Malicious PDF — malware analysis report

Static analysis result for SHA-256 83937eae05060647…

MALICIOUS

PDF

82.2 KB Created: 2021-09-11 15:37:56 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87dac9e2094713e7f39108c1cd2e7287 SHA-1: 69151e2a7df9e45ec8c048137cd940e1d8253a99 SHA-256: 83937eae0506064727267996a059c34eee239e77f16b7037878128e0d3c5bc7b
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains embedded JavaScript and numerous external URIs, many hosted on disposable domains, indicating a phishing or malware distribution attempt. The ClamAV detection and ML classifier strongly suggest malicious intent, likely involving exploitation of PDF vulnerabilities to redirect users to malicious sites. The presence of embedded JavaScript points to its use in executing malicious actions within the PDF.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://smidgel.ru/uplcv?utm_term=bajar+el+peso+de+un+pdf PDF link annotation
    • https://dermatologie-chamonix.com/userfiles/file/xumolovojupanunovuxerum.pdfIn PDF document text
    • https://transilvaniafishing.ro/app/webroot/files/userfiles/files/2407542310.pdfIn PDF document text
    • http://www.lifestaralberta.com/wp-content/plugins/formcraft/file-upload/server/content/files/161339ce5e7531---remafetixebavomokigufe.pdfIn PDF document text
    • https://irisapp.cn/uploadfiles/fckeditor/20210910/file/16312281297787.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/91991200670.pdfIn PDF document text
    • http://pactolous.hu/upload/file/gusax.pdfIn PDF document text
    • http://zeci.nl/im/image/sujajewuwozifulikele.pdfIn PDF document text
    • https://produse-zilan.ro/files/94579769996.pdfIn PDF document text
    • http://islaminkiel.de/webmisr/uploadwebmisr/file/56834929112.pdfIn PDF document text
    • http://portofmiamitunnel.com/system/js/back/ckfinder/userfiles/files/bejupofalerefebuz.pdfIn PDF document text
    • https://amkboiler.com/wp-content/plugins/super-forms/uploads/php/files/03tic534un6ggo2qhm1j0ge9as/vomulitazizejejupuwezevu.pdfIn PDF document text
    • https://www.prieur-equipement.com/ckfinder/userfiles/files/ridatajubewi.pdfIn PDF document text
    • http://www.hermosabeachbungalows.com/userfiles/files/jawenazimuf.pdfIn PDF document text
    • https://408of53crownstreet.com/assets/media/files/wudezilaxutudutefetaso.pdfIn PDF document text
    • http://malopolskiszlakwinny.pl/upload/File/xukisusuxerop.pdfIn PDF document text
    • http://yurisolomko.com/userfiles/file/5335145046.pdfIn PDF document text
    • https://hssanesteban.cl/files/pifarujetal.pdfIn PDF document text
    • https://rimi.sk/userfiles/file/xawumaxinezozumokipaveso.pdfIn PDF document text
    • http://studioschicchi.eu/userfiles/files/dumejubidipuvemikovosopu.pdfIn PDF document text
    • https://jewfri.kr/files/image/files/22955900352.pdfIn PDF document text
    • http://smartickgroup.com/userfiles/17662167886.pdfIn PDF document text
    • http://abwlargo.com/uploads/files/xepipufoje.pdfIn PDF document text
    • http://heydarbaba.org/resimler/files/xaboxibujetitotuba.pdfIn PDF document text
    • https://mptradingcompany.com/userfiles/file/99881459722.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_off0000da99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA99 18812 bytes
SHA-256: 662f087e110731c5939065bc92ee5d20aec30d3e3ae459f13cdc4dad9923c9d5
font_01_sfnt_off00010aab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10AAB 10584 bytes
SHA-256: 5f10028083b5ad29e88e782fae773fded04a63ed9837d6da9fc8a190658047d9
font_02_sfnt_off000122f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122F6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1