Malicious PDF — malware analysis report

Static analysis result for SHA-256 a6026a4dd6cd5e20…

MALICIOUS

PDF

79.5 KB Created: 2021-09-10 16:04:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-02
MD5: 02d9c04b0f1930643ea8cfad989a576c SHA-1: dc050a87280cce81ac5d7f233c3a393687eae4d1 SHA-256: a6026a4dd6cd5e20777d9ffdb5512d56dad116cf891c10fa5bc8bb07a113e7a7
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document was flagged as malicious by ClamAV and an ML classifier. The file embeds a large number of external links characteristic of an SEO link farm, presents a deceptive download button and contains embedded JavaScript. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9917

Heuristics 7

  • 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.
  • 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://pixomot.ru/uplcv?utm_term=frp+bypass+apk+easy PDF link annotation
    • http://sys-svinding.dk/userfiles/file/pawugogupumepexesizepolu.pdfIn PDF document text
    • http://hai-bi.com/uploads/files/202109051314291412.pdfIn PDF document text
    • http://topimmigrationlawyer.org/ckfinder/userfiles/files/1304345035.pdfIn PDF document text
    • https://iringmalaysia.com/ckfinder/userfiles/files/xazajobabi.pdfIn PDF document text
    • http://supair-lux.hu/ckfinder/userfiles/files/taxawusokiv.pdfIn PDF document text
    • https://rallstarawards.us/nbloom/fckuploads/file/50621142069.pdfIn PDF document text
    • https://guclupin.com/calisma2/files/uploads/76475580822.pdfIn PDF document text
    • https://kfk-dekoration.dk/images/uploadedimages/file/83006784695.pdfIn PDF document text
    • http://floral-design-lindgens.de/userfiles/file/20050266433.pdfIn PDF document text
    • https://birsamundapark.in/userfiles/files/fefirut.pdfIn PDF document text
    • http://leaders-adv.net/userfiles/file/sulovoboxojawin.pdfIn PDF document text
    • http://www.adanakursmerkezi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16130b0f7b9b51---nazuliwanugorilofolewara.pdfIn PDF document text
    • https://korzo-galeria.hu/files/file/54680851378.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/6867268822.pdfIn PDF document text
    • http://graylegalservices.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/36259790920.pdfIn PDF document text
    • http://songhandiban.com/uploadfile/file/2021091020132873499.pdfIn PDF document text
    • http://tovicetour.com/FileData/ckfinder/files/20210903_F35358DA167DD5FA.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/68092626219.pdfIn PDF document text
    • http://cps-mbstu.edu.bd/app/webroot/js/ckfinder/userfiles/files/43979849474.pdfIn PDF document text
    • http://togul.org/sites/default/files/file/44243255063.pdfIn PDF document text
    • http://www.kissdocs.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/16130448d6e24f---nikilovarigi.pdfIn PDF document text
    • http://botosani.ro/img/uploads/file/doboxagozalerunexibize.pdfIn PDF document text
    • http://chornakorn-packing.com/ckfinder/userfiles/files/barunisuro.pdfIn PDF document text
    • http://nextlab-semi.com/files/fckeditor/file/97688994910.pdfIn PDF document text
    • http://ilturismoinitalia.it/userfiles/files/3985722310.pdfIn PDF document text
    • http://kripasec.com/userfiles/file/22744419174.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_off0000d15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD15E 10108 bytes
SHA-256: dcc460e163786aceba7f93575eaa77fa84ea7e5d22220039a7d104c3b64978c3
font_01_sfnt_off0000e7d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7D2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ffe4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFFE4 18396 bytes
SHA-256: 96ba4b83ce4af08785b17a8672eb47482ea003ba57e2c091a53e6bd3ae5fefc7