Malicious PDF — malware analysis report

Static analysis result for SHA-256 c75e3d659f219356…

MALICIOUS

PDF

89.0 KB Created: 2021-09-09 01:16:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 53f1d866b69ec474d651814767fc9294 SHA-1: 9782dcf1bca3a8ad2ff800c4abf6e0f1ac94ff35 SHA-256: c75e3d659f21935683b6fb276de9085ba78ed20dc1078a084ddc12a887b9d0f6
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by 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 0.9835

Heuristics 4

  • 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://infrive.ru/uplcv?utm_term=aplikasi+pembuat+musik+android+gratis PDF link annotation
    • http://littlepearlbooks.in/data/eimages/file/jojogepudoxoravoge.pdfIn PDF document text
    • https://onlinendttraining.net/files/33780628593.pdfIn PDF document text
    • http://magiepourenfants.com/images/mediamanager/file/65194654238.pdfIn PDF document text
    • http://vnos.vn/app/webroot/uploads/files/99250133179.pdfIn PDF document text
    • https://www.piramideidiomas.com/ckfinder/userfiles/files/vulebefapasedufositadatos.pdfIn PDF document text
    • http://mynotary.ca/sites/all/sites/mynotary.ca/files/vajepikukekoluzokowaz.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/kasufegirowaxe.pdfIn PDF document text
    • http://onishi-kyosendo.jp/archive/vofewidal.pdfIn PDF document text
    • http://zoltysnieg.pl/pliki_wyswig/files/75259551707.pdfIn PDF document text
    • https://contabil-fiscal.ro/mm/file/34181715256.pdfIn PDF document text
    • https://karaari.leaddeehub.com/userfiles/files/dizetezovosofujodiki.pdfIn PDF document text
    • http://falconartistmanagement.com/ckfinder/userfiles/files/pujebofotujijedozugebo.pdfIn PDF document text
    • http://osc-pribor.ru/products_pictures/file/96732254486.pdfIn PDF document text
    • https://careersourceokaloosawalton.com/files/public/tajizuxonugugixetuvizi.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210903095521.pdfIn PDF document text
    • https://www.conkite.com/wp-content/plugins/super-forms/uploads/php/files/d2d1c3c9e36a98f69fc4c5c77c07c6d6/33465594218.pdfIn PDF document text
    • https://www.akilciilacdernegi.com/ckfinder/userfiles/files/najawoxomexo.pdfIn PDF document text
    • http://bisenzia.it/userfiles/files/9242557855.pdfIn PDF document text
    • http://malir-naterac.info/UserFiles/File/xadomulasemufubizakid.pdfIn PDF document text
    • http://nesthomes.in/userfiles/file/penegubaranamik.pdfIn PDF document text
    • https://www.highettmetal.com.au/application/third_party/ckfinder/userfiles/files/mepakerijejiwejub.pdfIn PDF document text
    • http://15449010.com/FileData/ckfinder/files/20210908_47CA29F8E596B344.pdfIn PDF document text
    • https://panificioilcavaliere.it/userfiles/files/58836112333.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-2/20210902105850936886.pdfIn PDF document text
    • https://jahanchart.ir/data/files/file/55989675509.pdfIn PDF document text
    • http://trainternational.in/wp-content/plugins/formcraft/file-upload/server/content/files/161305b70d505b---xuduwofiradasa.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://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000f975.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF975 11048 bytes
SHA-256: daf921be2b05d3e90004fac18c04e2243d2171428b046d1b905a69d8b6c86011
font_01_sfnt_off000112c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112C1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012ad3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AD3 16828 bytes
SHA-256: b41c69bbb10739e705afe93265ca9f720f4aaa86b002a05f9a517e849ec43b2d