Malicious PDF — malware analysis report

Static analysis result for SHA-256 fd42f2566fe7606f…

MALICIOUS

PDF

85.0 KB Created: 2021-09-12 06:38:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 3e8fa610cbffd6497aa4f448ba5abf90 SHA-1: d5929f8dbcfb1045cae419acea4333f1e0be945a SHA-256: fd42f2566fe7606ffbcce79ef5e81f668bc4d024e1f72cc528bc46e3123a28fe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains. 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 to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://irlanc.ru/uplcv?utm_term=php+for+android+apps PDF link annotation
    • https://premiersuli.hu/files/files/2547558980.pdfIn PDF document text
    • https://mytshirtcreator.com/app/webroot/files/file/51086933034.pdfIn PDF document text
    • https://optimuselearningschool.aels.edu/learning/site/images/uploadfiles/52919956795.pdfIn PDF document text
    • http://glampingcaravan.com/userfiles/file/20210911163458.pdfIn PDF document text
    • http://walosports.cl/userfiles/file/5737614807.pdfIn PDF document text
    • https://yoimart.com/upload/file/20210907135344.pdfIn PDF document text
    • http://perechen-jurnalov.ru/js/ckfinder/userfiles/files/46689364732.pdfIn PDF document text
    • https://csn-alliance.com/data/files/71043368560.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/kamuv.pdfIn PDF document text
    • http://www.advancedevents.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613b315aa908b---votavigitumasanajum.pdfIn PDF document text
    • https://highendteen.com/userfiles/files/wibikamenuboxululogakob.pdfIn PDF document text
    • https://anandamsanyal.com/userfiles/file/95670231494.pdfIn PDF document text
    • http://www.smpnuenen.nl/images/files/2745029746.pdfIn PDF document text
    • http://33podarka.ru/pictures/files/subawunadil.pdfIn PDF document text
    • http://fskyok.com/uploadfile/files/99167072865.pdfIn PDF document text
    • http://etre-belle.su/images/file/45822623058.pdfIn PDF document text
    • https://nmcs.ca/userfiles/files/javokajixopug.pdfIn PDF document text
    • http://healhumanity.foundation/userfiles/file/dexagepa.pdfIn PDF document text
    • https://gamletaarnhuset.no/wp-content/plugins/formcraft/file-upload/server/content/files/161357a409d5d7---85529344415.pdfIn PDF document text
    • http://vaness-sens.fr/ckfinder/userfiles/files/82251941008.pdfIn PDF document text
    • http://laclonghotel.vn/upload/files/29685012033.pdfIn PDF document text
    • http://meadescafe.com/userfiles/file/kipivamow.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/towetizejosabaviwozi.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_off0000e85d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE85D 10320 bytes
SHA-256: 542b1ca0866bf8c127681237c1327f77ad452dff16aafc1bb1505a750a458471
font_01_sfnt_off0000ff77.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF77 18056 bytes
SHA-256: d9828d8cbf2307a43df9fc6d092378ba4575da25f571fdbcac48120351a7f475
font_02_sfnt_off00012e5d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E5D 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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