Malicious PDF — malware analysis report

Static analysis result for SHA-256 ead9f2db08604d09…

MALICIOUS

PDF

68.1 KB Created: 2021-10-02 17:48:48 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 644a36b004cf3dcbb72e644d2b6f3a94 SHA-1: 8734df1fd0e740aab9060cebad2dfeb4c7df42ac SHA-256: ead9f2db08604d096826e385608f263ea9155447f243e352fc814584d9619027
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is identified as a malicious PDF by ClamAV and an ML classifier. Heuristics indicate it uses an image-only lure with a clickable action, typical of phishing attempts. Embedded JavaScript and numerous external URIs suggest an attempt to redirect the user to malicious content or download further payloads.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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 http://jagodkaprzedszkole.pl/userfiles/file/sijazo.pdf In PDF document text
    • http://dientrotiendathc.com/media/ftp/file/98520890684.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/puvorowagojinufimirigox.pdfIn PDF document text
    • http://aftckwt.com/uploads/file/29961509294.pdfIn PDF document text
    • http://babijie.com/upload_fck/file/2021-9-11/20210911150215237408.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/34094355888.pdfIn PDF document text
    • https://unitjaya.com/contents/files/vuraxafadudewonebeliwi.pdfIn PDF document text
    • https://probidjp.com/ckfinder/userfiles/files/20210920_090805.pdfIn PDF document text
    • http://klubalfa.org/img/userfiles/file/divadotukimomogu.pdfIn PDF document text
    • https://hv2barrier.com/application/third_party/ckfinder/userfiles/files/bukudoruxotebobobop.pdfIn PDF document text
    • https://ht-cooling-j3t.com/contents/files/37718133299.pdfIn PDF document text
    • https://hbfilm.ca/resimler/files/woriximake.pdfIn PDF document text
    • http://stonepigments.com/userfiles/file/340541752.pdfIn PDF document text
    • https://irish-setter-zucht.info/ckfinder/userfiles/files/webekixejiwol.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614102742086e---10328459795.pdfIn PDF document text
    • http://lovesenergy.nl/file/fulasedidejabewakif.pdfIn PDF document text
    • https://chachachat.info/js/ckfinder/userfiles/files/rupunajaguxulemigeg.pdfIn PDF document text
    • https://cuatudongsaigon.net/uploads/files/gimuwefitedegelufubuv.pdfIn PDF document text
    • http://petrovaskola.sk/userfiles/imagefile/bujafelojiretumediwejo.pdfIn PDF document text
    • https://www.keystonecare.co.uk/wp-content/plugins/super-forms/uploads/php/files/e13014740dd9300da51deb8ec31d8759/3255269629.pdfIn PDF document text
    • http://computer-rudolstadt.de/upload/file/24797820790.pdfIn PDF document text
    • http://amicissiapiemonteisa.it/userfiles/files/58517295071.pdfIn PDF document text
    • http://kidsjeodo.com/images/files/90081532240.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=form+validation+in+reactPDF 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_off0000b1a5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1A5 10404 bytes
SHA-256: 81b0f56bb9068768cfc8500532cee89090d7b5d9453db71bffd19bfdd5b8d69d
font_01_sfnt_off0000c922.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC922 13616 bytes
SHA-256: f02f4cb331c0394071bde699bfd0ff8b861997f7a9cbe56528a8c25ad4d3ea3d
font_02_sfnt_off0000ead4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1