Malicious PDF — malware analysis report

Static analysis result for SHA-256 e4c7c81f6dc437d0…

MALICIOUS

PDF

81.0 KB Created: 2021-09-19 11:26:22 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 75f3f6b9af38cb5c77c4b878553554f5 SHA-1: 6c0a39fe8159c97df634a847803b8d228018dd3c SHA-256: e4c7c81f6dc437d096fc494e3145f1b080ee19035256e14248cd0e87c2775c05
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by multiple heuristics, including a critical ClamAV detection and a high ML classifier score. The presence of embedded JavaScript (PDF_JS) indicates an attempt to execute malicious code, likely to download and execute a second-stage payload from one of the numerous external URLs. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further suggests a phishing or spamming operation leveraging many disposable domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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 https://inwebjor.ru/uplcv?utm_term=live+news+kairali+tv PDF link annotation
    • http://www.mattig-accounting.bg/fisiere/file/97598890685.pdfIn PDF document text
    • http://dallard.fr/ressource/site-image/files/valilibenapisokeke.pdfIn PDF document text
    • https://parisautotravel.com/wp-content/plugins/super-forms/uploads/php/files/nq08rp2ur8lbp6644bvfn2j1s6/75800635318.pdfIn PDF document text
    • https://buzascsaba.hu/userFiles/file/20342492402.pdfIn PDF document text
    • http://xhiehchin.com/Xhieh_News/_file/87901194111.pdfIn PDF document text
    • http://wxmx.cn/upload/ckimg/files/202109140630512982.pdfIn PDF document text
    • https://dialogueinpraxis.net/files/docs/bofagodutosijonavutakov.pdfIn PDF document text
    • http://test-immo.com/file/88906903807.pdfIn PDF document text
    • http://drukarnia-warszawa.pl/pliki/file/netamewe.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/vowibawopuxakuz.pdfIn PDF document text
    • http://allier.proximeo.com/ckfinder/userfiles/files/8122717597.pdfIn PDF document text
    • https://yuvasarkar.org/userfiles/file/vuvikenadesug.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109182329399489.pdfIn PDF document text
    • https://senfina.top/uploads/files/dutuzo.pdfIn PDF document text
    • http://agedwedfjtj.pretty-match.com/upload/files/bubofano.pdfIn PDF document text
    • http://www.radioemka.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613aa21b5ea79---fokixowebuj.pdfIn PDF document text
    • http://dataprint.ie/uploads/file/19635536263.pdfIn PDF document text
    • http://www.injamal.es/nueva/ckfinder/userfiles/files/pekegofikeg.pdfIn PDF document text
    • http://sevenseahotel.com/uploads/images/files/wupovunikazutijo.pdfIn PDF document text
    • https://gianlucabruno.it/dati/upload/file/21215217256.pdfIn PDF document text
    • http://wangyiphk.com/userfiles/koxebuluw.pdfIn PDF document text
    • http://xn--2-140-swe8h.xn--p1ai/files/kawudelikewotazaposoto.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/67898461045.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_off0000d93d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD93D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f14f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF14F 17760 bytes
SHA-256: bbf8f2501e9dbd1fdc60858d93344d24f9c7c596ae4f977421e05b04a330a491
font_02_sfnt_off00011f54.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11F54 10184 bytes
SHA-256: 5d4058354392163e0b1f6ae667c8cab1ec5149b6400a3a5f3e9af41fe78400ab

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