Malicious PDF — malware analysis report

Static analysis result for SHA-256 d37eba88b10af19d…

MALICIOUS

PDF

82.8 KB Created: 2021-09-17 04:37:23 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-31
MD5: 31334d238a4fddf27404abc825926094 SHA-1: 8dab8b1855c3b60c23df266bde5f96638496d7f1 SHA-256: d37eba88b10af19da04de573aa4bec620a5c074c13070ff7efc716d7bac50d86
166 Risk Score

Malware Insights

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

The PDF document exhibits malicious characteristics, including a high ML classifier score and ClamAV detection as a phishing trojan. It employs a remote-support tool lure, instructing users to install or connect to such tools, which is a high-risk activity in unsolicited documents. The document also contains numerous external URIs, suggesting it acts as a downloader or redirects to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Remote-support tool lure high SE_REMOTE_SUPPORT_LURE
    Document instructs the user to install, open, or connect with a remote-support tool such as AnyDesk, TeamViewer, Quick Assist, or ScreenConnect — high-risk in an unsolicited document
  • 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://garglob.ru/uplcv?utm_term=vnc+viewer+kali+linux+android PDF link annotation
    • http://xaydunglenguyen.vn/upload/files/b757ef.pdfIn PDF document text
    • https://webmodels.studio/wp-content/plugins/formcraft/file-upload/server/content/files/161352bab215c1---nupemefurolujakogawez.pdfIn PDF document text
    • https://communeouchamps.fr/userfiles/file/85112322929.pdfIn PDF document text
    • http://sqc.jp/user_data/editor/ckfinder/core/connector/php/upload/files/kolavovenug.pdfIn PDF document text
    • https://consurs.ro/ckfinder/userfiles/files/tudagojazuri.pdfIn PDF document text
    • https://peltonfell.org.uk/ckfinder/userfiles/files/20501563701.pdfIn PDF document text
    • https://adoz.cz/ckfinder/userfiles/files/51030941699.pdfIn PDF document text
    • https://samsungklimamodelleri.com/upload/ckfinder/files/vejunovakibepoletuwemaw.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/dikilupovenosuvu.pdfIn PDF document text
    • https://congchungnguyenlieu.vnpec.xyz/uploads/files/72830965424.pdfIn PDF document text
    • https://tennis-samara.ru/img/file/nipofimipise.pdfIn PDF document text
    • https://rougezenekar.hu/files/file/riwilutufezuvigodalugo.pdfIn PDF document text
    • http://www.fliesen-brill.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613d9bf84d655---53186531115.pdfIn PDF document text
    • http://www.protectakoteasia.com/ckfinder/userfiles/files/redaxotisafobuboresux.pdfIn PDF document text
    • https://numen-wow.com/userfiles/cloud/files/bofekunadawigow.pdfIn PDF document text
    • https://thietkeweblongan.com/upload/files/lewigawasigasulewupe.pdfIn PDF document text
    • http://bestofbeer.ru/ckfinder/userfiles/files/davav.pdfIn PDF document text
    • http://yesfabric.com/images/upload/File/tedabap.pdfIn PDF document text
    • http://rockpapersun.com/upload_mce_image/file/47185562352.pdfIn PDF document text
    • http://daglichtfilters.nl/ckfinder/userfiles/files/1534941640.pdfIn PDF document text
    • http://hamdannepal.com/userfiles/file/67998339007.pdfIn PDF document text
    • http://4reality.cz/userfiles/files/32107538125.pdfIn PDF document text
    • http://cissi.it/userfiles/files/93289944873.pdfIn PDF document text
    • http://zhongjiukeji.com/upload_fck/file/2021-9-1/20210901225651566142.pdfIn PDF document text
    • https://vidaleve.ind.br/ckfinder/userfiles/files/tisebavum.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_off0000ce48.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE48 10512 bytes
SHA-256: a22927ec41b0fbf0a8961199dd2a9d925bfc380402609f52880632d1e5fc0844
font_01_sfnt_off0000e652.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE652 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fe64.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFE64 23652 bytes
SHA-256: 120fc9af589e02b79386724890ed0c44458dd46ff15c6ee8e3a7efc9be6df02b