Malicious PDF — malware analysis report

Static analysis result for SHA-256 8703c39b6d5b0c12…

MALICIOUS

PDF

86.1 KB Created: 2021-09-20 05:42:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f6a93580a16425fef424e376dc7055e2 SHA-1: ee5bf8fe3098cec95ce3c60514896c52ba35a354 SHA-256: 8703c39b6d5b0c129bc50ee819eef49e48a9e7fd6c54f5f56d9412a4e06d1aff
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a large number of external URIs, many hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is likely used to facilitate the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=how+to+hack+offline+games+on+android PDF link annotation
    • http://888chji.com/userfiles/files/motoxatavedodevij.pdfIn PDF document text
    • https://doxity.ro/ckfinder/userfiles/files/28565614057.pdfIn PDF document text
    • http://phucuongplus.com/upload/files/dexujifekapititov.pdfIn PDF document text
    • http://www.hydro-tg.pro/upload/file/77485328008.pdfIn PDF document text
    • https://huaku3c.tw/uploads/files/202109171458432100.pdfIn PDF document text
    • http://hanart21.com/files/userfiles/file/kixofit.pdfIn PDF document text
    • https://www.grecosalesinternational.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b24b15e405---rapomasotiguxosowaze.pdfIn PDF document text
    • http://giaphatmed.com/upload/file/lewivi.pdfIn PDF document text
    • http://gonvvama.net/filespath/files/20210913124752.pdfIn PDF document text
    • http://www.thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/59703420362.pdfIn PDF document text
    • http://alvit-bk.ru/userfiles/file/39740648418.pdfIn PDF document text
    • https://yourwebcenter.com/files/file/47518247147.pdfIn PDF document text
    • http://rszm88.com/upfolder/e/files/20210901212532.pdfIn PDF document text
    • https://calprin.com/ckfinder/userfiles/files/rupikolowazarali.pdfIn PDF document text
    • https://cardolf.ro/files/wegogakawujusutojenasi.pdfIn PDF document text
    • http://quantri.thaisonpalacehotel.com/upload/files/20575179112.pdfIn PDF document text
    • https://mosallaesf.ir/uploads/ck/files/3575323978.pdfIn PDF document text
    • https://sananselmo.com/wysiwygfiles/file/vepudozaliv.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/44318139734.pdfIn PDF document text
    • http://sooam.com/files/fckeditor/file/2101140484613f40333012b.pdfIn PDF document text
    • http://budaikepkeret.hu/uploads/file/66638215807.pdfIn PDF document text
    • http://www.anglometais.com.br/adm/Editor/ckfinder/userfiles/files/5238261676.pdfIn PDF document text
    • https://mehfermobilsaglik.com/userfiles/file/8775572077.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_off0000ee3e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEE3E 16664 bytes
SHA-256: 945c083b90678d270fef3a263df004c3d2245771ced8cf9a11afe5d6a387e13f
font_01_sfnt_off00011937.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11937 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001314e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1314E 11092 bytes
SHA-256: b7e33529a59784cbebc0f8593c1f26ecc15adae97d52b30d62afdc0294c8decd

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