Malicious PDF — malware analysis report

Static analysis result for SHA-256 56f3f99a083bd297…

MALICIOUS

PDF

75.5 KB Created: 2021-09-12 07:47:09 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 779fe8e86ac695b9cd2ae951f726e1d9 SHA-1: 2a07d2a02376b11578bc70bb2e0454327b928a58 SHA-256: 56f3f99a083bd297da0ed6bdfdf4f983335069443dfdb04ddeb2548bd67bb8af
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, indicating a high likelihood of malicious intent. It contains numerous external URIs and embedded URLs pointing to various domains, suggesting a link farm or phishing lure. The presence of PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports the idea that these links are used to redirect users to potentially harmful content. No scripts were extracted, but the overall structure and heuristic firings point towards a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9963

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://wastran.ru/uplcv?utm_term=world+cricket+championship+lt+android PDF link annotation
    • http://architettosbaffo.com/userfiles/files/61329353318.pdfIn PDF document text
    • https://greenbins.ca/ckfinder/userfiles/files/19124207788.pdfIn PDF document text
    • http://p-itos.net/admin/userfile/image/file/filagugeda.pdfIn PDF document text
    • http://soskuwait.com/outscapes/admin/ckeditor/uploads/ck/files/debeniwubidujixojaf.pdfIn PDF document text
    • http://1hozain.ru/files/userfiles/files/9787286884.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/1537743191613837fbc6222.pdfIn PDF document text
    • https://lexcochoralsoc.org/demo/lccs/beta/userfiles/files/gamimufiwu.pdfIn PDF document text
    • http://w-w.cn/isee/pfm/cms/uploadfile/fck/file/tepaxedufopurugajexug.pdfIn PDF document text
    • https://coloreverything.love/wp-content/plugins/super-forms/uploads/php/files/d7bbd1186cfeb8cf5eb7a99935cd7d3d/38464201047.pdfIn PDF document text
    • https://www.novet.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613407b598bbc---72677366411.pdfIn PDF document text
    • https://preciseenergygroup.com/media/34538945876.pdfIn PDF document text
    • http://acevina.com/webroot/img/files/53944558066.pdfIn PDF document text
    • http://sdv.sk/userfiles/articles/file/76412055315.pdfIn PDF document text
    • https://aprilboya.com/userfiles/file/nulawedojosunepezurox.pdfIn PDF document text
    • http://mingmitrcoffee.com/user_img/files/sasixufelafenewil.pdfIn PDF document text
    • http://podushka.by/files/files/26652263835.pdfIn PDF document text
    • http://22vek-omsk.ru/fck_editor_files/files/95645832771.pdfIn PDF document text
    • http://incomsistema.ru/ckfinder/userfiles/files/73426325656.pdfIn PDF document text
    • http://aptwash.com/userData/ebizro_board/file/zikabavejaboxonasedogowad.pdfIn PDF document text
    • http://engroupe.ca/aym_image/files/67921170560.pdfIn PDF document text
    • https://deltarents.com/upload/ckfinder/files/suvuzorifez.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/setivazonazupipejumimub.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_off0000c1d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC1D9 10864 bytes
SHA-256: 4f318e3957af151fc0e143d610df63ade13b33f5acdbebde329066deb706be16
font_01_sfnt_off0000dabf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDABF 17736 bytes
SHA-256: ba5cba8d573bd36c3b193c2cbef0e00d855c7ba79dc58a948b2b4f8717f98efd
font_02_sfnt_off0001089b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1089B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1