Malicious PDF — malware analysis report

Static analysis result for SHA-256 40c899b9944716c1…

MALICIOUS

PDF

80.3 KB Created: 2021-09-19 06:43:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f8eb3a5fc9168c39f328979c3dca75a0 SHA-1: 7a3bb0e5863f371e4dfecd2224ce63e2937bb506 SHA-256: 40c899b9944716c1afbdd8103980af7564968e89c1d0a9050f685f2c8c123c6e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and heuristic firings point towards it being used as a lure to external malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://smidgel.ru/uplcv?utm_term=cheat+engine+android+without+root PDF link annotation
    • https://xcheck.vn/uploads/userfiles/file/99125526948.pdfIn PDF document text
    • http://swhos.com/upload/files/givinozusinagezulolizax.pdfIn PDF document text
    • http://jnmindia.com/outscapes/admin/ckeditor/uploads/ck/files/vosikufifuwezamaweguvuzi.pdfIn PDF document text
    • http://trufeel.com/ckeditor/ckfinder/uploadfile/files/80836565474.pdfIn PDF document text
    • http://www.propper-droppers.nl/files/file/luwirofunub.pdfIn PDF document text
    • http://oawebserver.com/piceditor/file/53664422414.pdfIn PDF document text
    • https://maffart-guy.com/userfiles/file/81672826207.pdfIn PDF document text
    • http://tauroconsulting.pl/userfiles/file/49993527880.pdfIn PDF document text
    • http://sinara.org.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613f0aec265e5---62779933437.pdfIn PDF document text
    • http://canhtoanland.com/upload/files/nudowulimotoparawepatum.pdfIn PDF document text
    • https://getracemirates.com/userfiles/files/32565433478.pdfIn PDF document text
    • https://egokituz.org/files/galeria/files/87665397639.pdfIn PDF document text
    • http://pate4me.com/userfiles/file/2871432813.pdfIn PDF document text
    • http://hidramaco.com/files/files/sozapevobunuteli.pdfIn PDF document text
    • http://machinegroup.ru/img/outer/files/puvilejuwuvazavazomarev.pdfIn PDF document text
    • http://hoya889.com/upfile/files/20210917000243.pdfIn PDF document text
    • http://rfaaa.com/UploadFile/file/20210915162653660.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/23158195660.pdfIn PDF document text
    • https://www.hs-hofgastein.salzburg.at/ckfinder/userfiles/files/85827667456.pdfIn PDF document text
    • http://hoangnampte.vn/quangbasanpham/app/webroot/upload/image/files/nipotewelabega.pdfIn PDF document text
    • https://daulte.com/ckfinder/userfiles/files/48430163355.pdfIn PDF document text
    • http://www.consorcio.edu.pe/wp-content/plugins/formcraft/file-upload/server/content/files/1612f2beac6ba7---77307903243.pdfIn PDF document text
    • http://emekyesiltepe.net/images_upload/files/rusemedu.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_off0000d7ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD7BA 10528 bytes
SHA-256: f4eb1878e02b18043c6dba90db13d34f8067cc72699b20bce5dd3d32649cb4b3
font_01_sfnt_off0000ef84.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEF84 16844 bytes
SHA-256: da4f4b7c348830c9791b9cc714a5c0605d55a3102a09a479d60043ef64842cce
font_02_sfnt_off00011b24.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B24 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.