Malicious PDF — malware analysis report

Static analysis result for SHA-256 9b5cbab0daa10d4b…

MALICIOUS

PDF

114.2 KB Created: 2021-03-19 19:50:22 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-24
MD5: 8d8712795dbad5929ff0a67070d0a6b6 SHA-1: 577acc98502a10578a26830d9e3f4e04c78c7971 SHA-256: 9b5cbab0daa10d4b69ffa74168f943157cb84ba1af588b30f9b0e83f53c0a905
186 Risk Score

Malware Insights

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

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9958

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://resalured.ru/wix?keyword=game+theory+for+applied+economists+solution+manual+pdf PDF link annotation
    • https://cdn-cms.f-static.net/uploads/4422909/normal_6052a73782a3c.pdfIn PDF document text
    • http://wusokamojifel.scienceontheweb.net/90449814824.pdfIn PDF document text
    • https://cdn.sqhk.co/lusajiki/ckFTjak/brickyard_plantation_disc_golf.pdfIn PDF document text
    • http://nugowimabu.mywebcommunity.org/zuripoxupilitalitusol.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4375361/normal_6008cd5e9be53.pdfIn PDF document text
    • https://cdn.sqhk.co/buzaxelubot/PhatOHk/sulitojodoxilobapukot.pdfIn PDF document text
    • https://cdn.sqhk.co/morureju/jggf7ji/sad_status_video_song_tamil_download.pdfIn PDF document text
    • https://cdn.sqhk.co/nupegefozub/gdjamp8/temple_run_2_game_download_karna_hai_pagalworld.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4366055/normal_6027461612836.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/getizar/green_screen_explosion_with_sound.pdfIn PDF document text
    • https://8909b315-4d59-4940-aabf-0fdaa532e0ad.filesusr.com/ugd/4542d9_6851c4f8ce7c4a808d4428f2185ebb99.pdf?index=trueIn PDF document text
    • https://9de673a2-3b8e-40eb-bbf5-c0ad8e71a3da.filesusr.com/ugd/bd5c68_322a6773d8f54b2bbf8a5dad94d121a6.pdf?index=trueIn PDF document text
    • https://696f1bd8-06c3-47a7-a8f7-e83e17ec8d18.filesusr.com/ugd/5ad03d_68456dcb1cf94b078bc1fa3cca701c4e.pdf?index=trueIn PDF document text
    • https://874c0fd6-92eb-497b-905f-dc7ca4d2e287.filesusr.com/ugd/5ca7d4_7aec650908a34cc39db9c0157aa77d4e.pdf?index=trueIn PDF document text
    • https://5145f1b1-3202-4090-a8a2-79a8bebad775.filesusr.com/ugd/89b1bc_ba809261b00d42b1ae889cf807fc9ef2.pdf?index=trueIn PDF document text
    • http://pelebirepopo.onlinewebshop.net/86162205779.pdfIn PDF document text
    • https://e432c3f7-acc0-403b-bc7f-1b8c16782643.filesusr.com/ugd/6a4899_dd6adbcaa76349ff81fcbf8b862e280c.pdf?index=trueIn PDF document text
    • https://dc273c12-e125-4738-b2e6-b96bc4bd5eb7.filesusr.com/ugd/c8df25_a4c4a6512231419da4e30b4fec3f570b.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/buganabowumujef/yesterday_beatles_guitar_sheet_music.pdfIn PDF document text
    • https://s3.amazonaws.com/vezumobigodub/ato_weekly_tax_tables_2018.pdfIn PDF document text
    • https://ad843f61-c544-48d7-8cfb-3c048b9edb46.filesusr.com/ugd/0dd9ed_7a03973790a54da9ac37ea78ca1b94eb.pdf?index=trueIn PDF document text
    • https://711920be-b761-4f0e-a604-762b26663b16.filesusr.com/ugd/ffcbea_623e92d12c3245e380d2f01f16dd1ae7.pdf?index=trueIn PDF document text
    • https://88749095-6fd7-453f-8e8a-15b48fe47dd1.filesusr.com/ugd/e4d7df_88d82b4b17a547feb8680f8dade3d9df.pdf?index=trueIn PDF document text
    • https://s3.amazonaws.com/lemefofutomapox/gokezawedizinapa.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
    • https://savannah.gnu.org/projects/freefont/In PDF document text
    • http://www.gnu.org/licenses/In PDF document text
    • http://www.gnu.org/copyleft/gpl.htmlIn PDF document text
    • http://scripts.sil.org/OFLIn PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 5

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off000146b2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x146B2 6444 bytes
SHA-256: 17317ff7199fe048045aef415e302091a0922ff2b0f7e3acabec941530825fb1
font_01_sfnt_off00015665.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15665 3492 bytes
SHA-256: 25449e3ab635cb1340089cca950084ab8dd02e699c7b524f79bc532a3ea91a87
font_02_sfnt_off000162fc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x162FC 5528 bytes
SHA-256: caf554cc429894ea0c75072ab794a65cfd92b645e912a08cc90880cac85e1b49
font_03_sfnt_off000175ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x175AE 13500 bytes
SHA-256: d15a99a1bda49462df55adbea7f0c82771188e11c88505678ad55b64156c4b96
font_04_sfnt_off0001a35e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1A35E 16284 bytes
SHA-256: 4c8c8dd98b301f9dafbad92a53377c903c823d2bd33d1c9b96ae22ccb36a2e5a