Malicious PDF — malware analysis report

Static analysis result for SHA-256 e59ebe6cbf8aa0fe…

MALICIOUS

PDF

81.8 KB Created: 2021-09-18 16:46:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 4e94ccd0de4c533a458e682c244334fc SHA-1: 474eaaacbfe60c47f9b006ce10d3bdd3172e85b0 SHA-256: e59ebe6cbf8aa0fef86c9d61e0f3bcf98aa08a1d67a6e12238d178edbe41b1de
146 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the malformed stream length and URI heuristics suggest exploitation or redirection attempts.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • Malformed active-content stream length medium PDF_MALFORMED_EXPLOIT_STREAM_LENGTH
    A PDF stream that carries active/exploit-looking content has a declared /Length that does not match the recovered stream body. Malformed stream boundaries and length mismatches are common parser-evasion/supporting evidence around Reader exploit streams.
  • 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://allytemp.ru/uplcv?utm_term=cara+download+game+ps1+di+hp+android PDF link annotation
    • https://lanhcongnghiepthinhphat.com/upload/files/99853787843.pdfIn PDF document text
    • https://ourlady-schools2.com/userfiles/files/26707875121.pdfIn PDF document text
    • https://homestayhoian.thamtuddt.com/uploads/image/files/ketidobilenonob.pdfIn PDF document text
    • https://fruitssupplier.com/app/webroot/img/files/soxoj.pdfIn PDF document text
    • http://noithatdangcap.vn/app/webroot/uploads/files/63233949298.pdfIn PDF document text
    • http://ccadl.com/files/20210911140005.pdfIn PDF document text
    • http://jlssj.com/qianzi/upfile/case_editor/file/gatopuwogufixonazexosopem.pdfIn PDF document text
    • http://rlangkhan.com/upload/userfiles/files/64838871264.pdfIn PDF document text
    • http://inlovehuahin.com/file_media/file_image/file/wavoxe.pdfIn PDF document text
    • https://lacgl.org/upload/editor/file/liwelaxipuwozuvubew.pdfIn PDF document text
    • http://kancelaria-perfect.pl/app/webroot/media/files/49631644147.pdfIn PDF document text
    • https://thic.muki001.com/plugin/ce1/ckfinder/userfiles/files/92665028506.pdfIn PDF document text
    • http://krasneclanky.cz/uploads/33988045173.pdfIn PDF document text
    • https://www.idd.no/ckfinder/userfiles/files/detepizizelufuvafosezina.pdfIn PDF document text
    • http://dautuck.com/uploads/userfiles/file/serejokavaw.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/161370a6dd4a2e---federosajix.pdfIn PDF document text
    • http://sz-nuoyi.com/Upload/file/2021090615571628802.pdfIn PDF document text
    • http://insfilings.com/skyzone_classic/upload/files/20886972265.pdfIn PDF document text
    • http://kelvista.lt/images/files/ponoripanipexodewefi.pdfIn PDF document text
    • http://autoscuolapezzano.it/userfiles/files/setukodidukikojexawu.pdfIn PDF document text
    • http://intelekt.biz/uploads/pages/files/fakapimovurulepaneba.pdfIn PDF document text
    • https://mancomunidadvaldizarbe.com/userfiles/files/nikivunugumari.pdfIn PDF document text
    • http://3colorjazz.com/fckeditor/userfiles/image/62653711601.pdfIn PDF document text
    • https://daaeportrett.no/upload/file/21401644992.pdfIn PDF document text
    • https://hippodrome-compiegne.fr/www/uploads/file/zowaxurinoxuki.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_off0000dbb2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBB2 17260 bytes
SHA-256: 894fd34395229e7e10cde04a0997cc72d9ab71fd7f9575ecc061dda14d503240
font_01_sfnt_off0001086f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1086F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00012086.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12086 10912 bytes
SHA-256: 289acf0ed2826297718f3bc1e021d9b43d2b1f3456a0fa48a02317e0e1f0046d