Malicious PDF — malware analysis report

Static analysis result for SHA-256 fcdfa2bfe8f4c503…

MALICIOUS

PDF

68.9 KB Created: 2021-09-25 19:12:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 30adc0015db442202fcab2516c7c09c5 SHA-1: b46b89c34ce9366822972a8ac2da0fae77d67de7 SHA-256: fcdfa2bfe8f4c5038ed6184b7b8711fee87e6ec859411e132dddc471ce2cb54d
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 part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and URL patterns suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://am-system.eu/ckfinder/userfiles/files/femofosipijo.pdf In PDF document text
    • http://hometextiles-consultant.com/ckfinder/userfiles/files/30348386336.pdfIn PDF document text
    • http://bosch-elektronarzedzia.pl/catalog/file/monimozejuxejedopojurek.pdfIn PDF document text
    • https://1am130r6h1n1-k11a7.com/contents/files/xodukenomisopemeladu.pdfIn PDF document text
    • https://gadesign52.com/uploads/files/202109012348025599.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021090705361121.pdfIn PDF document text
    • http://storemisr.com/uploads/files/tugiramuvikufogisefakikuz.pdfIn PDF document text
    • https://didaktika.drmix.cz/uploads/files/nekovutinexuxi.pdfIn PDF document text
    • https://www.aifimm.it/admin/inc/ckfinder/userfiles/files/fubesifugirifalulekogura.pdfIn PDF document text
    • http://gojjang.com/uploads/files/jexaziwunafapeso.pdfIn PDF document text
    • https://thehideawayresortpattaya.com/userfiles/files/sovisabosigop.pdfIn PDF document text
    • http://sonhanint.com/uploadpic/sun/files/202109220219134203.pdfIn PDF document text
    • http://nissanotogovap.vn/uploads/images/files/zavatawopulugagajoteloz.pdfIn PDF document text
    • http://mmsmarin.com/imgimage/file/xibanigogukudubawakepav.pdfIn PDF document text
    • http://advocaatindex.nl/images/uploads/jixolulopaviselape.pdfIn PDF document text
    • http://geombiagioschettino.eu/userfiles/files/29081891177.pdfIn PDF document text
    • https://onecre.com/images/content/files/wabuzodekolowofarod.pdfIn PDF document text
    • http://afghansolar.com/userfiles/file/gubabirilarawokakeja.pdfIn PDF document text
    • http://gloteckr.com/upload/editor/file/gufuno.pdfIn PDF document text
    • http://energo-market.ru/sadm_files/49646778910.pdfIn PDF document text
    • http://xn--80aiddhbkcq5bcaz.xn--p1ai/upload/files/fepolenifosusig.pdfIn PDF document text
    • https://www.davidcosz.de/wp-content/plugins/super-forms/uploads/php/files/2dr6dadq7jagagtf8otscsb1ro/dafowobofusatux.pdfIn PDF document text
    • http://huefpdf.org/upload/file/55673803470.pdfIn PDF document text
    • http://www.psychophonie-tarbes.com/ckfinder/userfiles/files/15388067488.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=magic+item+compendium+3.5+pdfPDF 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_off0000af5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF5C 11112 bytes
SHA-256: c8850c9bd16e8cc328f59b138aa5da04c90029f684b698b9c89bd9094af42232
font_01_sfnt_off0000c926.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC926 14776 bytes
SHA-256: dd872518b15658e88895431f8a34939c6b5e01419608a1cde4fdf9cf0bea14a9
font_02_sfnt_off0000ede9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDE9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1