Malicious PDF — malware analysis report

Static analysis result for SHA-256 ecde0ca89aab9029…

MALICIOUS

PDF

79.8 KB Created: 2021-09-18 21:38:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 0123754ab360a83a249d5a465ca75e75 SHA-1: a1bd1683e549e6dfee340a2f3798e9294c2ce330 SHA-256: ecde0ca89aab90293e733703332a005b870362c87c56e4736de3682505244bca
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URIs and is flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The presence of multiple links, including one with a 'utm_term' parameter suggesting a tracking or lure mechanism, indicates an attempt to redirect users to potentially harmful sites. Although no scripts were explicitly extracted, the PDF structure and heuristic firings strongly suggest it's designed to facilitate malicious redirects.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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://archism.ru/uplcv?utm_term=mp4+to+mp3+converter+app+for+pc PDF link annotation
    • http://standdominica.org/files/files/tesofobize.pdfIn PDF document text
    • https://silky.ae/images/bulk_images/files/51052265499.pdfIn PDF document text
    • http://sro52.ru/uploads/files/58513829922.pdfIn PDF document text
    • https://cytokin.ca/upload/editor/file/99339396388.pdfIn PDF document text
    • http://sage-chem.com/image/files/20210902_055219.pdfIn PDF document text
    • http://cheapneasytrafficschool.com/CheapNEasyTrafficSchool/pa/trainstation/uploads/image/file/54651970822.pdfIn PDF document text
    • http://baschin-heizung.com/meineBilderAlbertGrundschule/file/jusenekoropixef.pdfIn PDF document text
    • http://ttworld.hu/uploads/content_files/files/vexedunuzasesoxopafimu.pdfIn PDF document text
    • http://macabrey-luthier.fr/data/Files/gegudizebupidisu.pdfIn PDF document text
    • http://atenngo.com/admin/sites/site/documents/libiled.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/mugupudibiviva.pdfIn PDF document text
    • https://rocksoliddesigns.biz/userfiles/file/doripujuzogebox.pdfIn PDF document text
    • http://www.julietlandau.com/fckeditor/userfiles/file/rokimabegi.pdfIn PDF document text
    • http://abapaposentados.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1614476889f8ae---25920392419.pdfIn PDF document text
    • http://wwm-quanta.com/upload/files/niputoronazo.pdfIn PDF document text
    • http://ksklinika.ru/ckfinder/userfiles/files/2810288873.pdfIn PDF document text
    • http://flyingkirin.com/uploadfiles/file/08192257528.pdfIn PDF document text
    • http://electric-kernbichler.at/49440893801.pdfIn PDF document text
    • http://vanillasky-ch.com/images/files/xemesemenivor.pdfIn PDF document text
    • http://balbu.eu/uploads/news/file/jafepumexosedazojusej.pdfIn PDF document text
    • http://dostrojar.sk/UserFiles/file/91155965672.pdfIn PDF document text
    • https://tktravelkorea.com/FileData/ckfinder/files/20210918_D063267C590A88ED.pdfIn PDF document text
    • http://sosnovgeo.ru/userfiles/file/jawifefukitiraw.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_off0000d0d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD0D0 18656 bytes
SHA-256: c26fa32a72ea36787302fe7471b73f5bf5ccce130ff491d399dfabc8796f32fd
font_01_sfnt_off000100cc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x100CC 10644 bytes
SHA-256: 6ad96e85971d477daac50119c93f7d60a2e89d451536799c1b52fd79e0b26c07
font_02_sfnt_off00011948.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11948 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1