Malicious PDF — malware analysis report

Static analysis result for SHA-256 534e16b8ba66a254…

MALICIOUS

PDF

70.2 KB Created: 2021-09-28 04:46:51 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: f85076084b254b23306891fc9b8efaf0 SHA-1: 3a754ffa40e9fecb92f69093dd0204be7c07f3c1 SHA-256: 534e16b8ba66a2543be3392df04e23727cae0dfd4cfd568eac51b11422573e18
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, which is a common technique for executing malicious code. It also references numerous external URLs, suggesting a phishing or download lure. The ClamAV detection and ML classifier strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://philabc.ru/uplcv?utm_term=pirate+bay+mirror PDF link annotation
    • https://www.lang-mayer.de/wp-content/plugins/formcraft/file-upload/server/content/files/16152576d60532---30974100801.pdfIn PDF document text
    • http://starroadchina.com/userfiles/file/fobuxenek.pdfIn PDF document text
    • https://wegofa.com/userfiles/file/milideronifo.pdfIn PDF document text
    • https://cakenflowersonline.com/userfiles/file/fineke.pdfIn PDF document text
    • http://1000projects.ru/upload_picture/file/90887022316.pdfIn PDF document text
    • http://poltinka.ru/userfiles/file/45630066155.pdfIn PDF document text
    • https://nepalihemp.com/ckfinder/userfiles/files/gupikopikagukofeso.pdfIn PDF document text
    • http://isystemlab.com/admin/ckfinder/userfiles/files/muloxujuwiromogovek.pdfIn PDF document text
    • http://www.ktgroup.co.uk/ckfinder/userfiles/files/purametupesubivapupu.pdfIn PDF document text
    • http://cartopack.com/Images/file/73720671217.pdfIn PDF document text
    • http://aaaexpressac.com/userfiles/file/29160573645.pdfIn PDF document text
    • http://dalnoboy.net/data/filestorage/upload/files/85851609429.pdfIn PDF document text
    • http://sushiloverca.com/uploads/files/vikeruwitokavogatexi.pdfIn PDF document text
    • http://ipmarketing.net/FCKeditor/editor/filemanager/connectors/userfiles/file/34967036674.pdfIn PDF document text
    • http://alda.pl/ckfinder/userfiles/files/71318406930.pdfIn PDF document text
    • http://w3-japan.com/js/upload/files/21049150222.pdfIn PDF document text
    • https://amadesafar.ir/basefile/amadesafarir/files/ralulu.pdfIn PDF document text
    • http://plenaseguroseprevidencia.com/fotosempresa/files/80976208973.pdfIn PDF document text
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/j8m0b5d5ml3ke0p238ca7qlp2g/jopitimudoxolidoxuzejoku.pdfIn PDF document text
    • https://butyfarm.mm520.net/userfiles/files/60821663147.pdfIn PDF document text
    • https://cfaegaianascente.pt/portal/userfiles/files/sufam.pdfIn PDF document text
    • http://tuanayapim.com/rsm/files/lejokenixunidege.pdfIn PDF document text
    • http://xn----otbbfbbknchz.xn--p1ai/sadm_files/duvasumilo.pdfIn PDF document text
    • http://color-gateway.com/userfiles/file/19339406369.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_off0000b3ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB3CE 15796 bytes
SHA-256: 4b6835398dd4beb6bea2fab12c343a5a087a60f99d05e5e2fa6855baa7ef9d79
font_01_sfnt_off0000dc6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDC6B 10208 bytes
SHA-256: d82c22b5e6b26028c12bcea5b9f575b79672c474d3855271697efb5cd0638e22
font_02_sfnt_off0000f365.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF365 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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