Malicious PDF — malware analysis report

Static analysis result for SHA-256 87d6f12e315e527c…

MALICIOUS

PDF

84.0 KB Created: 2021-09-15 15:12:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 4a4cf039ff8bc83eda6560944fbcc138 SHA-1: cdc17c51eb92682fbc26d61fa122e4b74f4cbd24 SHA-256: 87d6f12e315e527c4aa9f55fc023b12bbc1e209a94670aaa85673f63b29ab157
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm, indicating a potential phishing or malware distribution scheme. The ML classifier and ClamAV detection strongly suggest malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded links are indicative of malicious activity, likely aiming to redirect users to compromised or malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

Heuristics 5

  • 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.
  • 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://sashtraayurveda.com/ckfinder/userfiles/files/52636951617.pdf In PDF document text
    • http://www.fullertherapy.com/wp-content/plugins/formcraft/file-upload/server/content/files/161363b6a97b58---87626060832.pdfIn PDF document text
    • https://vkgnassociates.com/dayafter/uploadimages/newsimages/file/83549883831.pdfIn PDF document text
    • https://jobtiara.com/files/files/93736348165.pdfIn PDF document text
    • https://lifecareproduct.in/ckfinder/userfiles/files/falozujijanawixunubi.pdfIn PDF document text
    • https://farsiherbal.com/cache/fck_files/file/mofelepunobopowasowoxiz.pdfIn PDF document text
    • http://xinchenfast.com/upload/file/kiguxosemena.pdfIn PDF document text
    • http://fosterfreezesantarosa.com/uploads/files/gatomusulenizobujekedowi.pdfIn PDF document text
    • https://gaziemirkentkonseyi.com/upload/files/rudemuduxiwowuxeroxesuzow.pdfIn PDF document text
    • http://sonnenheizungen.ch/fckeditor/editor/images/file/luzoseganuwuvorotugumur.pdfIn PDF document text
    • http://mfcwestenkwartier.nl/beta/userfiles/file/xiwotibiguworugizoxu.pdfIn PDF document text
    • https://www.sistemkabin.com/ckfinder/userfiles/files/zutubiwix.pdfIn PDF document text
    • http://vitalenzyme.com/uploads/fckupload/file/tulabeg.pdfIn PDF document text
    • https://bhiringisamsankalimandir.org/userfiles/file/96034113827.pdfIn PDF document text
    • http://gzafjc.com/uploadfile/files/vazepenuxuge.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/fujiritapifipagafu.pdfIn PDF document text
    • http://gibisch.biz/files/files/92405584376.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/40148246434.pdfIn PDF document text
    • http://romento.com/uploaded_files/userfiles/files/68398073147.pdfIn PDF document text
    • http://kocavietnam.com/upload/files/xasomibuxaxisevubawululag.pdfIn PDF document text
    • http://veterinariacomportamentale.it/userfiles/files/26648837748.pdfIn PDF document text
    • http://asbufestival.com/uploads/FCK_files/file/62014195961.pdfIn PDF document text
    • https://liur-krd.ru/userfiles/file/dinujagekejanivonotes.pdfIn PDF document text
    • https://www.bevillelecomte.ovh/ckfinder/userfiles/files/pegazemulukazedomuberukin.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/LPIa9PGmDLg/uplcv?utm_term=cult+movie+streaming+servicePDF 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_off0000e33a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE33A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb51.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB51 10768 bytes
SHA-256: abf2d1193e07e640d39bd7391a5a04a28a6e25878bb7efefee965941095ca3ff
font_02_sfnt_off0001142b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1142B 17800 bytes
SHA-256: d5f53ba722cb15aee2875950d3a54f191899f1144757109d33c05246dd816534