Malicious PDF — malware analysis report

Static analysis result for SHA-256 c5fdb7f94399c3f4…

MALICIOUS

PDF

72.6 KB Created: 2021-09-21 04:58:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: da46e71e96df686b519388c40d18583a SHA-1: 2755cb9c9aa1ecf88eeab0828888af201c38339f SHA-256: c5fdb7f94399c3f4cd67b7d219bed61a07281f82c8224b8f7b0ff47df88e760a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which point to domains that appear to be part of a link farm, suggesting a phishing or malware distribution scheme. The presence of multiple distinct hosts and the use of UTM parameters in some URLs further support this assessment.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://crewmak.ru/uplcv?utm_term=mobi+sports+apk PDF link annotation
    • https://yenhuy.vn/upload/files/21678625145.pdfIn PDF document text
    • http://cuacuonnhaxuongbinhduong.com/upload/files/10797300920.pdfIn PDF document text
    • http://thepokeluau.com/uploads/files/vutivaxenabutupavexaromix.pdfIn PDF document text
    • http://lerucherdesanges.fr/userfiles/file/76251842136.pdfIn PDF document text
    • https://shipnhanh247.vn/asset/files/serexomosokatud.pdfIn PDF document text
    • http://www.absolutecateringla.com/wp-content/plugins/formcraft/file-upload/server/content/files/16143520c3ead1---71916141718.pdfIn PDF document text
    • https://www.speeddating.lt/speeddating/ckfinder/userfiles/files/49986951758.pdfIn PDF document text
    • http://pospatrans.cz/UserFiles/File/1201069649.pdfIn PDF document text
    • http://mdbim.pl/ubezpiecz/obrazy/file/69532373279.pdfIn PDF document text
    • http://cravaluos.com/ckfinder/userfiles/files/95634357839.pdfIn PDF document text
    • http://quaisetoiles.fr/img_pages/file/xefipuvu.pdfIn PDF document text
    • http://resetimpianti.it/reset/public/file/87148697848.pdfIn PDF document text
    • https://7mark3t2-7aya.com/contents/files/xuvijofiwozopatet.pdfIn PDF document text
    • http://2015.letnifestiwal.pl/ckfinder/userfiles/files/pavafilimi.pdfIn PDF document text
    • https://www.tamilsaga.com/ckfinder/userfiles/files/vojinubobuguvokimepituko.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/tudekokuro.pdfIn PDF document text
    • http://orel-trinity.ru/sites/default/files/file/rivitujo.pdfIn PDF document text
    • http://agro-pasz.pl/ckfinder/userfiles/files/pexirozukamusisomotimebek.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16141d467700a8---24304546123.pdfIn PDF document text
    • http://fullx.net/files/tawudijoziduxeg.pdfIn PDF document text
    • https://fundacionamigosdelmarcaribe.ong/ckfinder/userfiles/files/betugufexixuv.pdfIn PDF document text
    • http://biogenetec.tw/image/files/20210902_203802.pdfIn PDF document text
    • http://parentini.it/userfiles/files/dulutinizewikujikozazadot.pdfIn PDF document text
    • http://jmk.kr/ckfinder/userfiles/files/kifiwasis.pdfIn PDF document text
    • https://latework.cz/soubory/tududosibiziroboveti.pdfIn PDF document text
    • http://mamtaniketan.com/userfiles/file/garigezopufedojugunuxex.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_off0000b9c2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB9C2 10188 bytes
SHA-256: b2d0cfae7573bde07605ce1899bc033843d04f4272c7064e4c080c518c6c9fd5
font_01_sfnt_off0000d087.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD087 17116 bytes
SHA-256: b4193e16a46c15823ee73db97783781c74ebfe2f4ac70d2a6ed52a706e71103d
font_02_sfnt_off0000fd15.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFD15 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1