Malicious PDF — malware analysis report

Static analysis result for SHA-256 68b4eb2426567747…

MALICIOUS

PDF

69.8 KB Created: 2021-10-04 07:10:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-23
MD5: 6eeeface70b6cabd720a781bb6716b52 SHA-1: e7dd777359a4ab530486d610162dedd7a444cc86 SHA-256: 68b4eb2426567747ae9563bf3461d638d36c67be3c2a008d0dda3b7ec4523a4e
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF containing embedded JavaScript, which is a common technique for executing malicious code. It also features a large number of external URLs, many of which are hosted on disposable domains, indicating a link farm designed to redirect users. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://chcial.ru/uplcv?utm_term=all+day+panic+attack PDF link annotation
    • http://agierresrl.it/userfiles/files/27902964787.pdfIn PDF document text
    • https://glearningsolutions.com/userfiles/files/xorozuraraxosabofefo.pdfIn PDF document text
    • http://khodahoanglang.com/admin/webroot/upload/image/files/wudoxezebexej.pdfIn PDF document text
    • http://kite-surf.sk/files/xenejo.pdfIn PDF document text
    • https://granitabrasive.ro/editor_up/pemibi.pdfIn PDF document text
    • https://wscnaturalhealings.com/wp-content/plugins/super-forms/uploads/php/files/d9a65351ea63eb59bcae104b0eec25b4/sezemakukutotigedar.pdfIn PDF document text
    • http://nova-auto.com/upload/92451746163.pdfIn PDF document text
    • http://dh-cell.net/ckfinder/userfiles/files/zimudupadibeduragelopina.pdfIn PDF document text
    • https://relans-nn.ru/images/docs/file/32760994515.pdfIn PDF document text
    • http://becskeicsodajo.hu/admin/fck_upload/file/zumabixetovuma.pdfIn PDF document text
    • http://szkolaprywatnaleszno.pl/userfiles/file/dopesofor.pdfIn PDF document text
    • http://lmtechsolution.com/userfiles/mebakajom.pdfIn PDF document text
    • https://meritumptt.pl/dokumenty/file/pudozosage.pdfIn PDF document text
    • http://garage-fuji.jp/js/upload/files/nejemimarojupuribavipotu.pdfIn PDF document text
    • http://kythuatviet.vn/uploads/userfiles/file/40246275069.pdfIn PDF document text
    • https://gujaratisamajparis.org/upload/files/70916617360.pdfIn PDF document text
    • https://magyar-logyogyasz.hu/fileok/file/movoref.pdfIn PDF document text
    • http://theurbanbazzaar.com/userfiles/file/wubopisemaratu.pdfIn PDF document text
    • https://www.baileysmilk.com/wp-content/plugins/super-forms/uploads/php/files/d31579d283d6ed59544587dd24210b64/jowajatafudoxubuwu.pdfIn PDF document text
    • http://ecovn.vn/uploads/news_file/zonasobibokojaxora.pdfIn PDF document text
    • https://sabagdasarov.ru/upload/file/22767208879.pdfIn PDF document text
    • https://vongtaytramhuong.vn/upload/files/42125789006.pdfIn PDF document text
    • http://www.groupementpecheduloir.com/ckfinder/userfiles/files/liderisatuk.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_off0000b0cb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0CB 10172 bytes
SHA-256: b21dae1b913751626b02acb8106d9f71bb5fee367c0bc02b87bae5272397cfd3
font_01_sfnt_off0000c7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7AF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000dfc1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFC1 16448 bytes
SHA-256: 1efaff2a424bf1a9e4374ee4a48bdfe80755ff18c749bdf8a89f6d7f7f4bb74b

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