Malicious PDF — malware analysis report

Static analysis result for SHA-256 a8abb3c46e249376…

MALICIOUS

PDF

83.2 KB Created: 2021-09-10 01:54:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 882900cb7e507637162958e333b42021 SHA-1: 1d8ed7f5777047c16c938a106d51b7f75e64f5d4 SHA-256: a8abb3c46e249376155b1ea3dccd5ce322a04d4d8effeefd0ace3c8fd0bc9575
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is often used to obfuscate malicious actions or redirect users. The presence of a link farm with numerous disposable URLs, many pointing to PDF files, suggests an attempt to host malicious content or phishing pages. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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 http://schokofontaenen.de/idata/96084918947.pdf In PDF document text
    • https://ladychief.com/wp-content/plugins/super-forms/uploads/php/files/b61b76610f572728ac35a5544b536c5a/gebederitobe.pdfIn PDF document text
    • http://55pluscommunityspecialist.com/userfiles/files/suduxub.pdfIn PDF document text
    • http://igabana.com/upfolder/e/files/20210906145159.pdfIn PDF document text
    • http://ubest.ru/images/file/18867387634.pdfIn PDF document text
    • http://biancoacolori.it/userfiles/files/fufumefavopabiginuwuro.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161350288bb879---mewaneduwekaruxere.pdfIn PDF document text
    • https://graveyards-fuj.ae/userfiles/files/kozudidubuzikamegowibub.pdfIn PDF document text
    • http://sgrdinstitutionspandher.org/sgrd/userfiles/file/nonanurafabekivarapit.pdfIn PDF document text
    • http://5lovestartw.com/CKEdit/upload/files/pasonumatefixotuveb.pdfIn PDF document text
    • http://engcaphone.com/_UploadFile/Images/file/59412802540.pdfIn PDF document text
    • https://srmhomes.com/images/bulk_images/files/49007110579.pdfIn PDF document text
    • https://alcoolassistance-creuse.net/www/site/js/ckfinder/userfiles/files/92757943003.pdfIn PDF document text
    • http://autoachtercamper.nl/userfiles/file/36687128002.pdfIn PDF document text
    • https://fullprotec.com/ckfinder/userfiles/files/11704998263.pdfIn PDF document text
    • http://metabolizmusonline.hu/images/upload/file/60856034447.pdfIn PDF document text
    • https://taybaite.com/userfiles/file/45069493744.pdfIn PDF document text
    • http://thanhnhomdinhhinh.net/uploads/files/52267154324.pdfIn PDF document text
    • http://fmmvn.net/userfiles/files/rigimowim.pdfIn PDF document text
    • http://www.rpv-drachten.nl/files/file/zuwivazusimufi.pdfIn PDF document text
    • http://zelene-centrum.cz/webpagebuilder/ckfinder/userfiles/files/nunorir.pdfIn PDF document text
    • http://lrm.mcdonalds.ua/ckfinder/userfiles/files/gekorefadudomuxufajituj.pdfIn PDF document text
    • http://benetalent.com/upload/files/fabeziroxijibuvew.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/3vuEKuznOb8/uplcv?utm_term=onenote+2020+free+downloadPDF link annotation
    • 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_off0000e100.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE100 17836 bytes
SHA-256: 186dd1c072e94c096308ac541601bb8cef056679d0240146ae974fde34aac204
font_01_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 10440 bytes
SHA-256: 77bc5b69f192a3e65faa641f5ca12eefb18e7926621069bdbba9e4336a5c40a9
font_02_sfnt_off00012784.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12784 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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