Malicious PDF — malware analysis report

Static analysis result for SHA-256 463177cf76a0e091…

MALICIOUS

PDF

85.6 KB Created: 2021-09-15 15:09:30 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 386961fd7caf62146892dcb2d8a29508 SHA-1: a8bfe22690fc8ff465eed9e3dcdd07c326006f2d SHA-256: 463177cf76a0e091f6e4e48e9b4eef2b275c7d63374db626840516d3b92f8331
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a heuristic firing for a link farm on disposable hosting, indicating a malicious intent to redirect users. The ML classifier and ClamAV detection strongly support this assessment. The embedded JavaScript likely facilitates the redirection to external URLs, which are numerous and varied, suggesting a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://halkapsikoloji.net/userfiles/file/58649507867.pdf In PDF document text
    • http://studiobaliva.eu/userfiles/files/vurixabafij.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/mivovujolo.pdfIn PDF document text
    • https://xn--p3t29jo1ed4o4xw.tw/upload/files/85762052582.pdfIn PDF document text
    • https://reviewz.eu/app/webroot/files/userfiles/files/namofulobawinaf.pdfIn PDF document text
    • http://merrygoldholidays.com/ckfinder/userfiles/files/10027424564.pdfIn PDF document text
    • https://nmg.lv/img/uploads/files/sewiwipisinexijof.pdfIn PDF document text
    • http://phutunggiahungoto.com/uploads/files/57139847408.pdfIn PDF document text
    • http://studio-castiglioni.com/userfiles/files/23614557622.pdfIn PDF document text
    • https://adsbudget.net/userfiles/file/sulezoponafunifopodag.pdfIn PDF document text
    • http://xn--80ackbssfuieecff0e8c.xn--p1ai/wp-content/plugins/super-forms/uploads/php/files/ml35414o0c8mfqfq6pq3nd7ko2/95997140631.pdfIn PDF document text
    • http://lorofilmes.com/Uploads/ckfinder/userfiles/files/40718046375.pdfIn PDF document text
    • https://eduinfinite.com/wp-content/plugins/super-forms/uploads/php/files/f19e7968eea96e35d4cbdadfd6e4ac28/vopulanujakaromobasarugi.pdfIn PDF document text
    • https://mertlakustika.cz/images/pages/file/nigebamogijametudig.pdfIn PDF document text
    • http://dywin.com/uploadfile/files/86169604482.pdfIn PDF document text
    • http://www.coverseg.com/uploads/ckfinder/files/11495670840.pdfIn PDF document text
    • http://express-service-auto.fr/ckeditor/ckfinder/userfiles/files/78999399284.pdfIn PDF document text
    • http://drzwiukryte.pl/userfiles/file/gidoturudizoxemiwi.pdfIn PDF document text
    • https://apaman.ti-am.jp/js/ckfinder/userfiles/files/10884117216.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/91901033124.pdfIn PDF document text
    • https://venefoil.com/ckfinder/userfiles/files/15191630247.pdfIn PDF document text
    • https://netkat.in/ckfinder/userfiles/files/67353385085.pdfIn PDF document text
    • http://stylekd.ru/files/saviwezidusavonap.pdfIn PDF document text
    • http://pamatudarbai.lt/ckfinder/userfiles/files/lulonesizekiwadux.pdfIn PDF document text
    • https://karlschool.org/uploads/files/202109082036097888.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+find+out+phone+numberPDF 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_off0000eac3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAC3 17620 bytes
SHA-256: b0d3d825475497f6ce9009941e36666b79f1139b0a3bb324fb03befc1babf400
font_01_sfnt_off000118d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x118D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000130eb.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x130EB 10608 bytes
SHA-256: 18c96ff8ddfc119c44aa084d5523d5cbb33ab78117ee49dd751ff3103c1c18c4