Malicious PDF — malware analysis report

Static analysis result for SHA-256 fdd93662eceeb86f…

MALICIOUS

PDF

84.4 KB Created: 2021-09-20 07:57:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 81ba585b7bf28baf046061ad8c59f2ba SHA-1: c5e23fb6716bb887fe31dd3f726ce8c9337f3fbd SHA-256: fdd93662eceeb86f264a3385c2f020b4104de58b1404200e8922d99ae1ee9a5a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on suspicious domains and are flagged as part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution. Although no scripts were directly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://ljjxmining.com/uploadfile/file///2021090413153716.pdf In PDF document text
    • http://cyuanmei.com/userfiles/file/95126805328.pdfIn PDF document text
    • https://www.esicm-old.org/admin/lib/ckfinder/userfiles/files/jukusinesalefi.pdfIn PDF document text
    • http://timnhanhonline.vn/upload/files/kulatovilimamekuvote.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/14687321694.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/ruledixakatikuboxerofidu.pdfIn PDF document text
    • https://mcdelandes.ca/uploads/file/jaxatatejanejupata.pdfIn PDF document text
    • https://sicurezzaips.it/uploads/file/65599722427.pdfIn PDF document text
    • https://sipsib.ru/wp-content/plugins/super-forms/uploads/php/files/9079ba11122594beb5c648ecbde778d0/80153483405.pdfIn PDF document text
    • http://studiomanzetti.it/userfiles/files/jomepidedibofofejofiwom.pdfIn PDF document text
    • http://maybomnuocdanang.com/uploads/image/files/gidijanajob.pdfIn PDF document text
    • https://chocoinmobiliario.com/wp-content/plugins/super-forms/uploads/php/files/5b268035f198067b7a3e265b23813c3f/robadazugu.pdfIn PDF document text
    • http://zzzwchem.com/upload/files/37147455493.pdfIn PDF document text
    • https://www.disbel.es/ckfinder/userfiles/files/rozurexiziduxufumul.pdfIn PDF document text
    • https://srldirect.com/ckfinder/userfiles/files/limonira.pdfIn PDF document text
    • http://mega.kz/media/upload/files/3900667665.pdfIn PDF document text
    • https://ehlibeytalimleri.com/resimler/files/xevezof.pdfIn PDF document text
    • http://mg001.cn/upload_fck/file/2021-9-2/20210902112724722663.pdfIn PDF document text
    • http://arredamentoambienti.it/img/file/komagivodijagatuk.pdfIn PDF document text
    • http://bensonlandscape.com/editorData/file/wigemanarapeg.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jatarusojusifomaverite.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/95803992967.pdfIn PDF document text
    • http://phutungototuanphat.com/img-tvdl/files/zekefizegelovatakip.pdfIn PDF document text
    • https://jairdefreitas.com/ckfinder/userfiles/files/mivosoduzuwofovubapu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=free+papercraft+templates+pdf+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_off0000e3dd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3DD 10752 bytes
SHA-256: f084fe4566a8e32b2e9ed733de3223a9173e78481d072da843e3c5c9cf2894d7
font_01_sfnt_off0000fca7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFCA7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000114b9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114B9 18336 bytes
SHA-256: d9d143eb852590b54b75f76855c4c9053a06fe9cf7fd4f279d9401fcc63ab2ab