Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1be5783a30f178c…

MALICIOUS

PDF

72.4 KB Created: 2021-09-11 04:12:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: af843935549816c0a0ae1e2cf108b883 SHA-1: 5de91123dc927107404955b52c0077c337acdadc SHA-256: f1be5783a30f178ce2d7b3a8d10877aab53f180e4f913f8ada23a8853ab48b98
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to host malicious files. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or download process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://wwsm-us.com/files/file/59087754718.pdf In PDF document text
    • https://keepingscore.org/userfiles/file/parawukojamofatoxefe.pdfIn PDF document text
    • http://att-na.com/upload/mazido.pdfIn PDF document text
    • http://megamento.com/_UploadFile/Images/file/rarukilumajogolonen.pdfIn PDF document text
    • https://pataniforum.com/admin/jquery/ckfinder/userfiles/files/30665514761.pdfIn PDF document text
    • http://studiozammuner.eu/userfiles/files/sulogusowaginep.pdfIn PDF document text
    • http://www.martiusstaden.org.br/js/ckfinder/userfiles/files/vurepukudirijokesa.pdfIn PDF document text
    • https://www.gpaci.org.br/cms/ckfinder/userfiles/files/mobekebabepiz.pdfIn PDF document text
    • https://www.grandeprairie.org/wp-content/plugins/formcraft/file-upload/server/content/files/16134eb4b2778a---seroguvadeseribimo.pdfIn PDF document text
    • http://hutbephottaihaiphong24h.com/upload/files/39239622669.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/79260823858.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/52787902801.pdfIn PDF document text
    • https://melz-feu.ru/upload/figopanejibes.pdfIn PDF document text
    • http://goteneplast.se/files/images/file/89703759749.pdfIn PDF document text
    • https://www.hasmow.com.au/application/third_party/ckfinder/userfiles/files/lawepusejoxemoserugokedi.pdfIn PDF document text
    • http://modero.vn/upload/files/dagizatisawonekafebudu.pdfIn PDF document text
    • http://directopinion.biz/uploads/FCK_files/file/matebopavisebogepowesujib.pdfIn PDF document text
    • http://wpchkg.com/upload/image/file/32355611324.pdfIn PDF document text
    • http://gandolfiarchitetti.com/userfiles/files/22771980628.pdfIn PDF document text
    • http://a-range.ru/wp-content/plugins/formcraft/file-upload/server/content/files/1613af90084bbf---sanopevef.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/21945310694.pdfIn PDF document text
    • https://artasedanasingaraja.com/uploadfck/file/kikuk.pdfIn PDF document text
    • http://creptiles.dk/userfiles/file/navatatupijanap.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=free+download+web+browser+for+androidPDF link annotation
    • http://zs.tom.ru/jsplugins/ckfinder/userfiles/files/pixesomovemudikupis.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_off0000bc22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBC22 15540 bytes
SHA-256: b973dc470cd8d390dae9e76a078b2e94aca1540075686e54195bf21df4727576
font_01_sfnt_off0000e3bc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3BC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fbd3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFBD3 10452 bytes
SHA-256: 4268bdb72c937751353c715c85874db09d28771e3b7662d241e245f32b4de563