Malicious PDF — malware analysis report

Static analysis result for SHA-256 bb96d61099bf02ea…

MALICIOUS

PDF

70.0 KB Created: 2021-09-26 04:49:43 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: af20adc21792fec800b4d78a0cbb3641 SHA-1: 70c5e355ad594dea531c7df503c0a343aac10dff SHA-256: bb96d61099bf02eade65b3f858926318b77c4afa67b3d581e12cf92c40302717
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with heuristics suggesting it functions as a link farm on disposable hosting, pointing towards a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of malicious activity.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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://garglob.ru/uplcv?utm_term=widget+pdf+android PDF link annotation
    • https://uhcp.com/editor_upload/file/tukerexo.pdfIn PDF document text
    • http://pizzeriadevita.it/userfiles/files/63003242344.pdfIn PDF document text
    • http://nanobubblevietnam.com/uploads/userfiles/file/68274865121.pdfIn PDF document text
    • http://igs.compcierge-asia.com/ckfinder/userfiles/files/sipob.pdfIn PDF document text
    • http://polipadel.com/userfiles/file/54986780296.pdfIn PDF document text
    • https://bcbc3399.com/upload/files/71601819256.pdfIn PDF document text
    • http://lamorenj.com/userfiles/file/25631455536.pdfIn PDF document text
    • http://levne-pohary.cz/UserFiles/File/97536113931.pdfIn PDF document text
    • https://charteriraq.ir/basefile/charteriraqir/files/dagiwexeli.pdfIn PDF document text
    • http://helder-effect.nl/userfiles/file/28909905370.pdfIn PDF document text
    • http://cornucopiafrederick.com/uploads/files/xoxakunul.pdfIn PDF document text
    • http://ottuk-e.org/userData/board/file/98100120357.pdfIn PDF document text
    • http://bakoca.hu/files/file/90533501082.pdfIn PDF document text
    • https://www.adler-leitishofen.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613f5f66c6e70---laxiruzof.pdfIn PDF document text
    • http://weforyou.it/userfiles/files/42093216763.pdfIn PDF document text
    • http://abnicum.ru/files/file/zibajovexiwojulisor.pdfIn PDF document text
    • http://isspskola.lv/userfiles/files/papefum.pdfIn PDF document text
    • http://defhjdr.friend-match.com/upload/files/nuluvorenebaku.pdfIn PDF document text
    • http://modero.vn/upload/files/jozojom.pdfIn PDF document text
    • http://www.valathors.com/ckfinder/userfiles/files/zisafugoda.pdfIn PDF document text
    • http://rld-carbon.com/file/momokonejivaravugukosano.pdfIn PDF document text
    • http://omnoiptv.com/outscapes/admin/ckeditor/uploads/ck/files/60260174796.pdfIn PDF document text
    • http://cctsw.net/whly/up_files/FCK/file/20210906_210651_190.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_off0000b19e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB19E 16160 bytes
SHA-256: f8754b4ced839ae6401b1ef1067bb69ecca7903ea1ffeb4edd9847a6958f81bc
font_01_sfnt_off0000dafd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAFD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f314.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF314 10452 bytes
SHA-256: 4068c657e2cfe01f4f86e678c63a6a83604117307c3c54371c5bd6ed555b15a3

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