Malicious PDF — malware analysis report

Static analysis result for SHA-256 e53628962887d8bd…

MALICIOUS

PDF

82.6 KB Created: 2021-09-21 15:56:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 36e542d42d792d7064bcda03253e5fb0 SHA-1: 0bd9b055226f7be5fc664b8f46f8415e63d0d470 SHA-256: e53628962887d8bd4fab47864e0a3791bd42d8fe68b2979517d67d619bafce77
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF containing numerous embedded URLs, many of which are hosted on disposable domains and appear to be part of a link farm. One prominent URL, 'https://wastran.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+game+download', suggests a lure related to game downloads. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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://wastran.ru/uplcv?utm_term=harry+potter+and+the+philosopher%27s+stone+game+download PDF link annotation
    • http://haai.org/upload/file/40054813855.pdfIn PDF document text
    • http://mptech.vn/ckfinder/userfiles/files/tomuporozexufej.pdfIn PDF document text
    • https://zlatartopalovic.rs/files/98306355291.pdfIn PDF document text
    • http://top1np.com/ckfinder/userfiles/files/61224752552.pdfIn PDF document text
    • http://dexgerm.com/data/file/userfiles/files/9118909066.pdfIn PDF document text
    • http://ceresasrl.it/userfiles/files/keleko.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613da7cd57948---miban.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/bimuvexaluvolufa.pdfIn PDF document text
    • http://scuderieverdina.it/scuderia/userfiles/file/78131489348.pdfIn PDF document text
    • http://copy-office.it/userfiles/file/61478040583.pdfIn PDF document text
    • https://ckmusicdesign.nl/userfiles/file/74167416079.pdfIn PDF document text
    • https://anmoul.com/userfiles/file/96264389139.pdfIn PDF document text
    • http://munnarinfo.in/userfiles/file/dozotonulubiwa.pdfIn PDF document text
    • https://dmddsgn.com/wp-content/plugins/super-forms/uploads/php/files/b8838a762d5f92544f5dec0412fe8e13/rusuwu.pdfIn PDF document text
    • https://oolong-dining-co.com/webroot/editor-uploads/files/94758916188.pdfIn PDF document text
    • http://abwbaltimore.com/uploads/files/93431967787.pdfIn PDF document text
    • https://eobliecky.sk/userfiles/file/21609524539.pdfIn PDF document text
    • https://people11people.gr/uploads/File/6305940906.pdfIn PDF document text
    • http://footstepfloor.com/upfiles/files/85675910013.pdfIn PDF document text
    • https://rybczewice.pl/userfiles/file/medewojajebubap.pdfIn PDF document text
    • http://willowslakerhea.org/userimages/lukorulizivule.pdfIn PDF document text
    • http://stmarysharipad.com/userfiles/file/nemupozetadituzeditev.pdfIn PDF document text
    • https://theloneranger.tv/clients/loneranger/ckfinder/userfiles/files/jufapujomonoxasugazuj.pdfIn PDF document text
    • http://dgjinhak.kr/DATA/upload/files/202109140320116342.pdfIn PDF document text
    • http://worldsocialistpartyindia.org/ckfinder/userfiles/files/dotegoj.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_off0000db89.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDB89 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f39b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF39B 18016 bytes
SHA-256: 518ba8a4d6c4ed4f43f146855f84f8704811100554e11f1819d3f79a9a3fc6fc
font_02_sfnt_off00012289.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12289 11064 bytes
SHA-256: c3daa7c320dc7572ba7750f8813b70710060e9dc0900847948d7eff11543e2ac

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