Malicious PDF — malware analysis report

Static analysis result for SHA-256 35e86667d682b40c…

MALICIOUS

PDF

82.5 KB Created: 2021-09-14 06:27:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: bc970d3fc1b66e2ee28cb6e45b8ef7a8 SHA-1: 82279ed634bf5a8230f60830e1d366215a6c9498 SHA-256: 35e86667d682b40cf6be886da8dd1c935818da42030d992c8c0723b270e86114
134 Risk Score

Malware Insights

MITRE ATT&CK
T1059.007 JavaScript T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' and the numerous unknown URLs suggest a phishing or spam campaign. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://myphi.biz/nbloom/fckuploads/file/36418437012.pdf In PDF document text
    • http://modellszerviz.hu/userfiles/file/jokafuzufemove.pdfIn PDF document text
    • http://skulpt.in/admin/uploads/file/subewuxitokewedide.pdfIn PDF document text
    • https://investincarpathians.eu/app/webroot/media/files/jizirujikage.pdfIn PDF document text
    • http://ac-kenigsberg.ru/files/file/gemonivevovo.pdfIn PDF document text
    • http://cestovni-postylka.eu/userfiles/file/zosawi.pdfIn PDF document text
    • http://slowjamsundays.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b19864c8c8---vajafutezesuza.pdfIn PDF document text
    • http://yeosingol.com/FileData/ckfinder/files/20210908_5B1D1FF6F29E026C.pdfIn PDF document text
    • https://fundoohairstyles.com/hairstyler/images/file/96391644164.pdfIn PDF document text
    • https://tramhuonghanoi.vn/upload/files/fasegobux.pdfIn PDF document text
    • https://nepalmicrofinancesummit.org/userfiles/files/89643629864.pdfIn PDF document text
    • http://www.jacenter.org/js/ckfinder/userfiles/files/kurutawodipunakum.pdfIn PDF document text
    • http://motopujcovnateplice.cz/userfiles/file/80559565141.pdfIn PDF document text
    • http://metapolar.hu/tmp/biwexejufow.pdfIn PDF document text
    • http://aal.tw/uploads/htmlupload/files/gutoropapozewuvati.pdfIn PDF document text
    • http://minhledtran.com/luutru/files/41260307474.pdfIn PDF document text
    • http://jutaek.humenia.com/upload/userfiles/2021/09/files/210906145456.pdfIn PDF document text
    • http://busto-wl.gattinonimondodivacanze.it/themes/userfiles/files/safedewazuvigozizowarig.pdfIn PDF document text
    • http://clinivetmadonnadirosa.eu/userfiles/files/povusurexamog.pdfIn PDF document text
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161400653a5080---47989758999.pdfIn PDF document text
    • https://pepinieramontana.ro/ckfinder/userfiles/files/45445204941.pdfIn PDF document text
    • http://skia22.ru/pic/file/wevexepor.pdfIn PDF document text
    • https://hondaotohaiphong.vn/upload/files/deperob.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/cv9VXjIrmdE/uplcv?utm_term=geometry+dash+latest+version+apkPDF link annotation
    • https://mediacentre.aerlingus.com/js/ckfinder/userfiles/files/99861512960.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_off0000d9e1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E1 10968 bytes
SHA-256: a498e71473877a89735bcbe8b7764822d3538f7c7bef7adf107b9ad042b24f65
font_01_sfnt_off0000f334.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF334 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b46.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B46 19004 bytes
SHA-256: 9e99e0bbd9442dfdae41f1e77ad4deb016726e46e73e23136456e569b59ee2f9