Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb618841c8d5af86…

MALICIOUS

PDF

77.0 KB Created: 2021-03-16 20:39:02 +02:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-09-18
MD5: 46f5f59d1ff9012acab2b7457bfe3277 SHA-1: 905bdb1cfea6153ad4b70e73c6049d5ac226ad1b SHA-256: bb618841c8d5af86952ba6a964f00fd8f005ad38ba197eff72cde8abedaedcec
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 0.9990

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://xezojetit.ru/123?utm_term=brothers+in+arms+d+day+android PDF link annotation
    • https://cdn.sqhk.co/wanevakaxuma/pgi3N9z/pandemic_ebt_virginia.pdfIn PDF document text
    • http://termometr-medikal.site/mixaforoveworb3rw3.pdfIn PDF document text
    • https://cdn.sqhk.co/vidujubotaf/f2skh2N/pinout_usb_b_connector.pdfIn PDF document text
    • http://wegansit.space/how_long_will_lawn_mower_battery_lastnr1ut.pdfIn PDF document text
    • https://cdn.sqhk.co/muzexeragod/iicOfhj/gurizubi.pdfIn PDF document text
    • http://portkamesto.site/holy_quran_app_in_englishof50t.pdfIn PDF document text
    • https://cdn.sqhk.co/zetikitor/eTje1hd/18045705756.pdfIn PDF document text
    • https://cdn.sqhk.co/mevazasid/gemiea1/todo_cuenta_letra_y_acordes.pdfIn PDF document text
    • https://cdn.sqhk.co/fiwujumejuf/icwkYRK/32357930644.pdfIn PDF document text
    • https://cdn.sqhk.co/dodazija/iaghfje/58367613535.pdfIn PDF document text
    • https://cdn.sqhk.co/vigefifobot/gjegdVd/zinolobave.pdfIn PDF document text
    • https://cdn.sqhk.co/seseniluvus/jqR7ggK/crunchyroll_premium_not_working_2020.pdfIn PDF document text
    • http://ketotreno.buzz/77679596843qp40.pdfIn PDF document text
    • https://cdn.sqhk.co/kuzezajolu/ge6jbVG/rummikub_game_amazon_uk.pdfIn PDF document text
    • https://cdn.sqhk.co/raserijene/dohajdE/21265333615.pdfIn PDF document text
    • https://cdn.sqhk.co/mogidamiko/iiheRif/ragupunimodixonorove.pdfIn PDF document text
    • http://lifeshop.pro/29835977912fmxda.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • https://45b0b119-5f8c-43e7-b437-4e12d17c1c81.filesusr.com/ugd/3826db_389349cc230e4664ac76ffd1db1dfdf7.pdf?index=trueIn PDF document text
    • https://f8b2de7a-6012-4721-b8f1-df5267d6bb95.filesusr.com/ugd/8ebb60_a2229ecfe72a4a4583dd622b3be4f00d.pdf?index=trueIn PDF document text
    • https://3568ea06-17fa-4787-91ae-86b9aa918cbd.filesusr.com/ugd/8ade13_01edcc27189d431c99a71347566edeeb.pdf?index=trueIn PDF document text
    • https://6376acfe-5884-4251-b3d5-19a03c044549.filesusr.com/ugd/de3d83_b57d2dc02a1147ceb8fe1cf70eabab5e.pdf?index=trueIn PDF document text
    • https://42e65457-ec34-4553-8979-78b6e302f774.filesusr.com/ugd/f1976d_268f032b58534bd6b23efd3c73c9b1d0.pdf?index=trueIn PDF document text
    • https://9b704b87-3668-414c-a24e-b30400fe0e33.filesusr.com/ugd/51c472_81c81b36bacd4918895d6ce592b5b356.pdf?index=trueIn PDF document text
    • https://c6f55193-7475-4343-97dd-33cb3b141b6a.filesusr.com/ugd/808d8c_53b3d9adfd384c889909601fb16a2259.pdf?index=trueIn PDF document text
    • https://247e77cc-5367-4382-8586-7c5891409f42.filesusr.com/ugd/2dbf5a_22520a65c98d452886f2e2d5d398255e.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 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000effb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFFB 5184 bytes
SHA-256: 1fd82bd968b0d09b327b7366cee7c532106460891d760a490b114beef205f445
font_01_sfnt_off00010174.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10174 10640 bytes
SHA-256: 38ccf0b1030d1dd75a282459f57a5809e48e344523086cd4e5172c9e384ee910