Malicious PDF — malware analysis report

Static analysis result for SHA-256 53e0f7d9f1dd9194…

MALICIOUS

PDF

86.7 KB Created: 2021-09-16 14:19:33 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: fa4913ef737098a9d5ef4e2f1ac65777 SHA-1: 41c9eeb629e44e61091f724e12789aa5c6282d96 SHA-256: 53e0f7d9f1dd9194f8c901ce91d57699d4339bc348998ad1c429232654e23d83
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous embedded URLs and a heuristic firing for a 'download button' lure, indicating a phishing or social engineering attempt. ClamAV detection as 'Pdf.Phishing.Trojan' and ML classification further support its malicious nature. The presence of many distinct, potentially disposable domains used for linking suggests a link farm designed to obscure the ultimate destination or host multiple payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://xn--sanitrprofi-p8a.ch/fckeditor/editor/images/file/51581459116.pdf In PDF document text
    • http://inkjetartandimage.com/Uploads/file/73063940503.pdfIn PDF document text
    • http://olympiad-bigben.ru/ckfinder/userfiles/files/davifimonakagumitelobegux.pdfIn PDF document text
    • http://shiokuda1.com/contents/files/wogujomimobuvewuravusimew.pdfIn PDF document text
    • https://arrayamed.com/userfiles/file/9737693558.pdfIn PDF document text
    • http://commune-bourre.com/userfiles/file/runuwatunoj.pdfIn PDF document text
    • https://7foro.exceltur.org/exceltur_nuevo/ckfinder/userfiles/files/jinefamowijazegadetenuz.pdfIn PDF document text
    • http://webspace.mysdam.net/images/newsletter/files/89509288452.pdfIn PDF document text
    • http://etalentlink.com/uploadfile/file///2021090417201693.pdfIn PDF document text
    • http://8njl.com/userfiles/files/wogodapasibumidizumixa.pdfIn PDF document text
    • https://brs.jo/userfiles/files/demorasuwavafiwen.pdfIn PDF document text
    • https://bliznacite.dvsportbg.com/files/81016164477.pdfIn PDF document text
    • http://www.barankayalar.com.tr/wp-content/plugins/formcraft/file-upload/server/content/files/16141fe44be0ae---wusebepopiru.pdfIn PDF document text
    • https://xn--fct8ml6mwue.tw/uploads/files/fuvevamesenokesawonevub.pdfIn PDF document text
    • https://laplacedesstores.com/upload/file/61985981182.pdfIn PDF document text
    • https://voolabs.com/wp-content/plugins/formcraft/file-upload/server/content/files/161315ab88f4f4---dewivodedor.pdfIn PDF document text
    • http://ibconsulting.it/userfiles/files/lorunadotarare.pdfIn PDF document text
    • http://photonart.nl/phpcmsys/file/vuxepebav.pdfIn PDF document text
    • https://zhbiotech.com/CKEdit/upload/files/96631386043.pdfIn PDF document text
    • https://playerpress.com/ckfinder/userfiles/files/vidonorutubudo.pdfIn PDF document text
    • http://grandp.ru/userfiles/file/tajotipizonebafu.pdfIn PDF document text
    • https://hotelcorona.ro/files/fomofifezawopulopoba.pdfIn PDF document text
    • https://apotekatia.ba/fajlovi/79260823858.pdfIn PDF document text
    • https://kapokcmassage.com/uploads/files/202109072128082723.pdfIn PDF document text
    • https://alasclub.gr/neuro/ckfinder/userfiles/files/bujapakog.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3CAf4wW3hvY/uplcv?utm_term=download+apk+vidmate+old+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://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_off0000e9f2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9F2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off00010209.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10209 10800 bytes
SHA-256: f64e793cf2e51ce884e2ce94ba00f4227da3c468283241f36112f4df908dfc63
font_02_sfnt_off00011af2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AF2 19316 bytes
SHA-256: c45728cf65fa7b90da090cd13727ee305104ad9ff70ad0c4d1dd3913b97d493a