Malicious PDF — malware analysis report

Static analysis result for SHA-256 2a016e71bcbc7e89…

MALICIOUS

PDF

80.5 KB Created: 2021-09-15 09:53:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 90951ae19a85eb7afecb9a96009b0166 SHA-1: 6dd23708e7ebbf09c3125c8bb7e646fc0d8f6cc9 SHA-256: 2a016e71bcbc7e89cbd29216583d0263be19bba2d4aee47a90c00791df7154eb
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection for 'Pdf.Phishing.Trojan'. The presence of numerous embedded URLs, many pointing to disposable domains, strongly suggests a phishing or malware distribution campaign. The ML classifier also indicated a high probability of maliciousness.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9960

Heuristics 5

  • 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.
  • 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://ketchas.ru/uplcv?utm_term=watch+dragon+ball+super+heroes+online PDF link annotation
    • http://xn--9p4b29dncp2cc6y.net/upload/fckeditor/file/pojanosaf.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/21945421806.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/buwunibofanuxurafezofetuz.pdfIn PDF document text
    • http://netisiletisim.com/guvennet/resimlerfiles/10242990305.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/8062676591.pdfIn PDF document text
    • http://aexpress.lv/index/images/up/file/gunupusulixenobiw.pdfIn PDF document text
    • http://ilkemymm.com/image/files/gizagegudigetupojaxudoreb.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/48al5ft0i1rmeha3b3vo8phpq7/99366395253.pdfIn PDF document text
    • https://markmont.eu/editor_uploads/system/files/84849250764.pdfIn PDF document text
    • http://tfforming.ru/d/files/wadilusevegawuzomof.pdfIn PDF document text
    • http://donovaly-ubytovanie-safran.sk/web/userfiles/file/wizivajajitojajosuwidofe.pdfIn PDF document text
    • https://benhgout.net/uploads/Files/file/59211074226.pdfIn PDF document text
    • https://drinkpoint.com/uploads/files/jedukubifulusogop.pdfIn PDF document text
    • https://10kshot.com/customerinterview/ckfinder/userfiles/files/zifunonemizenepewivo.pdfIn PDF document text
    • https://telliogluhukuk.com/userfiles/file/81442593938.pdfIn PDF document text
    • http://gaudi.tw/upload/files/lixuliludaramemuso.pdfIn PDF document text
    • http://aurora-c.jp/files/files/gitoja.pdfIn PDF document text
    • https://www.birdandwildlifeteam.com/wp-content/plugins/formcraft/file-upload/server/content/files/161303e8858a91---denixezuwojibazes.pdfIn PDF document text
    • http://maility.pl/_ADRESuserfiles/file/puwexuxajajajibilide.pdfIn PDF document text
    • http://yuli-china.ru/d/files/74776117787.pdfIn PDF document text
    • http://flirdining.com/uploads/files/2808753494.pdfIn PDF document text
    • https://georeno.ca/userfiles/files/xokoxowum.pdfIn PDF document text
    • http://vector-mebel.ru/uploads/files/ropukudunoxop.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_off0000d497.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD497 11024 bytes
SHA-256: aa462040b961097403c63e381d0100811439dd1e33d0dcc191d902328aeeacf6
font_01_sfnt_off0000edbe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDBE 17824 bytes
SHA-256: e49554ad0d0a276863a019df91bdf51e711fd38332e46e4185b8badb71275449
font_02_sfnt_off00011c1e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11C1E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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