Malicious PDF — malware analysis report

Static analysis result for SHA-256 f21fe80f56f54ca7…

MALICIOUS

PDF

75.7 KB Created: 2021-10-13 12:16:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 80a49d0a06c8b9dc77ba48773e5393b4 SHA-1: 4d266dbe59a94988dab4d238ac5e83eba553f0db SHA-256: f21fe80f56f54ca72b9f6c8ed1a96d6ca339abb1c36f291a202afd76b3203b49
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 hosting and exhibiting link farm characteristics, suggests an attempt to obscure the ultimate destination or to distribute malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely involving phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9908

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://women-for-marriage.com/ckfinder/userfiles/files/jisatupudidekobaju.pdf In PDF document text
    • https://alev.az/userfiles/file/sodafupagewapafumikewim.pdfIn PDF document text
    • http://megalabsrl.it/userfiles/files/9520024579.pdfIn PDF document text
    • http://sbsinternationalschool.org/userfiles/file/47163049767.pdfIn PDF document text
    • https://suacuacuontoanphat.com/upload/files/jaxukemexuwawivipebaxe.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/xujowof.pdfIn PDF document text
    • http://baldonimarcostudio.eu/userfiles/files/jamufawapikusek.pdfIn PDF document text
    • http://mitcostruttori.it/userfiles/files/tusasubisivefenevaj.pdfIn PDF document text
    • https://atlas-consulting.ro/fckeditor/fisiere/file/70188754827.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/dekegasujotuw.pdfIn PDF document text
    • http://xindeshiye.com/uploadfile/file///2021101301093239.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/54876870495.pdfIn PDF document text
    • http://openkomm.yussfone-crm.com/userfiles/file/binivipuxar.pdfIn PDF document text
    • https://iieng.org/editor/ckfinder/userfiles/files/vetajawiwasedosat.pdfIn PDF document text
    • https://sskundal.com/userfiles/file/12017546726.pdfIn PDF document text
    • http://nhasachthunam.com/upload/files/poribatuferezefufuwoli.pdfIn PDF document text
    • https://footballsod.com/images/ck-uploads/files/basaduwefeteg.pdfIn PDF document text
    • http://cokhilegia.com/upload/files/16931169886.pdfIn PDF document text
    • https://tch.lu/files/files/tasagowadoxuvotiwejemoli.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/16160f758976e6---gubikareseve.pdfIn PDF document text
    • http://xn--xhq021fvrwdth.com/d/files/rorilixufodobifumafufu.pdfIn PDF document text
    • http://mpti.ru/userfiles/file/mopowude.pdfIn PDF document text
    • https://electroagro.es/pub/files/61005863133.pdfIn PDF document text
    • http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/16159c7af51eb1---gujiserazivuw.pdfIn PDF document text
    • https://www.hungryalex.com/wp-content/plugins/super-forms/uploads/php/files/f7c18a5151ef0288960f3cae42450855/vofuwavaxonu.pdfIn PDF document text
    • http://wgadget.com/file_media/file_image/file/tapegisuxelugimorozivunev.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Gsjc/~3/EqozwcbAC44/uplcv?utm_term=small+moral+stories+in+teluguPDF 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_off0000bd7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBD7A 10624 bytes
SHA-256: 4713e4f3b69c01344f0c8c8c58073eabe21695602acafaae25c79fde53dee4cc
font_01_sfnt_off0000d5c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5C0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000edd2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDD2 19580 bytes
SHA-256: d96f1ebf502cd61107169b0b66d2a0999103decae37dac83cce32559507e7eab