Malicious PDF — malware analysis report

Static analysis result for SHA-256 e690e981ea18277e…

MALICIOUS

PDF

71.9 KB Created: 2021-09-18 07:28:25 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 75a94f7440f6cf2420d5aed15df8291b SHA-1: 2409b039d401e12f838ab0ee56ab88e4f8e2283a SHA-256: e690e981ea18277e0253b9c22f7cdf42d9448a60feb7f1ca3b55006fd17af784
126 Risk Score

Malware Insights

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

The PDF document was flagged by ClamAV and an ML classifier as malicious. It contains numerous embedded URLs, many of which point to other PDF files hosted on potentially disposable domains, indicating a link farm designed to obscure the true destination. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests a malicious intent, likely to lure users to phishing sites or download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9827

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 http://pobierzplik.pl/uploads/files/regujadosetizotabu.pdf In PDF document text
    • https://protradingindia.net/userfiles/file/wirogugizudazizugosiriwef.pdfIn PDF document text
    • https://sistemkabin.com/ckfinder/userfiles/files/61591692887.pdfIn PDF document text
    • http://digifast.cz/userfiles/72203824903.pdfIn PDF document text
    • http://www.smartusb.info/images/library/File/47480386584.pdfIn PDF document text
    • http://duepassidalcentro.it/userfiles/files/57345735926.pdfIn PDF document text
    • http://somsit.com/ckfinder/userfiles/files/13298589155.pdfIn PDF document text
    • http://euskararenginkana.eus/files/galeria/files/49085857334.pdfIn PDF document text
    • http://www.waetsukai.jp/system/ckfinder/userfiles/files/34617001041.pdfIn PDF document text
    • https://dichvuhappyhouse.com/upload/files/kofamomazuwo.pdfIn PDF document text
    • https://sushixusa.com/userfiles/files/ledokemezi.pdfIn PDF document text
    • http://seychelles-resort.com/images/blog/file/sekegoselib.pdfIn PDF document text
    • http://thibidi.vinadesign.info/uploads/images/files/15601571187.pdfIn PDF document text
    • http://xn--82cac8d3ajrc0gd0bo4a7nf3qg.com/userfiles/files/32393279076.pdfIn PDF document text
    • http://hitecds.com/userfiles/file/kebupemesu.pdfIn PDF document text
    • http://lpc2529.com/piceditor/file/71541850200.pdfIn PDF document text
    • http://tribo.kz/userfiles/File/56882460702.pdfIn PDF document text
    • http://rayer.cn/d/files/zowukez.pdfIn PDF document text
    • https://travels-ukraine.com/wp-content/plugins/formcraft/file-upload/server/content/files/161312bd003032---debapetowome.pdfIn PDF document text
    • https://global-product.org/CKEdit/upload/files/worazubarubiwodafe.pdfIn PDF document text
    • http://tks-forever.com/upload/2021/09/13/file/sogudirexukifusonub.pdfIn PDF document text
    • http://homeshopeez.com/uploaded_files/userfiles/files/dipigak.pdfIn PDF document text
    • http://tpt.taipei/asset/uploads/files/3822998431.pdfIn PDF document text
    • http://xmzhj.com/UserFiles/file/58645789406.pdfIn PDF document text
    • http://esperanzadeavila.com/fotos/file/86077695581.pdfIn PDF document text
    • http://maynenkhiinverter.com/media/ftp/file/58080701790.pdfIn PDF document text
    • https://johanbjerke.se/userfiles/file/foxojigaxapajabofatenemi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/1xuhb7AK25c/uplcv?utm_term=mx+player+all+format+supportPDF 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_off0000b61c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB61C 16680 bytes
SHA-256: 13a709547cf1b874dec695469fa393c2f13ecef3aa58ebdeb70a6867f54dd96f
font_01_sfnt_off0000e151.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE151 10632 bytes
SHA-256: af47e5970878301d0d4ce362a008c891216317c465a354950f21694724dbdf09
font_02_sfnt_off0000f9d4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1