon.22web.org/osha_safety_standards_for_machinery.pdf
    • http://gachihyper.xyz/28847812119sdkmt.pdf
    • http://ukrdomonis.xyz/char_broil_grill_cover_home_depot8kdxx.pdf
    • http://jokojevuwurepip.22web.org/75545185753.pdf
    • http://tokudujadi.medianewsonline.com/problemas_con_angulos_de_elevacion_y_depresion.pdf
    • https://senaduwofajix.weebly.com/uploads/1/3/0/7/130775021/wovaliz_jumaraxaveniri_somalurubob.pdf
    • http://oneitstore.info/yard_machine_snow_blower_spark_plug_sizewgrs4.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • http://bumurulepowele.myartsonline.com/retinopatia_hipertensiva_definicion.pdf
    • http://livirava.atwebpages.com/xonorosawiwo.pdf
    • http://juzapurul.onlinewebshop.net/95448962017.pdf
    • http://lavebaku.rf.gd/11816851667.pdf
    • http://xekamala.epizy.com/66807589844.pdf
    • http://litezopufesox.epizy.com/sifipufatixo.pdf
    • http://dumudolaba.epizy.com/58222321350.pdf
    • http://moxorusik.epizy.com/biopsy_procedure.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_off0001083e.bin
1b28930184175d255e971dc76b0a3aec7cc7a90d17a69d471f26490f9013c617		 pdf-font-stream PDF embedded font (sfnt) at offset 0x1083E 5544 bytes
font_01_sfnt_off00011b24.bin
49548c16b6c728431ae6ae4495b93d25fc313d5e7a8d9e1abf7f2e8359da2a45		 pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 11296 bytes

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