Malicious PDF — malware analysis report

Static analysis result for SHA-256 1a1be581c8cc4a47…

MALICIOUS

PDF

77.5 KB Created: 2021-09-09 00:44:15 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 6ce0ba1c9e4e48cb9fb5a3e4bc666f8a SHA-1: 70a9f9de06eb859525cb26c746b352a31f47133a SHA-256: 1a1be581c8cc4a473075b931dd9b31401a6656babde6f67c07dca8bf4855d701
166 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution T1059.007 JavaScript

The sample is a PDF document flagged by ML classifiers and ClamAV as malicious. Heuristics indicate it functions as a link farm and contains a lure for remote support tools, suggesting an attempt to gain unauthorized access. While no scripts were directly extracted, the PDF structure and embedded URLs point towards a phishing or social engineering attack, likely involving the exploitation of a PDF vulnerability to deliver a payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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
  • 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 http://indagosrl.it/userfiles/files/wijurafufizogetinoxezonim.pdf In PDF document text
    • http://filipdegreef.be/uploads/files/vomuwinawebagevewixu.pdfIn PDF document text
    • http://lex.tj/img/file/laleromajusuwu.pdfIn PDF document text
    • https://seikai.jp/free_images/files/89620638138.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/57121956433.pdfIn PDF document text
    • https://avantkart.com/wp-content/plugins/super-forms/uploads/php/files/d77c6sgb5t0hnrla2t2tfpf1bj/risepasebuvajokisa.pdfIn PDF document text
    • https://bonvoyageindia.in/ckfinder/userfiles/files/54850491544.pdfIn PDF document text
    • http://vncanada.vn/uploads/files/3842647272.pdfIn PDF document text
    • http://jamoncup.es/wp-content/plugins/formcraft/file-upload/server/content/files/16138b46040a41---47434339325.pdfIn PDF document text
    • https://pmsp-me.com/userfiles/files/wafafoboledi.pdfIn PDF document text
    • https://simpangkanan.com/contents/files/82379180643.pdfIn PDF document text
    • http://hejia-ele.net/upload/vobawejuwamilu.pdfIn PDF document text
    • https://andymullinscommercial.com/home/andy/public_html/ckfinder/userfiles/files/86984348330.pdfIn PDF document text
    • http://jolanyee.com/upload/files/202109021646538962.pdfIn PDF document text
    • https://fisheaglesafaris.net/pics/user/file/padabisudok.pdfIn PDF document text
    • https://alternativi.brtim.com/uploads/wysiwyg/files/47970870018.pdfIn PDF document text
    • http://crabandclaw.com/uploads/files/46094033770.pdfIn PDF document text
    • http://sanfrancescovet.com/userfiles/files/fidojarofat.pdfIn PDF document text
    • https://socardan.com/userfiles/files/bovagi.pdfIn PDF document text
    • http://ptsound.com/plugins/ckfinder/userfiles/files/5190477609.pdfIn PDF document text
    • http://commissioncollectionlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/zexolevixomidumefaxirub.pdfIn PDF document text
    • http://boissee.fr/userfiles/file/40065154371.pdfIn PDF document text
    • http://omonetach.pl/foto/ilustracje/file/14359727965.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/70218704673.pdfIn PDF document text
    • https://binarbaid.com/public_html/userfiles/file/65061456908.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/FevRqgeaUVY/uplcv?utm_term=can+you+control+another+phone+from+your+phonePDF 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_off0000c9d0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9D0 10728 bytes
SHA-256: 0ee7c73fbd4f9fd3cf43de1a4b252e16e36244cb534828b214a010fe7bff331c
font_01_sfnt_off0000e253.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE253 17752 bytes
SHA-256: 76cef2dfae1a4ead6abf20dcb936d48d830aaaa3474a9137af825a7741ed9fe0
font_02_sfnt_off00010ffd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10FFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1