Malicious PDF — malware analysis report

Static analysis result for SHA-256 1b347ac2556996dd…

MALICIOUS

PDF

75.4 KB Created: 2021-09-08 17:08:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 96d72b059a39a61fa2531c4d2ed35a51 SHA-1: cbc751d74c407c650ae4cb3820b84ca62da3d417 SHA-256: 1b347ac2556996dd9c9a08a69f54185c935e9daaa57cd80d20e669a9474dc137
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and a high number of external URIs, many of which are part of a link farm on disposable hosting. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware via the numerous embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://queure.ru/uplcv?utm_term=dewalt+table+saw+dw745+manual PDF link annotation
    • http://www.larucheapain.fr/ljk/file/45517903624.pdfIn PDF document text
    • http://geometracosentino.com/userfiles/files/9415697954.pdfIn PDF document text
    • http://j-line.ca/fck_upload/file/88684649472.pdfIn PDF document text
    • http://risorsaterra.it/userfiles/files/97225505125.pdfIn PDF document text
    • http://viorina-deko.com/images/file/81950679078.pdfIn PDF document text
    • http://bidadapatidar.com/userfiles/file/86027424764.pdfIn PDF document text
    • https://dakotaterritorydevelopment.com/ckfinder/userfiles/files/55874060119.pdfIn PDF document text
    • http://wib24-admin.de/uploads/file/43905095892.pdfIn PDF document text
    • https://bakotech.at/uploads/ckeditor/files/vaguzasimu.pdfIn PDF document text
    • https://taiwan-tiaya.com/upload/tiaya_official/files/rivevasolezetegel.pdfIn PDF document text
    • http://antik-cafe-bergen.de/wp-content/plugins/formcraft/file-upload/server/content/files/161345c427124f---56796026290.pdfIn PDF document text
    • http://gruppocreta.com/userfiles/files/muzuvilulu.pdfIn PDF document text
    • http://autosoftware.company/autoresponders_images/files/75693080212.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/13923556625.pdfIn PDF document text
    • http://arserwood.com/js/fckeditor/editor/filemanager/connectors/php/connector.php/upfiles/file/210905012255101279dg8fw4.pdfIn PDF document text
    • http://hockjoohin.com/admin/uploads/file/27545832756.pdfIn PDF document text
    • https://jlgardner.org/home/jlg/public_html/ckfinder/userfiles/files/60398145595.pdfIn PDF document text
    • http://yourtruck.be/upload/ckeditor/file/86883703376.pdfIn PDF document text
    • http://yourbuilding.ru/userfiles/files/19838477456.pdfIn PDF document text
    • https://bnbtravels.com/ckfinder/userfiles/files/jikerax.pdfIn PDF document text
    • http://pro-group.ru/userfiles/file/tolusapegejumolubata.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/sixijajudibal.pdfIn PDF document text
    • http://rideabikenews.com/user_img/files/worijakanupifosapa.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_off0000c15e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC15E 10684 bytes
SHA-256: ad0447f6fc2176842787b77705b053422c49ae04cea2e74449fa092072a07498
font_01_sfnt_off0000da13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA13 17680 bytes
SHA-256: cae70d1ae35d902435f6544140b0da0f3b542042b9ed4ef384dae8f28dfc65e0
font_02_sfnt_off000107de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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