Malicious PDF — malware analysis report

Static analysis result for SHA-256 ba134d08be297bf9…

MALICIOUS

PDF

83.4 KB Created: 2021-09-19 11:14:57 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 7d0339986d20d751bb3edfdeaf652442 SHA-1: eaa49a560aa41629d5f9b32b03ae405868686ba1 SHA-256: ba134d08be297bf9565a6c70694cb29bd0bd3aa22279ecc1984b40284e50afa2
134 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a malicious intent. The ML classifier and ClamAV detection strongly suggest this is a phishing or trojan delivery mechanism. The embedded JavaScript likely facilitates the redirection to malicious URLs.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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://irlanc.ru/uplcv?utm_term=coffee+and+vanilla+ep+1 PDF link annotation
    • http://kingspec.su/wp-content/plugins/super-forms/uploads/php/files/v3sijihc855flqqoavq69kl3u2/ralopijakoguwapinususot.pdfIn PDF document text
    • https://carcarnet.com/home/sandbox/domains/hkdance.tritek.hk/public_html/ckfinder/userfiles/files/resexitupewi.pdfIn PDF document text
    • http://fanghsin.com/uploads/files/202109011211075299.pdfIn PDF document text
    • http://vaynhe.com/upload/files/45132742691.pdfIn PDF document text
    • https://bevasilicones.in/userfiles/file/foguseramujifaral.pdfIn PDF document text
    • https://himalayanespresso.com/espresso_ckfinder/userfiles/files/70059969531.pdfIn PDF document text
    • https://bhavanarayanaswamy.org/userfiles/file/42820767463.pdfIn PDF document text
    • https://dpt-mh.com/uploads/news/files/75863106802.pdfIn PDF document text
    • http://buffagiuseppeinfissi.com/userfiles/files/21979663915.pdfIn PDF document text
    • http://anhbanglaw.com/userfiles/file/lisute.pdfIn PDF document text
    • http://e-park.es/img/uploads/files/taxujobiju.pdfIn PDF document text
    • https://www.hemingway.bg/app/templates/js/ckfinder/userfiles/files/25314186601.pdfIn PDF document text
    • http://ganan10.co.il/wp-content/plugins/formcraft/file-upload/server/content/files/1613776574d9f4---28354772823.pdfIn PDF document text
    • http://insuralead.com/userfiles/file/6626757428.pdfIn PDF document text
    • http://l-max.ru/userfiles/file/ranemudidivage.pdfIn PDF document text
    • http://ecohost.ru/pics/images/file/87152401722.pdfIn PDF document text
    • http://atsrealtyvietnam.com/upload/files/mufivivasolomumugozuda.pdfIn PDF document text
    • http://baugeraeteverleih.de/benutzerdateien/22314216555.pdfIn PDF document text
    • http://myhomeinparis.com/userfiles/files/88127084166.pdfIn PDF document text
    • http://quincy.pl/ckfinder/userfiles/files/zolapakiwuged.pdfIn PDF document text
    • https://diamond-marketing.cz/soubory/57002650980.pdfIn PDF document text
    • https://lapdonline.org/file/44679188544.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_off0000e2d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2D4 17596 bytes
SHA-256: 88a56d9bf94a08c4f75ebfb78fc4c4fb8cad0d5de3ecba20748c33b0ee577b7b
font_01_sfnt_off000110b4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x110B4 10276 bytes
SHA-256: 7be9016b4c838dfe34ff66d36ba7e37aef672133cfdafdee52c825dc2963578f
font_02_sfnt_off000127fb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127FB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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