Malicious PDF — malware analysis report

Static analysis result for SHA-256 970865a5af1139d2…

MALICIOUS

PDF

85.9 KB Created: 2021-09-15 19:13:10 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 00b3c715c45994891566c42c89b75307 SHA-1: 0d9c79e703a9ce9ef9c1fe67a1ea96bcc811b836 SHA-256: 970865a5af1139d256c2967b20bc6862e624b39915c2adc7df37f1bb212bf312
134 Risk Score

Malware Insights

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

The PDF contains numerous embedded URLs, many of which are part of a link farm designed to redirect users to potentially malicious content. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution. The heuristic 'SE_DOWNLOAD_BUTTON' suggests a lure to trick users into downloading the file, which is then identified as a 'Pdf.Phishing.Trojan'.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://huntic.ru/uplcv?utm_term=lol+wild+rift+apk+latest PDF link annotation
    • http://mwflower.com/upimagesfile///sabiseduker.pdfIn PDF document text
    • http://coimbra.hu/uploads/ckfinder/userfiles/files/fetew.pdfIn PDF document text
    • https://micsys.in/userfiles/file/guborekorakirakelelor.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/f5f8d293f61c75c8a5e5faebea92efa2/dudujalanobiwelazowokitoj.pdfIn PDF document text
    • http://dishandspoonproductions.com/ckfinder/userfiles/files/78037128086.pdfIn PDF document text
    • https://begili.com/uploads/image/files/17977190703.pdfIn PDF document text
    • http://homeopathyhongkong.org/files/89886470281.pdfIn PDF document text
    • http://vangphutai.com/images/uploads/files/wamumav.pdfIn PDF document text
    • http://aucoindeshalles.fr/menu/file/dinegukamovugebofejamive.pdfIn PDF document text
    • https://diphong.com/uploads/62554955413.pdfIn PDF document text
    • https://nezrenweb.com/calisma2/files/uploads/43910334672.pdfIn PDF document text
    • https://inunekocp.jp/mailmagazine/upload/files/61844024785.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/wotikuvij.pdfIn PDF document text
    • http://speakingaboutnetworking.com/ckfinder/userfiles/files/23778623869.pdfIn PDF document text
    • http://ohadalegistrocbarter.com/ckeditor/uploads/files/xijajonowinidozal.pdfIn PDF document text
    • http://fusheng-vietnam.vn/admin/webroot/upload/image/files/rusilateminejaxije.pdfIn PDF document text
    • https://ceccargiurgiu.ro/userfiles/file/vefanorofisifegomo.pdfIn PDF document text
    • http://montpellier-business-plan.eu/mbp/upload/images/images/upload/ckfinder/62367554952.pdfIn PDF document text
    • http://nawooelcs.com/upload/userfiles/2021/09/files/210902201104.pdfIn PDF document text
    • http://urbanelect.com/userfiles/file/87917459038.pdfIn PDF document text
    • https://takiminsahada.com/wp-content/plugins/super-forms/uploads/php/files/sdg7crceqlkkucbls4eqffc1ea/deximujalotirazo.pdfIn PDF document text
    • http://www.dogwoodagility.nl/ckfinder/userfiles/files/dedigixufadamosokisibav.pdfIn PDF document text
    • https://stiglic.sk/userfiles/file/5234919918.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/74507821123.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_off0000eb15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010327.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10327 18088 bytes
SHA-256: 0682b4f1c764c8f0ae2209b12768b5afef387a033ff6cb331aefe744fb3f8a76
font_02_sfnt_off000131c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C2 10524 bytes
SHA-256: 34061d6523e1ccf52dba92cf8bd07e1434a088490addc32819e8d3b534b44fb4