Malicious PDF — malware analysis report

Static analysis result for SHA-256 ed9058d9dd9aa354…

MALICIOUS

PDF

84.9 KB Created: 2021-09-09 07:44:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e1576ecd35bf56a98e9c3ce3826424b1 SHA-1: c95d9029c33d7e26e725e4ad08f13a9a63864945 SHA-256: ed9058d9dd9aa354a9fa137d3f1ead070dcbd08c3694de3d1532f896fe53fe02
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, with heuristics indicating embedded JavaScript and a link farm structure. The presence of numerous external URIs, many pointing to PDFs on disposable hosting, suggests an attempt to distribute malicious content or phish users. The embedded JavaScript likely facilitates the execution of malicious actions or the download of further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9905

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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.
  • 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 https://parklanehotel.asia/userfiles/file/96717118938.pdf In PDF document text
    • http://www.pattyn360.com/upload/forum/files/jubujobebugedisupe.pdfIn PDF document text
    • http://progettocecinacuore.it/writable/public/userfiles/file/83475025257.pdfIn PDF document text
    • http://vlajkylevne.cz/UserFiles/File/61112775471.pdfIn PDF document text
    • http://www.thelawchamber.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132225287084---kavusolamal.pdfIn PDF document text
    • https://supermagnum-bg.com/ckfinder/userfiles/files/74136734295.pdfIn PDF document text
    • http://sriagasthiyarastro.com/FCKeditor/userfiles/file/balubut.pdfIn PDF document text
    • http://bjyhyy.cn/filespath/files/20210908200405.pdfIn PDF document text
    • http://ivelinabozilova.com/userfiles/file/10254249598.pdfIn PDF document text
    • http://timnhanhonline.com/upload/files/fipasaxupumuropeboxibox.pdfIn PDF document text
    • http://medrea.ru/upload/files/puligoxet.pdfIn PDF document text
    • http://moretonassets.net/userfiles/55322732451.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/ferebov.pdfIn PDF document text
    • http://interreg-ipa-husrb.com/downloads/pirututolijitijudelopepan.pdfIn PDF document text
    • http://stjconsulting.it/userfiles/files/pulivenutupulajapo.pdfIn PDF document text
    • http://carshopm.com/js/upload/files/wimozi.pdfIn PDF document text
    • http://kenhuffbuilders.com/userfiles/file/43982933212.pdfIn PDF document text
    • http://rafaelstore.ru/upload/files/sipod.pdfIn PDF document text
    • https://polymadeniyaglar.com/fckeditor/userfiles/file/vesazubot.pdfIn PDF document text
    • http://consol.hu/images/uploadedimages/file/81810738179.pdfIn PDF document text
    • http://officeharbor.com/pdtInfo/kirexabirofamevuzajekil.pdfIn PDF document text
    • http://klhl.com/userfiles/file/xuxumudapewo.pdfIn PDF document text
    • http://lignumweb.com/site/webroot/uploads/files/zivilukonopapilamo.pdfIn PDF document text
    • https://skillmapmagazine.com/ckfinder/userfiles/files/tonulu.pdfIn PDF document text
    • http://wakesup.org/userfiles/file/26843246320.pdfIn PDF document text
    • http://pjteam.hu/uploads/netewogagu.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/20219931036299.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1KS0DP0cxss/uplcv?utm_term=can+i+download+mobdro+on+my+smart+tvPDF 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_off0000e3f7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3F7 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc0e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC0E 10712 bytes
SHA-256: 49d3b7eb86108e147add67365d5dfeec53247c820ae9dcb350248a15caeecf61
font_02_sfnt_off000114ae.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x114AE 18848 bytes
SHA-256: c720e4cf8c30573ff1f32a290ab60a0fe65bde6cb886cb3ce15d06a525eb74e0