Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc1ea8e944c4d721…

MALICIOUS

PDF

80.9 KB Created: 2021-09-20 00:32:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: b1d804246c4b03c579f2425cec6481c2 SHA-1: f5b81f600e6f1f7249935100c3cef68e3d11c25a SHA-256: cc1ea8e944c4d721c2106e035bde15ec8cfe301c66b499cf5ff73593c12a6f8b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ClamAV as Pdf.Phishing.Trojan and by an ML classifier as malicious. It contains numerous embedded URLs, many of which point to disposable domains, and a heuristic indicates it's a link farm. The presence of a 'download button' lure further suggests a phishing or malware distribution attempt. While no scripts were explicitly extracted, the PDF structure and embedded links are indicative of an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://allytemp.ru/uplcv?utm_term=mod+game+hill+climb+racing+2 PDF link annotation
    • http://stihoplet.by/upload/editor/files/42215132605.pdfIn PDF document text
    • https://drhuanghair.com/uploads/files/202109020842459421.pdfIn PDF document text
    • http://kayapalinakliyat.net/file/11279524007.pdfIn PDF document text
    • http://lightofislamonair.org/uploads/files/guxetoju.pdfIn PDF document text
    • http://suaups.net/userfiles/file/7815551858.pdfIn PDF document text
    • http://bellina.pl/userfiles/file/sunugemi.pdfIn PDF document text
    • http://pelejas.com/IMAGENS/CKFINDER/files/74821912329.pdfIn PDF document text
    • https://swapnauraan.com/ckfinder/userfiles/files/29280976248.pdfIn PDF document text
    • http://terralis.net/catalogue_dynamique/file/tetobive.pdfIn PDF document text
    • https://pbchistoryonline.org/uploads/file/mupetonadelixaxa.pdfIn PDF document text
    • http://alarmy-kamery24.pl/userfiles/file/ropuzirebilalele.pdfIn PDF document text
    • https://gelblighting.com/userfiles/files/38287243358.pdfIn PDF document text
    • https://www.hdontheroadnapoli.it/wp-content/plugins/formcraft/file-upload/server/content/files/1612f799a8a1e3---bovonudetinobeziliwij.pdfIn PDF document text
    • http://exactblue.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613eadade9d3e---tufimofutesukipasaf.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/92593535970.pdfIn PDF document text
    • http://energywork.pl/userfiles/file/14352391227.pdfIn PDF document text
    • http://apsara.ru/userfiles/file/resuvugoguz.pdfIn PDF document text
    • http://hk-bbc.com/upload/file/xukewosotetizoxodezizapab.pdfIn PDF document text
    • https://worldcastlive.com/userfiles/file/26499670025.pdfIn PDF document text
    • https://landatur.com/files/galeria/files/42717400244.pdfIn PDF document text
    • http://xn----otbb6ahq3d.xn--p1ai/ckfinder/userfiles/files/29167666519.pdfIn PDF document text
    • https://ldoris.com/upfile/files/20210920053006.pdfIn PDF document text
    • http://knowleangling.co.uk/ckfinder/userfiles/files/tuferu.pdfIn PDF document text
    • http://expresskaliski.info/file/68420214244.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_off0000d763.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD763 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ef7a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF7A 10804 bytes
SHA-256: ad7da517c8b49cdb2dbd4291b457a85a360c0f5dd33127d0f8b5840228d2933b
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 17728 bytes
SHA-256: 8cc321c4318f97aaf4d615937bed6143b77ad95ffed0b522b66de36761f4ce76