Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8cf055ac4e86266…

MALICIOUS

PDF

73.6 KB Created: 2021-09-22 14:32:38 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 11a32f94429e042ffe3942534ec60103 SHA-1: 7e84c20e0035cdcc805021e402b61d7f26629b32 SHA-256: d8cf055ac4e8626665a051a1875fc63e07ae38ff4f262dabacdfb66bdefd31f4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating a phishing or redirection attempt. The ML classifier and ClamAV detection strongly suggest malicious intent, likely to lure users to malicious websites for further exploitation. The presence of JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://queure.ru/uplcv?utm_term=can+you+read+kindle+books+on+your+android+phone PDF link annotation
    • https://baxsporthorses.com/userfiles/file/16088539869.pdfIn PDF document text
    • https://narellesastro.com/userfiles/files/26622311396.pdfIn PDF document text
    • https://springkasteelhuren.be/userfiles/file/pimomonasenazum.pdfIn PDF document text
    • http://gulfcoastlist.com/userfiles/file/28300822735.pdfIn PDF document text
    • http://kondicionery-noginsk.ru/upload_picture/file/5236703058.pdfIn PDF document text
    • https://gameadvisers.com/js/new/fckeditor/userfiles/file/5135331194.pdfIn PDF document text
    • http://tdjl.com/uploadfile/file///2021090602232710.pdfIn PDF document text
    • https://airxps.com/userfiles/files/keroxepumuwapejikasu.pdfIn PDF document text
    • http://kimandyoo.com/userfiles/file/lupetofolireliwejibexot.pdfIn PDF document text
    • http://cu-hinothai.com/ckfinder/userfiles/files/jiladamawimulegir.pdfIn PDF document text
    • http://newkontakt.ru/userfiles/images/file/golunelovenesaxitipik.pdfIn PDF document text
    • http://gazosilikatnn.ru/uploads/files/69592831379.pdfIn PDF document text
    • https://nhahangbienhaitien.com/uploads/files/37996578628.pdfIn PDF document text
    • http://dnt-mayak.ru/content/File/roxitabup.pdfIn PDF document text
    • https://ariaparvaz.com/basefile/ariaparvazcom/files/rozutenutenujarogijesug.pdfIn PDF document text
    • http://villaturri.com/wp-content/plugins/formcraft/file-upload/server/content/files/16149451bca216---sokepisowanalalex.pdfIn PDF document text
    • http://espaciocultivarte.com/ckfinder/userfiles/files/40249829551.pdfIn PDF document text
    • http://sergeybazarov.ru/file/59651708996.pdfIn PDF document text
    • http://lunaleo.pl/userfiles/file/pevosixironewigekezuputo.pdfIn PDF document text
    • http://spodne-pradlo-2bpoint.sk/UserFiles/File/dinesetizipopatelizosa.pdfIn PDF document text
    • https://tiguan-wiki.ru/file/78217831831.pdfIn PDF document text
    • http://fratellilongoni.com/userfiles/files/puvaragugiluxi.pdfIn PDF document text
    • http://parzenica-bialka.pl/userfiles/files/67175940680.pdfIn PDF document text
    • http://www.uvhk.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614ae010c8dd2---sabojawiduwokusagog.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_off0000bb78.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBB78 10868 bytes
SHA-256: ed6a87985b59822e4e6c8bb25b6dc7e053fc83682b8cf94f7408375ec7410169
font_01_sfnt_off0000d445.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD445 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ec57.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC57 17004 bytes
SHA-256: fda52710f62940b161c568770995515c0662f21e9dbcb6b644144cc2777f0105

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