Malicious PDF — malware analysis report

Static analysis result for SHA-256 ae07217e56ff6ae5…

MALICIOUS

PDF

68.9 KB Created: 2021-09-26 07:16:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 3b5b24acb2b7d812ed699a4e0175fc92 SHA-1: b63bc95d3ea22211cfab49c84a160c45878dc039 SHA-256: ae07217e56ff6ae5a02eac44925acb6bb7f40e9f40c8183111a33114b2771299
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to disposable domains, indicating a link farm designed to redirect users. The ClamAV detection and ML classifier strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or initiating malicious actions.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

Heuristics 6

  • 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.
  • 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 http://zubrcup.by/files/files/20659437098.pdf In PDF document text
    • http://jsqnchem.com/upload/files/3882081126.pdfIn PDF document text
    • http://congtyvima.com/images/Download/9870513671.pdfIn PDF document text
    • http://diegogenna.it/userfiles/files/xifixetuduliwexajodu.pdfIn PDF document text
    • http://zentrumok.com/userfile/files/15706084061.pdfIn PDF document text
    • http://alacarte-grafik.de/userfiles/file/sisilezuvonugogudufagasow.pdfIn PDF document text
    • http://infrabud.eu/fckpliki/file/rizimosugawenewagomatupu.pdfIn PDF document text
    • http://skyrun-arser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905055543732738dfxkvf.pdfIn PDF document text
    • http://xn--b1amishc2fb.xn--p1ai/ckfinder/userfiles/files/dumepalataz.pdfIn PDF document text
    • http://saigonradio.com/userfiles/file/41572213386.pdfIn PDF document text
    • http://www.holderit.com/wp-content/plugins/formcraft/file-upload/server/content/files/1612ed344d370c---bepupiwaxugedoj.pdfIn PDF document text
    • https://ajambary.com/userfiles/file/7395663797.pdfIn PDF document text
    • https://telechips.com/ckfinder/userfiles/files/xalujaforejumewuka.pdfIn PDF document text
    • http://quaretti.it/userfiles/files/53963241545.pdfIn PDF document text
    • http://maketmaster.ru/admin/ckfinder/userfiles/files/78062658933.pdfIn PDF document text
    • http://vititanon.com/user_img/files/bolufukewasaxonimo.pdfIn PDF document text
    • https://ashleymongolia.mn/uploads/files/laxoki.pdfIn PDF document text
    • https://tonwen.org/userfiles/file/79073330439.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/wuxogo.pdfIn PDF document text
    • https://paardenwelzijnscheck.nl/app/webroot/files/ckeditor_files/files/38488446077.pdfIn PDF document text
    • http://chinalanpa.com/images/upload/File/38530884452.pdfIn PDF document text
    • http://www.a-fairys-choice.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ac78b92831---28192426719.pdfIn PDF document text
    • http://dzirerealtors.com/uploads/bagumoxegegif.pdfIn PDF document text
    • http://xn--80affcyoc0ac1f6a.xn--p1ai/admin/modules/ckeditor/ckfinder/userfiles/files/lovekerunu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=street+fighter+v+game+download+apkPDF link annotation
    • 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_off0000afae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFAE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7c0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7C0 14608 bytes
SHA-256: 729b424ba8f0a75e6c141f0479889d064c20baf6f5e50ca4f01ca61c0430d3d1
font_02_sfnt_off0000ec41.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC41 11096 bytes
SHA-256: 1ff07115bf6f6bc9d17cd3f88659f0fdb9f36b35c89ca3ec05deafe195a50e7b