Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a66c07ffac87db8…

MALICIOUS

PDF

68.5 KB Created: 2021-10-04 02:47:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 9e5ea0037b47a2e35cf1b896acd5ef3b SHA-1: 0c0a4d2104ba81270651316ce398c8c9052d3ea5 SHA-256: 1a66c07ffac87db86a385f63948f9c645343d6de7afc0340c68aaa2b5d108a39
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and a large number of external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware distribution. The embedded JavaScript is likely used to facilitate the redirection or exploit vulnerabilities.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://metrosecuritynepal.com/assets/userfiles/files/36501530111.pdf In PDF document text
    • http://bjyhyy.cn/filespath/files/20210923140535.pdfIn PDF document text
    • http://abnigakgdsg.friendship-match.com/upload/files/jizorigot.pdfIn PDF document text
    • http://chochosanencino.com/uploads/files/wapirazegekoxozaginotu.pdfIn PDF document text
    • http://recamonde.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1612f0d0e9ef01---kawafuwarupitigubiwonimem.pdfIn PDF document text
    • http://shiinamotors.com/js/upload/files/11814758135.pdfIn PDF document text
    • https://auditorescr.com/ckfinder/userfiles/files/dedifivujege.pdfIn PDF document text
    • http://headlinesdinerla.com/uploads/files/53854112980.pdfIn PDF document text
    • https://picinterior.com/ckfinder/userfiles/files/munazoxawe.pdfIn PDF document text
    • https://bearings.vn/images/ckeditor/files/99395990082.pdfIn PDF document text
    • https://www.hospedeagora.com.br/wp-content/plugins/super-forms/uploads/php/files/sq1581r4gh1j93eie5bvviof5c/30697062608.pdfIn PDF document text
    • http://kahounova.cz/userfiles/file/lotevilurowitagir.pdfIn PDF document text
    • https://ego-sofa.tw/uploads/files/202109232059459276.pdfIn PDF document text
    • http://studiopiergentili.it/userfiles/files/kizagilewalumorod.pdfIn PDF document text
    • http://xn--2e0b30g3uq7pay7m.com/upload/fckeditor/file/buruxerat.pdfIn PDF document text
    • http://sns-russia.ru/userfiles/file/86597055461.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/8274841275.pdfIn PDF document text
    • https://chaletsuenodesol.de/files/tulajugulepotovonem.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/99781351779.pdfIn PDF document text
    • http://briztravel.com/upload/files/zakavo.pdfIn PDF document text
    • http://cameranichietsu.com/luutru/files/64724358506.pdfIn PDF document text
    • http://splogservice.ru/content/files/kufumesodek.pdfIn PDF document text
    • https://dadesigning.com/daduserfiles/files/9701855686.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/30777163111.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=fitness+quest+edge+491+manualPDF 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_off0000ae22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE22 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c639.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC639 10892 bytes
SHA-256: 83766b9b60263605fc6892392ecf819bfa33e18bd54fd362dc1412743d566fe2
font_02_sfnt_off0000def1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDEF1 14552 bytes
SHA-256: 6444cf8758e1429d79b925eff807c516b5e3037aae2d2c5ebf08cba6974597f4