Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae921fbe34fc98ff…

MALICIOUS

PDF

72.9 KB Created: 2021-09-09 03:20:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: a7e95e9f7947dbc6e79a8c2e2279765d SHA-1: be0b3d15331dbfb32013392dbe691edc5696438f SHA-256: ae921fbe34fc98ff03aa2672064ed603192e10fa34997f8b0d620146adcf8fec
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to potentially malicious domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a phishing or malware distribution attempt. The ML classifier and ClamAV detection further support the malicious nature of this file.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9956

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://inphilong.com/upload/files/gojizuditid.pdf In PDF document text
    • http://goldenmallbiotech.com/upload/files/fivodixofo.pdfIn PDF document text
    • http://twtqedu.com/userData/ebizro_board/file/gasibubenidivebi.pdfIn PDF document text
    • http://xn----7sbabaajmdfbk3ddf3azka3b6a2r.xn--p1ai/ckfinder/userfiles/files/nusim.pdfIn PDF document text
    • http://safiorida.dk/operatori/userfiles/file/subatuluxe.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/kazalazimanekexudu.pdfIn PDF document text
    • https://almavilag.hu/files/files/rufufezazu.pdfIn PDF document text
    • http://cioccolatogallucci.it/userfiles/file/92330366705.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090122245572814.pdfIn PDF document text
    • http://ajtoablakcentrum.com/_user/file/zigezudoz.pdfIn PDF document text
    • https://luxesystem.site/js/ckfinder/userfiles/files/17754771667.pdfIn PDF document text
    • https://fo-prefectures.com/pages/files/boduxabipetikagodateje.pdfIn PDF document text
    • http://asckhn.com/acskhn/userfiles/file/41779975642.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202199743374754.pdfIn PDF document text
    • http://www.colegiometa.net/home/wp-content/plugins/formcraft/file-upload/server/content/files/1613485f0826a6---98999706420.pdfIn PDF document text
    • https://noddy.nu/images/file/sowojolidanuvewedewomoluz.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/dosaxojokej.pdfIn PDF document text
    • https://dla-pracownika.pl/pliki_user/File/30685690730.pdfIn PDF document text
    • http://roleco.pl/data/aktualnosci_imgs/file/ronadujibi.pdfIn PDF document text
    • http://www.thediethub.in/wp-content/plugins/formcraft/file-upload/server/content/files/16132f39bf31c8---tukamelakogovesepawejum.pdfIn PDF document text
    • http://zzfcw.com/file/fkimg/file/teguluwo.pdfIn PDF document text
    • http://aostavet.it/userfiles/files/mijipeduluxokosuxapijexoz.pdfIn PDF document text
    • http://burmeseburmilla-allevamento.com/userfiles/files/xuxasuxosu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=seven+letter+word+starting+with+gPDF 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_off0000b813.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB813 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d025.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD025 17452 bytes
SHA-256: e37925640f27961825a517c1ef573db44a793286c489479432c2f225188e5d2e
font_02_sfnt_off0000fdc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDC6 10752 bytes
SHA-256: 2e68103c491705f5c1f1cd63bd8340a29c2ded562c0ca2371863b884ec2c77ac

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