Malicious PDF — malware analysis report

Static analysis result for SHA-256 e03b87bea2de13a7…

MALICIOUS

PDF

79.3 KB Created: 2021-09-30 10:30:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-03
MD5: cbaf219a50800e1ec71e07b900bf044f SHA-1: fb55d9c5dd0918422ff7ca1bd49c216667b7edc0 SHA-256: e03b87bea2de13a76584a3d436312e7e8f251724fef633d1c29af2ba523c9458
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The presence of numerous external URIs, many pointing to disposable domains and forming a link farm, suggests a redirection mechanism likely used for phishing or to download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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://wmsone.com/eimages/file/zafix.pdf In PDF document text
    • http://win-sonic.com/ck_imgs/files/sowoziliji.pdfIn PDF document text
    • https://loyallcanada.net/editor_files/file/nubewapefoxafasoxakeguzu.pdfIn PDF document text
    • https://bem-sa.com/img/file/zukijuweniso.pdfIn PDF document text
    • http://lecostationery.com/files/file/jovusagugibofubebaxeki.pdfIn PDF document text
    • http://rosritual.su/app/webroot/js/ckfinder/userfiles/files/45892796222.pdfIn PDF document text
    • http://kibunajcc.com/ckfinder/userfiles/files/tonuxesuvifudadobo.pdfIn PDF document text
    • https://hyosungulf.com/uploads/file/waluxidukofeg.pdfIn PDF document text
    • http://ooexperience.be/assets/Image/files/41751024613.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/bixiri.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/33252984173.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/6938182798.pdfIn PDF document text
    • https://acatay.daynexdemo.tk/upload/ckfinder/files/zikewuseveje.pdfIn PDF document text
    • https://itandem.net/ckfinder/userfiles/files/fedewekozanametuwageba.pdfIn PDF document text
    • http://winhazel.com/indigo/ckfinder/userfiles/files/josib.pdfIn PDF document text
    • https://lolakarimova.uz/ckfinder/userfiles/files/56301013593.pdfIn PDF document text
    • http://cz-synergy.cz/data/file/52780069154.pdfIn PDF document text
    • http://contelex.it/userfiles/files/18483983433.pdfIn PDF document text
    • https://oancora.com/ckfinder/files/paxit.pdfIn PDF document text
    • http://hoanggiaphatland.com/uploads/image/files/55319037552.pdfIn PDF document text
    • https://kampusogrenciyurdu.com/file/16722502948.pdfIn PDF document text
    • https://bandai-k.com/userfiles/file/21293394574.pdfIn PDF document text
    • http://business-plan-capalpha.eu/mbp/upload/images/images/upload/ckfinder/66911787851.pdfIn PDF document text
    • http://ediljolli.com/userfiles/files/banutelagepona.pdfIn PDF document text
    • http://tpokebar.com/uploads/files/87801396966.pdfIn PDF document text
    • https://harpethvalleyhealth.com/wp-content/plugins/super-forms/uploads/php/files/825e30123cf61ff00485f896836c40a2/bepemegiluwokelejafej.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/GLLx1DTH0VQ/uplcv?utm_term=what+happens+when+i+block+a+number+on+androidPDF 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_off0000c8c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C3 20312 bytes
SHA-256: 07f1faf392113fa5e7fad02ebfc81c8b28c3cdbfd96484c2c8e963d5e627b4e4
font_01_sfnt_off0000fcc3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCC3 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114da.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114DA 11188 bytes
SHA-256: 4aa393c09dc6c7027e000d7403babd511814ee50f6a77918ae7be55a7c77716b