Malicious PDF — malware analysis report

Static analysis result for SHA-256 d733bffc031fec02…

MALICIOUS

PDF

80.9 KB Created: 2021-09-12 15:05:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: e6873ad315c971ec3685fbbdf92f78ce SHA-1: e0e40474faebaf642d6209879cca8e4c9c663b3a SHA-256: d733bffc031fec024a57b2f80ac536df3d59e89668c36121bacd25ffbcbd7785
134 Risk Score

Malware Insights

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

This PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier with high confidence. It contains embedded JavaScript and numerous external URIs, including one pointing to a potential phishing lure related to 'a quiet place part 2 online stream'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a pattern of using disposable hosting for multiple links, suggesting a campaign to distribute malicious content or redirect users to phishing sites. The embedded JavaScript likely facilitates the redirection or exploitation process.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9984

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://pistant.ru/uplcv?utm_term=a+quiet+place+part+2+online+stream PDF link annotation
    • http://scandirent-new.ru/uploads/assets/file/nikulu.pdfIn PDF document text
    • http://yournamebadges.com/withyourdog/cms_uploads/file/tagetoberimorutudusokap.pdfIn PDF document text
    • http://architettoannalisatinelli.it/userfiles/files/93337629927.pdfIn PDF document text
    • https://atavio.ru/files/file/46106152081.pdfIn PDF document text
    • http://builderall.info/userfiles/file/11172932812.pdfIn PDF document text
    • http://jiachuankeji.com/upload_fck/file/2021-9-2/20210902213419904985.pdfIn PDF document text
    • https://gulfb2b.com/userfiles/file/pulaworarurowulosagorofep.pdfIn PDF document text
    • http://bixenony.com/userfiles/files/56842973418.pdfIn PDF document text
    • https://avigailpekelman.com/sites/default/files/file/34877132939.pdfIn PDF document text
    • http://pytextiles.com/userfiles/file/degidoxajixoluwimuba.pdfIn PDF document text
    • http://sanruou.com/app/webroot/uploads/files/netodule.pdfIn PDF document text
    • http://moonlightmontessori.com/upload/files/71669585081.pdfIn PDF document text
    • https://livnica-metalurg.com/images/pages/file/93990759928.pdfIn PDF document text
    • http://naosgym.com/userfiles/files/zegevujobegobadinupavuf.pdfIn PDF document text
    • http://gongotour.com/FileData/ckfinder/files/20210906_D6AAD401F21C4E38.pdfIn PDF document text
    • https://velvetskin.pl/wp-content/plugins/super-forms/uploads/php/files/dff0b56a794c746b8d311bdb26db32b3/miboki.pdfIn PDF document text
    • https://odlingfamily.com/userfiles/file/85507780664.pdfIn PDF document text
    • https://i-chat.tw/js/ckfinder/userfiles/files/pifatawofofokivumuz.pdfIn PDF document text
    • https://sistemagestiondpr.co/userfiles/file/93974950697.pdfIn PDF document text
    • http://ressourcengarten.de/azubi/userfiles/files/puxoxipotanuzuviwitiwa.pdfIn PDF document text
    • http://yejida.com/userfiles/file/xogejinegijexoji.pdfIn PDF document text
    • http://resortcrimea.com/ckfinder/userfiles/files/15967848150.pdfIn PDF document text
    • http://drprdesaihospital.com/uploads/wonobawetewusafepije.pdfIn PDF document text
    • https://conexkarvan.com/cache/fck_files/file/27070373622.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/62451318927.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_off0000d686.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD686 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ee98.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE98 17428 bytes
SHA-256: 8277171c4e4aa0de6a556feacdb31fab09cbc5f4a9b3791d8e3b976f57fe3da7
font_02_sfnt_off00011c0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C0E 10884 bytes
SHA-256: 10e5251e503e938f3148cf68d45190b1fb887a7de5038cafa8404c13ab75298c