Malicious PDF — malware analysis report

Static analysis result for SHA-256 b3a908032229e2fc…

MALICIOUS

PDF

76.4 KB Created: 2021-09-11 20:56:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 0f7fa127aa7e9faa2ee66d7bca5a14da SHA-1: bf4cb0115dd06250fb6565ac3c4c0e404ce149df SHA-256: b3a908032229e2fc1249a9c2b07bff1949c74153cc3b39c8cb4a8f048e58b094
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and ML classifiers, indicating a high likelihood of malicious intent. Numerous external URLs were extracted, many of which are associated with link farms and disposable hosting, suggesting a phishing or malware distribution campaign. The PDF structure and embedded URLs point towards a spearphishing attachment attack vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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://ketchas.ru/uplcv?utm_term=mp3+converter+downloader+online PDF link annotation
    • http://indcms.testingmachines.com/images/file/vozanomokej.pdfIn PDF document text
    • http://asesoriazabalburu.org/azaba/files/file/jibibujivanaxo.pdfIn PDF document text
    • http://vatlieubaooncachnhiet.com/userfiles/file/xaxokimarukagowi.pdfIn PDF document text
    • http://sungsam.net/userData/board/file/lemejadesokoder.pdfIn PDF document text
    • http://starinviter.com/ckimagefiles/felakisapiperix.pdfIn PDF document text
    • https://mimpishiosatu.com/contents/files/98592145937.pdfIn PDF document text
    • https://e-ceramika.pl/userfiles/file/lobavoguzanadavixukabot.pdfIn PDF document text
    • http://bradhelferlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/xuvigedixasapuzijojilebiv.pdfIn PDF document text
    • http://poorclarescork.ie/images/xatobij.pdfIn PDF document text
    • https://tekstilkentrehber.com/upload/ckfinder/files/74016499710.pdfIn PDF document text
    • http://skuplaptop.pl/wp-content/plugins/formcraft/file-upload/server/content/files/1613889606f4cf---41284459220.pdfIn PDF document text
    • http://emilygrilltogo.com/uploads/files/vuxixuxogine.pdfIn PDF document text
    • http://tandartsindex.nl/images/uploads/51066059000.pdfIn PDF document text
    • http://scouttautomotive.com/editor_uploads/system/files/refajuvojulesif.pdfIn PDF document text
    • http://hotstamping.pl/files/file/34324044652.pdfIn PDF document text
    • http://thecargonepal.com/userfiles/file/kowilomagipomamisexun.pdfIn PDF document text
    • http://kozelskadm.ru/files/uploads/files/riwimuro.pdfIn PDF document text
    • https://mallncart.com/userfiles/files/73806007864.pdfIn PDF document text
    • http://the-bom.kr/upfile/files/4086076887.pdfIn PDF document text
    • http://beloezoloto.ru/userfiles/file/duwafodisogoxifopulotez.pdfIn PDF document text
    • https://rt9.rspo.org/ckfinder/userfiles/files/bolipodubewobirubup.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_off0000c6c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6C3 17172 bytes
SHA-256: 8ad7cf6e32f550f5a2172554c3d17b4056eb6f1294dfe5f8158e36c4b77ed275
font_01_sfnt_off0000f31f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF31F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010b36.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10B36 10656 bytes
SHA-256: dea887ae3a2a6c3c2828564374c4441f259e60b2751b04c29a087ff5358714e7

Open this report in the interactive analyzer, or submit your own file for analysis.