Malicious PDF — malware analysis report

Static analysis result for SHA-256 e3c9705e16c0d5cb…

MALICIOUS

PDF

83.6 KB Created: 2021-09-21 01:05:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 58560ac7800319115fa376b75e5af77c SHA-1: 04618997cf60b28145e14ae4a040341b9040c9ce SHA-256: e3c9705e16c0d5cbe5b9bddddf6fd45c6d72e3dde73881100b7091f7bc27c55c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and a machine learning classifier indicated a high probability of maliciousness. The file contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm, suggesting a phishing or malware distribution attempt. The document body is heavily obfuscated, preventing a clear understanding of its direct content, but the overall structure and URL analysis strongly indicate malicious intent.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9911

Heuristics 5

  • 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.
  • 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://pistant.ru/uplcv?utm_term=we+2012+game+download+winning+eleven+2012+android+apk PDF link annotation
    • http://lubrifianti-auto.ro/files/file/73832684654.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/lixubedogagotofu.pdfIn PDF document text
    • https://www.iimranchi.ac.in/ckfinder/uploads/userfiles/files/79583283278.pdfIn PDF document text
    • http://alemotta.com/resources/original/file/94622375363.pdfIn PDF document text
    • http://www.sushmitamukherjee.com/fckimages/file/zajuvuxigog.pdfIn PDF document text
    • https://infotechb2blite.com/bot/ckfinder/uf/files/85773088556.pdfIn PDF document text
    • http://www.hkwebdesign.com.hk/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae395e5aba---sasesitizovuz.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/65369912134.pdfIn PDF document text
    • http://metafelix.it/userfiles/files/sutusajutegetajilu.pdfIn PDF document text
    • https://maydongy.com/wp-content/plugins/super-forms/uploads/php/files/sfevd50sqmsji2ajtft0keq223/guraxepuvunujagegosobarok.pdfIn PDF document text
    • http://vladekoservis.ru/files/mopegupagajabalodenuwopot.pdfIn PDF document text
    • http://bright-mineral.com/uploadfile/file/2021091104001970.pdfIn PDF document text
    • https://fnb-concepts.com/images/uploads/files/62692623726.pdfIn PDF document text
    • https://edouardweil.com/userfiles/file/tipurepive.pdfIn PDF document text
    • http://saikunghouse.hk/userfiles/kobigofuliwogogotebeti.pdfIn PDF document text
    • http://grawerlik.pl/userfiles/file/9032017521.pdfIn PDF document text
    • http://op-gold.com/ck_image/files/soxiro.pdfIn PDF document text
    • https://psfund.org/public/uploads/files/cms_files/36003739807.pdfIn PDF document text
    • http://portalcom-b2b.es/img/user//file/_0123321001630627466.pdfIn PDF document text
    • http://josephfellerlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/nanigadawufosenuw.pdfIn PDF document text
    • https://vietcuongcorp.com/uploads/news/files/mugip.pdfIn PDF document text
    • https://girilawfirm.com/content_files/files/peloroxetirowadajesuxobu.pdfIn PDF document text
    • http://ping-property.com/user_img/files/wirixubeleli.pdfIn PDF document text
    • http://tkhomedeco.com/assets/uploads/ckedit/files/20210919105744.pdfIn PDF document text
    • http://mislenyiallatorvos.hu/userfiles/file/dilijofatinitiwil.pdfIn PDF document text
    • http://amsasecretariat.fr/userfiles/file/rerozasi.pdfIn PDF document text
    • http://thienminhgroup.com/uploads/userfiles/file/58965525641.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_off0000e201.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE201 17004 bytes
SHA-256: bd3e41b2b5fc9ecf4546d7b5f515248e5d57b6e6b763ce938aab10ea447dfeb3
font_01_sfnt_off00010e87.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E87 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001269e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1269E 11000 bytes
SHA-256: 4e0a08abf105f16b10f46b3da200656b7599ac97833a019705d891a5b6c72287