Malicious PDF — malware analysis report

Static analysis result for SHA-256 5a1f5725b9ceec0c…

MALICIOUS

PDF

81.0 KB Created: 2021-09-13 10:25:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: f68b66f9a282105b8492fb19bf3623b5 SHA-1: c704cca349e137b2f979c5f56342adb4fddeb9d2 SHA-256: 5a1f5725b9ceec0c0da6724c3add034ab01421b79bc71a50a5e147bc21b676d4
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample contains embedded JavaScript, a common technique for executing malicious code within PDFs. It also features numerous external URIs, including one pointing to 'laborke.ru', which are likely used to redirect the user to phishing sites or download further malicious payloads. The ML classifier and ClamAV detection strongly indicate malicious intent.

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://laborke.ru/uplcv?utm_term=shapes+class+5 PDF link annotation
    • http://bowlingkillers.com/imgdb/files/bimezamujijuwokopataponaz.pdfIn PDF document text
    • http://medical-1669.com/userfiles/files/kidokazezejetok.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/zobewusuzowowutu.pdfIn PDF document text
    • https://grahampropertytax.com/wp-content/plugins/super-forms/uploads/php/files/fa1ae552294d7bb8eaca52947f07fabb/5536321092.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/161394408daaf2---tevebiwaxiwidatafisap.pdfIn PDF document text
    • http://www.otevrenysklep.cz/ckfinder/userfiles/files/zosozelerakaja.pdfIn PDF document text
    • http://sowiik.pl/userfiles/file/92405026501.pdfIn PDF document text
    • http://skyrunarser.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210907171701901055oc0jzu.pdfIn PDF document text
    • http://ideatity.com/ckfinder/userfiles/files/zosebarukupasojozuv.pdfIn PDF document text
    • http://www.badischer-kunstverein.de/ckfinder/userfiles/files/81016244610.pdfIn PDF document text
    • https://optical-axis.com/uploads/files/202109120918408606.pdfIn PDF document text
    • http://longbeach.ilovepokebar.com/uploads/files/zomefopipogebimepej.pdfIn PDF document text
    • http://blueleaves.ru/userfiles/file/gizebupuvumorazodazu.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/03/file/42794897494.pdfIn PDF document text
    • http://aokisuper.com/ckfinder/userfiles/files/kenokixamefizusujiwimamo.pdfIn PDF document text
    • http://veewood.com/file_media/file_image/file/jimekusini.pdfIn PDF document text
    • https://horizontire.com/userfiles/file/55903170908.pdfIn PDF document text
    • https://ohligschlaeger-berger.de/wp-content/plugins/formcraft/file-upload/server/content/files/16134d42607432---mezumatado.pdfIn PDF document text
    • https://institutdesante.org/userfiles/file/zegutadege.pdfIn PDF document text
    • https://unifor975.ca/userfiles/file/28806803322.pdfIn PDF document text
    • https://swift-tw.com/lcc/upload/files/sulosumidifomijud.pdfIn PDF document text
    • http://www.workbythai.com/admin/assets/images/73987498405.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_off0000d9e2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD9E2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f1f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF1F9 10164 bytes
SHA-256: 63ca822dfad51e73561848aa568329441d007b2ba2fa500189690324a9e112ec
font_02_sfnt_off000108e9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x108E9 17764 bytes
SHA-256: 2ef307b2ea0db8b60d9062006db94b74e83f93a9898c51e24e9ff8c048512c6e

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