Malicious PDF — malware analysis report

Static analysis result for SHA-256 bd0fd83241c5d308…

MALICIOUS

PDF

80.3 KB Created: 2021-09-11 15:54:17 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 326375290d6daba5093c2e26ef81245b SHA-1: 7a418778546113c26a37f4d1aa7c69c0580f09d6 SHA-256: bd0fd83241c5d308d493186ebae8e0282d6401897e6c5eb9c1f35ec2a12212dc
142 Risk Score

Malware Insights

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

The PDF contains embedded JavaScript and numerous external links, many of which are hosted on disposable domains and appear to be part of a link farm. The presence of a 'download button' heuristic further suggests a lure to download a malicious payload. ClamAV detection and ML classification strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://laborke.ru/uplcv?utm_term=android+scp+client PDF link annotation
    • http://aylabawadi.ae/userfiles/file/biwuginomifezesoda.pdfIn PDF document text
    • https://www.pirkitpadangas.lt/ckfinder/userfiles/files/81975473786.pdfIn PDF document text
    • http://longarmquiltacademy.net/fckeditor/userfiles/file/duvavugusarekotez.pdfIn PDF document text
    • https://greenways.at/userfiles/file/lovalojejukomawini.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/81527868803.pdfIn PDF document text
    • https://mr-alian.com/upload/ckfinder/files/bowuvaxuvulez.pdfIn PDF document text
    • https://qualitygums.com/userfiles/file/94893621868.pdfIn PDF document text
    • https://stealthwindow.tw/uploads/files/202109051423155370.pdfIn PDF document text
    • http://bjoybrands.com/wp-content/plugins/formcraft/file-upload/server/content/files/161394b0656b88---91856447550.pdfIn PDF document text
    • http://donaldnathanlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/53935073495.pdfIn PDF document text
    • http://kirilmazbardak.com/userfiles/file/bosajifixuzikonetiwozu.pdfIn PDF document text
    • https://iwistw.com/upload/files/serapudebe.pdfIn PDF document text
    • http://www.lebedosapartotel.com/data/yukle/files/wamubizofexemugavef.pdfIn PDF document text
    • http://isvpro.com/custom/files/zajajajavixitaniraxun.pdfIn PDF document text
    • http://nuuts.mn/uploads/assets/lekusuzojaxuz.pdfIn PDF document text
    • http://olympicthesportshop.in/uploads/kiwanorotexulena.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/37874774601.pdfIn PDF document text
    • http://kimyasaldubeller.com/upload/ckfinder/files/sawuzude.pdfIn PDF document text
    • http://tv-sat.cz/userfiles/file/vududawadukaxevatisuvase.pdfIn PDF document text
    • https://ntiverification.com/userfiles/file/lasikipologawelu.pdfIn PDF document text
    • https://birotex.rs/images/files/35808309051.pdfIn PDF document text
    • https://gift-edu.ru/wp-content/plugins/super-forms/uploads/php/files/8dcfb0b87e53f76ebe20b3ada36d60d6/9174127965.pdfIn PDF document text
    • http://behtarinekhodetbash.com/files/files/85361695624.pdfIn PDF document text
    • https://ensegun2.com/ckfinder/userfiles/files/13229358817.pdfIn PDF document text
    • http://kanoonkaraj.ir/dbmanager/filebank/htmlgallery/file///34367089808.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_off0000d564.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD564 10328 bytes
SHA-256: b0c4ad73d3574ed7644acdf50ff0a65b8efd647f2792f00b36b71c2e4dbf5a2d
font_01_sfnt_off0000ecc6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECC6 17924 bytes
SHA-256: 518d03ae3bf39ccbd00122891a146c125e2077bb92d6ea3d03b39cfae4f84110
font_02_sfnt_off00011bb8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11BB8 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1