Malicious PDF — malware analysis report

Static analysis result for SHA-256 6fe24d742d19ba49…

MALICIOUS

PDF

69.3 KB Created: 2021-09-25 17:56:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5ed620344b6b43d044ff33c424ee74b1 SHA-1: bf193c14b6f2e0814d612f08a6c92d36012d06fa SHA-256: 6fe24d742d19ba49e18d30035178a857037382db73cf6b701ec1e8f317619c7d
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 of which are hosted on disposable domains. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates a deliberate attempt to create a link farm, suggesting a phishing or malware distribution campaign. The embedded JavaScript likely facilitates the redirection to these malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://krisoc.ru/uplcv?utm_term=android+procreate+apk PDF link annotation
    • http://cokhivietuc.webthoidai.com/img-vietuc/files/peteze.pdfIn PDF document text
    • https://ingatlansos.hu/images/userfiles/file/simigexad.pdfIn PDF document text
    • https://gabconstruction.com/ckfinder/userfiles/files/muvufu.pdfIn PDF document text
    • http://psn-monolit.ru/img_file/files/wiverutanizino.pdfIn PDF document text
    • https://budgetparking.ca/admin/uploads/file/vigenoruzegul.pdfIn PDF document text
    • http://bugskin.org/userfiles/file/38958246820.pdfIn PDF document text
    • http://thegrcinstitute.org/app/webroot/js/ckfinder/userfiles/files/57736493518.pdfIn PDF document text
    • https://vgk.tw/upfile/files/2021/09/21/vuzuwasutozugesowibokax.pdfIn PDF document text
    • http://dotbamboo.com/file_media/file_image/file/62975034571.pdfIn PDF document text
    • http://senseoftourism.dk/userfiles/file/poropuvizujaxijadep.pdfIn PDF document text
    • http://hattrick-sports.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614af00a717a1---leratikatotas.pdfIn PDF document text
    • https://harmony.im/userfiles/file/76617452861.pdfIn PDF document text
    • http://saraswatishikshamandir.com/singhania/downloads/file/7622159185.pdfIn PDF document text
    • http://kingsauto-bar.com/js/upload/files/58809283034.pdfIn PDF document text
    • http://giaydantuongphongngudep.com/images/news/file/ziwimewowenudotojokesu.pdfIn PDF document text
    • http://dealershop.es/camarasegovia/userfiles/file/87874489202.pdfIn PDF document text
    • http://tokstar.com/_UploadFile/Images/file/28720187125.pdfIn PDF document text
    • http://wwpokebar.com/uploads/files/lizomesonupowiwamitugiba.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/89220208668.pdfIn PDF document text
    • https://interstudy.net/userfiles/file/13666680613.pdfIn PDF document text
    • http://hpcad.pl/Upload/file/93084242583.pdfIn PDF document text
    • http://www.ecvbrass.ch/user/web/file/repikagitimerukiwo.pdfIn PDF document text
    • https://mangonebike.com/uploads/file/zupovajavadutuxobufa.pdfIn PDF document text
    • http://ei-windykacja.pl/upload/file/78885783395.pdfIn PDF document text
    • http://vo23.ru/upload/file/suduwakum.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_off0000af9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAF9E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7b5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7B5 10368 bytes
SHA-256: 22b36cd4560a8473b228d24099b8d2ec466438918c7dcc9669a69a841791d96a
font_02_sfnt_off0000df43.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF43 15928 bytes
SHA-256: e5cc16ed1a2e612c39cb5cf15eade9d4b2f767231473e379dcf232551c83bd74

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