Malicious PDF — malware analysis report

Static analysis result for SHA-256 ddc0e5c975a0fe9d…

MALICIOUS

PDF

78.4 KB Created: 2021-09-16 20:24:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: c466f005f4bde6e12427a603e45bc38c SHA-1: fc2cb1e5c294e3b19872763dc1ff943b93b186f2 SHA-256: ddc0e5c975a0fe9d30c265f4235fa79dce76922ebc6551a83bdce630bb423a1a
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV detection, indicating malicious intent. The 'SE_CLIPBOARD_COMMAND_LURE' heuristic suggests the document instructs users to copy and paste content into a shell, a common technique for executing malicious commands. The presence of numerous external URLs, many pointing to PDF files, indicates a potential phishing or credential harvesting attempt, possibly leading to further payload delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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
  • Clipboard command execution lure high SE_CLIPBOARD_COMMAND_LURE
    Document tells the user to copy or paste clipboard content into Run, PowerShell, cmd, or another shell-like execution context
  • 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://krisoc.ru/uplcv?utm_term=how+to+retrieve+deleted+files+from+internal+storage PDF link annotation
    • https://nutrishop.in/ci/userfiles/files/60073807614.pdfIn PDF document text
    • http://www.logistiekverbeteren.nl/ckfinder/userfiles/files/53270195182.pdfIn PDF document text
    • http://kapelski.pl/userfiles/file/puzilaf.pdfIn PDF document text
    • http://lyzph.com/userfiles/file/Fl202109060301242492.pdfIn PDF document text
    • http://begemot-rus.com/uploadfiles/file/2021090522152873499.pdfIn PDF document text
    • https://dusunceokulu.net/resimler/files/26806464825.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/18908180702.pdfIn PDF document text
    • http://unesco-mediain.cz/fckfiles/file/70365892997.pdfIn PDF document text
    • http://uniondrygoods.com/fckeditor/userfiles/file/jelawunimo.pdfIn PDF document text
    • https://network-italia.it/file/jexakamivofijidezutaki.pdfIn PDF document text
    • http://dc-a0dcf319a153.breakthroughsport.com/userfiles/files/54386118211.pdfIn PDF document text
    • http://montaze.org/democms/userfiles/file/65127527900.pdfIn PDF document text
    • http://fittbikese.hu/files/file/23331077560.pdfIn PDF document text
    • https://immo-macedo.lu/userfiles/files/xejanarevavuwaja.pdfIn PDF document text
    • https://stomatoloska-ordinacija-rijeka.com/files/91959818441.pdfIn PDF document text
    • http://lienming-rubber.com/uploads/files/202109152256033890.pdfIn PDF document text
    • http://cattaneoarchitetti.it/userfiles/files/49774450287.pdfIn PDF document text
    • https://www.paparazzirestaurant.com.au/wp-content/plugins/super-forms/uploads/php/files/28668f1cdbc6f3038e02535e9f29cccf/60771588638.pdfIn PDF document text
    • http://bedrucken24.de/userfiles/file/72093465299.pdfIn PDF document text
    • http://mesotects.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b0645a97dc---zonaxulevex.pdfIn PDF document text
    • https://www.tocbirsen.org.tr/ckfinder/userfiles/files/fegixanikof.pdfIn PDF document text
    • https://produktybhp.pl/pliki_user/File/sagenusaxef.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_off0000caea.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAEA 18308 bytes
SHA-256: 8dfbad48718858301b834f4887cd6b4a9e301a620fff34715cefadcce8095c9a
font_01_sfnt_off0000fad6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAD6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000112ed.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x112ED 10840 bytes
SHA-256: d808bbdbb39af8803b26a337354c9eb9299bac1e1c7ba41974409a333aa84c3a

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