Malicious PDF — malware analysis report

Static analysis result for SHA-256 7e82639ee167202b…

MALICIOUS

PDF

82.1 KB Created: 2021-09-15 23:32:05 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 21a1e4c5e978ac43b89a3d0e13c00516 SHA-1: 72b978f37c4706fa207649f4148addc07ba8a98c SHA-256: 7e82639ee167202b254b4f87015b6791b2159ada5f170b077b2ade6e94ca4fe2
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains embedded JavaScript and numerous external URIs, suggesting it functions as a link farm designed to redirect users to potentially malicious websites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

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 https://drafthe.ru/uplcv?utm_term=fundo+smartwatch+app+download PDF link annotation
    • http://stefanourso.com/public/userfiles/file/ponitekipanolibubasorek.pdfIn PDF document text
    • https://gencatakan.com/upload/file/68840559564.pdfIn PDF document text
    • http://xn--o39a91gvwm83kbsn.net/FileData/ckfinder/files/20210912_3B710E78B8A8ED0C.pdfIn PDF document text
    • https://bunyaminerdemir.com/resimler/files/41065419379.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/74882719183.pdfIn PDF document text
    • https://gamepinleri.com/calisma2/files/uploads/garopidobuw.pdfIn PDF document text
    • http://timebank.ru/sites/default/files/photos/pagefile/xudepudisotebogivojuner.pdfIn PDF document text
    • https://livewireeventz.com/userfiles/file/91143223032.pdfIn PDF document text
    • http://albarossa.jp/js/upload/files/90040318536.pdfIn PDF document text
    • https://megatex.ua/images/uploads/file/39545655984.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/17878546427.pdfIn PDF document text
    • http://www.marsagri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16139b8573dba0---tesujotoxenonuwororapejin.pdfIn PDF document text
    • http://www.gc-antey.ru/ckfinder/userfiles/files/debexukaresaj.pdfIn PDF document text
    • http://spielundlicht.de/content_provider/documents/files/82014935466.pdfIn PDF document text
    • https://surupaceanu.ro/ckfinder/userfiles/files/39266083996.pdfIn PDF document text
    • http://vpsystem.com/files/fck/43836594549.pdfIn PDF document text
    • https://maintogelonline2.com/contents/files/gifenetaxenidifumudixev.pdfIn PDF document text
    • http://tokyosushilohaus.com/uploads/files/foluzukafuz.pdfIn PDF document text
    • https://www.adoz.cz/ckfinder/userfiles/files/tireb.pdfIn PDF document text
    • http://sh8ke.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613dba3e96682---12579690034.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/zureguwi.pdfIn PDF document text
    • http://akcihlar.cz/userfiles/file/duzup.pdfIn PDF document text
    • http://egyptlance.com/userfiles/file/tisurijiriziximapiwebu.pdfIn PDF document text
    • https://spacio.hk/attachment/file/deserokawunoxiziniluzegak.pdfIn PDF document text
    • http://heimundsicherheit.de/userfiles/file/89058588203.pdfIn PDF document text
    • http://hglobaltour.com/FileData/ckfinder/files/20210910_7F48A9D10FBFFDBD.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_off0000dbfb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBFB 10716 bytes
SHA-256: 6652e0cff29a926c62c16b2aa8268a83a2f77e2bde71e69334842e6627ed0f7f
font_01_sfnt_off0000f471.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF471 18004 bytes
SHA-256: 1fbe6f134f0a6e7a7bf52a81bd1634dd4afd9a8b86542f471c596711aef839eb
font_02_sfnt_off000122a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1