Malicious PDF — malware analysis report

Static analysis result for SHA-256 bccabfbe50f981cc…

MALICIOUS

PDF

69.3 KB Created: 2021-09-29 03:57:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 78329350a1ffdef7d1d30297cbee808e SHA-1: 3db1724aa4b770aac5519f70861677aef75c8f92 SHA-256: bccabfbe50f981cc4b5905e5c4e462ca62943bdf34e8d7c9f21796af11cffea1
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, with one heuristic specifically identifying it as a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for exploiting PDF vulnerabilities or redirecting users.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9916

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 http://secureyun.cn/uploadfile/file///2021090803105299.pdf In PDF document text
    • https://adverto.ee/userfiles/file/10926232664.pdfIn PDF document text
    • http://bona-agra.pl/Upload/file/mijesosorufukatul.pdfIn PDF document text
    • https://willmarareachamber.com/ckfinder/userfiles/files/wijipubojowixexitidito.pdfIn PDF document text
    • https://blsautomation.com/ckfinder/userfiles/files/lafopanifugasovawanokojid.pdfIn PDF document text
    • https://wmu24.ru/media/file/21252023354.pdfIn PDF document text
    • http://cityyeast.com/userfiles/file/tovejij.pdfIn PDF document text
    • http://dailymaytrogiang.com/userfiles/files/xevomiroraluzaluwusi.pdfIn PDF document text
    • http://kristiankutschera.de/userfiles/file/jikugulutuxujebi.pdfIn PDF document text
    • http://aiswaryamatrimonials.com/fck_uploads/file/kekujufojudigumiban.pdfIn PDF document text
    • http://hsi-international.com/ckfinder/userfiles/files/pisolol.pdfIn PDF document text
    • http://www.acefence.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140090bf1a53---24291840994.pdfIn PDF document text
    • http://www.phsdcenter.com/temp/js/ckfinder/userfiles/files/vokomewufojagonuraje.pdfIn PDF document text
    • https://chasehr.in/userfiles/file/91521666623.pdfIn PDF document text
    • http://togclick.com/media/userFckfiles/file/nitasugibujibumeli.pdfIn PDF document text
    • http://dok-vo.ru/userfiles/file/74736761284.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/38119219942.pdfIn PDF document text
    • http://dintainoodle.com/uploads/files/88756021719.pdfIn PDF document text
    • https://mar3ol.com/Files/files/vudemewopozupizidub.pdfIn PDF document text
    • http://gocep.org/data/userfiles/files/16234756715.pdfIn PDF document text
    • https://www.tifdip.com/wp-content/plugins/formcraft/file-upload/server/content/files/16144d13ce3691---62287387820.pdfIn PDF document text
    • http://eschool365.in/js/admin/uploadfiles/file/mirodo.pdfIn PDF document text
    • https://xn--80aaa1arbfjoe3bzh.xn--p1ai/data/files/wadelijuperodujekudut.pdfIn PDF document text
    • https://jesssmithtri.com/jesssmith/ckfinder/userfiles/files/sukeza.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/BvfzZFkJO3s/uplcv?utm_term=camscanner+premium+versionPDF 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://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_off0000afe7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFE7 16488 bytes
SHA-256: 1658bd760038127c7ca2ca73da592597736f66f00be1f065c05490d63b38ae0c
font_01_sfnt_off0000d9c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9C7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f1de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1DE 10588 bytes
SHA-256: 4bec7c0115ea315c49091782f4b4b396e618ee1b557eb1772519cc8dd4dd61b7

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