Malicious PDF — malware analysis report

Static analysis result for SHA-256 9351ca26f4eca0e4…

MALICIOUS

PDF

83.2 KB Created: 2021-10-04 17:28:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-22
MD5: 27c5346607be8f8d286e21b623783088 SHA-1: 894f4ffbddf81410e6ecf841ad1cb23dc1b21eff SHA-256: 9351ca26f4eca0e4a195332b81f652787c3ab70568dd8103b72c45e499b34198
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by ML and ClamAV as malicious, with specific heuristics indicating it is a link farm on disposable hosting. The document body is heavily obfuscated and unreadable, but the presence of numerous URLs, many pointing to suspicious domains, supports the link farm and potential phishing or malware distribution attack pattern. No scripts were extracted from this sample.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9912

Heuristics 5

  • 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.
  • 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://fundoohairstyles.com/hairstyler/images/file/futiwosogunavigajadeka.pdf In PDF document text
    • http://www.ruben.pl/ckfinder/userfiles/files/11434202603.pdfIn PDF document text
    • http://koslita.eu/ckfinder/userfiles/files/wevudale.pdfIn PDF document text
    • http://kommunikator.nu/demo/userfiles/file///sakofazikomomib.pdfIn PDF document text
    • http://ivankotov.ru/img/lib/file/81527036732.pdfIn PDF document text
    • http://sonnenheizung.ch/fckeditor/editor/images/file/73852880641.pdfIn PDF document text
    • http://fairbank-ia.org/admin/ckfinder/userfiles/files/xemobirorazaxatidikuw.pdfIn PDF document text
    • http://gift-founder.com/archive/upload/files/pujasugubazamezadi.pdfIn PDF document text
    • http://hejia-ele.net/upload/77583079051.pdfIn PDF document text
    • https://promoxcenter.ro/ckfinder/userfiles/files/13228353072.pdfIn PDF document text
    • http://dworbieland.pl/userfiles/file/3200981152.pdfIn PDF document text
    • https://pielinks.com/UserFiles/file/wozavowus.pdfIn PDF document text
    • http://cicm2015.mist.ac.bd/app/webroot/ckfinder/userfiles/files/6946453095.pdfIn PDF document text
    • https://bokaichenyu.com/upload/files/joboki.pdfIn PDF document text
    • http://cokhitienvuong.com/uploads/files/3625701121.pdfIn PDF document text
    • http://pizzeria-millemiglia.de/app/webroot/img/editor/file/98757515050.pdfIn PDF document text
    • https://zooiguana.pl/app/webroot/media/files/46868767270.pdfIn PDF document text
    • http://elcwma.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/musuvewupu.pdfIn PDF document text
    • https://actionsporting.com/userfiles/files/givadun.pdfIn PDF document text
    • https://mk-pamyat.kz/uploads/files/fagebogudagalejuvi.pdfIn PDF document text
    • http://flairpens.ru/uploads/files/84428336650.pdfIn PDF document text
    • http://lovepetclinics.com/file_media/file_image/file/12653767052.pdfIn PDF document text
    • http://tiszaikaland.hu/upload/file/wozegi.pdfIn PDF document text
    • https://paloaltospeakerseries.com/wp-content/plugins/super-forms/uploads/php/files/23f1668a7f369da5690be15942d7ec1e/wetodape.pdfIn PDF document text
    • https://digiconelectronics.com/media/damigerox.pdfIn PDF document text
    • http://sreema.org/FCKeditor/file/labojefim.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/1KS0DP0cxss/uplcv?utm_term=furuncle+in+groin+areaPDF 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_off0000df5c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF5C 18476 bytes
SHA-256: 6b74f2f387b869ef45a078036f94f8422aa1a663e06fe8f484081d1aa861f9c2
font_01_sfnt_off00010fce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FCE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000127e5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x127E5 10216 bytes
SHA-256: db851d9633444ff078a51501e837888e7c09b6879822d4eba5686682bd3cdafa