Malicious PDF — malware analysis report

Static analysis result for SHA-256 aefc7871a8954b0b…

MALICIOUS

PDF

68.4 KB Created: 2021-09-28 12:26:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 2f914eb0f7c294b349a77e3313e7f09b SHA-1: 62e6c84243dc5d80514b3262048b8980ed85de36 SHA-256: aefc7871a8954b0be2cf53dbdfa0d07f28c090f123fcb288f9a2715ef1571afb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing and malware distribution. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as Pdf.Phishing.Trojan. The ML classifier also flagged it with high confidence. While no scripts were explicitly extracted, the presence of external URIs and the overall structure suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://allytemp.ru/uplcv?utm_term=onlyfans+hack+file PDF link annotation
    • http://medianet2000.net/amm_prod/image_news_popup/file/49586153295.pdfIn PDF document text
    • http://brukbet.com/user_images/file/winodotu.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/pibusono.pdfIn PDF document text
    • http://lecieldesandes.fr/ckfinder/userfiles/files/ropuzevodazo.pdfIn PDF document text
    • https://fresh-cherries.com/ckfinder/userfiles/files/89382681746.pdfIn PDF document text
    • https://aspirecambodia-edu.org/userfiles/file/dujowadazuvu.pdfIn PDF document text
    • http://katour.ru/admin/ckfinder/userfiles/files/jatudikulob.pdfIn PDF document text
    • http://net-work.cz/data/file/vijadurizejuvugo.pdfIn PDF document text
    • https://www.gs-gleichmann.de/wp-content/plugins/formcraft/file-upload/server/content/files/161380e316cfd8---94159934663.pdfIn PDF document text
    • http://www.ssc-ras.ru/ckfinder/userfiles/files/jetibuxo.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1615289a7a2085---duwozox.pdfIn PDF document text
    • http://tnslib.tools/userfiles/files/29155624157.pdfIn PDF document text
    • http://abworder.com/uploads/files/givimegeg.pdfIn PDF document text
    • https://manpowernepal.net/ckfinder/userfiles/files/sebenimuta.pdfIn PDF document text
    • http://falconltd.pl/cache/file/zozuwizagazimokoru.pdfIn PDF document text
    • http://opuspointpartners.com/ckfinder/userfiles/files/50410897418.pdfIn PDF document text
    • https://bahceneryaman.net/public/content-images/files/14945641127.pdfIn PDF document text
    • https://kokomanis.com/contents/files/wokeragoruto.pdfIn PDF document text
    • https://vantainoidia.vn/ci/userfiles/files/fosevatesanabip.pdfIn PDF document text
    • http://anipetkingdom.com/webroot/img/files/bejak.pdfIn PDF document text
    • https://www.orthovision-lublin.pl/ckfinder/userfiles/files/romenogonabarinazisuwobov.pdfIn PDF document text
    • http://queenart.kr/userData/board/file/fupebosaxijoxobozuwu.pdfIn PDF document text
    • http://abwvictory.com/uploads/files/95987753123.pdfIn PDF document text
    • http://devison-matras.com/upload/file/72034744732.pdfIn PDF document text
    • http://ponozky.gultio.cz/webpagebuilder/ckfinder/userfiles/files/33036440728.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_off0000af79.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF79 14792 bytes
SHA-256: 8c909dd4233219d0f784d3e63e244324bb7eeb8859a1ab9fa0266da3dc4f5d8f
font_01_sfnt_off0000d489.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD489 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eca0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECA0 10348 bytes
SHA-256: b6b9526bc64bb653cc8e845fb537d728fc0ff947f86928433889c983b6327c22