Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f1e0e8cbcae352f…

MALICIOUS

PDF

79.0 KB Created: 2021-09-24 00:41:47 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: b5ab6cbd33d1229820b2fb8df5fff895 SHA-1: 02b6d8fba27e1c491ad7f81949a6d9de548be4d9 SHA-256: 7f1e0e8cbcae352f31d77fb67cbb3ef21a15526f14b82022777d9fe293f053d3
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which are hosted on disposable domains, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to redirect users to malicious sites for further exploitation or credential harvesting. The presence of embedded JavaScript (T1059.007) further supports its role as a delivery mechanism, potentially for a second-stage payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://centralgiving.com/media/userfiles/file/zajurekovup.pdf In PDF document text
    • http://berbun.com/user_img/file/xilenixenurulonu.pdfIn PDF document text
    • https://giritrademark.com/content_files/files/94851449380.pdfIn PDF document text
    • http://dalhousieretreat.com/cote_dor_import/admin/ckfinder/userfiles/files/bupaxipomidakobajun.pdfIn PDF document text
    • https://backcountryplayground.com/wp-content/plugins/super-forms/uploads/php/files/c3e53bffd7f7d8a84f23b27c48beba62/8294548509.pdfIn PDF document text
    • https://coverline.ro/userfiles/file/55106858453.pdfIn PDF document text
    • http://elturo.ru/img/upload/files/tumenojidurutazim.pdfIn PDF document text
    • http://www.carolglassman.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614717770034b---83834993260.pdfIn PDF document text
    • http://revistaspontan.ro/assets/ckfinder/core/connector/php/uploads/files/66486041187.pdfIn PDF document text
    • http://doudou.tw/userfiles/files/dabeda.pdfIn PDF document text
    • https://olivier-daulte.com/ckfinder/userfiles/files/56737109412.pdfIn PDF document text
    • http://kapsalonvogue.nl/files/file/lodoxaziso.pdfIn PDF document text
    • http://cannamelis.com/userfiles/file/18692221708.pdfIn PDF document text
    • http://daisin1977.com/js/upload/files/mobima.pdfIn PDF document text
    • http://koala-al.com/d/files/putusajulitudorefuki.pdfIn PDF document text
    • https://ozsersogutma.com/upload/files/1148563428.pdfIn PDF document text
    • http://studiotravenzolo.it/userfiles/files/23386303286.pdfIn PDF document text
    • http://wwsm-hk.com/files/file/satixadukepinanija.pdfIn PDF document text
    • http://neapol-m.ru/usr/file/xakexipes.pdfIn PDF document text
    • http://michael-dhom.com/webseiten/file/vewidijov.pdfIn PDF document text
    • http://aktifimmo.lu/userfiles/files/pegetepefewazimesesaz.pdfIn PDF document text
    • http://hublihorse.com/uploads/userfiles/files/firodowesilu.pdfIn PDF document text
    • http://sh-ruiyangcpa.com/userfiles/file/2021-9///202199330565612.pdfIn PDF document text
    • http://hoshitorionline.com/uploads/files/65329206663.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=far+cry+3+androidPDF 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_off0000cd63.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCD63 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000e575.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE575 19396 bytes
SHA-256: 745610f8d0d496f9ab76c177cfa1b4f106c9159cd9a291a6052287604a7536b6
font_02_sfnt_off0001182b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1182B 10184 bytes
SHA-256: ec766586c9911b4ef44fe09a7648db17df4eafb84b8571aac2f263b71e6278c3