Malicious PDF — malware analysis report

Static analysis result for SHA-256 03cfaf27d2b96e2e…

MALICIOUS

PDF

69.6 KB Created: 2021-09-27 22:01:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: b662902db62b10ddf21eafb3dfba4a3c SHA-1: d4ae5b54eadf6e50e23d5795c95b9153b7773a08 SHA-256: 03cfaf27d2b96e2e37eef1c7f444744d94aae10005c15d0e9cca1bc5caa5754a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF contains a large number of embedded URLs pointing to various domains, suggesting a link farm or phishing campaign. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic specifically highlights the nature of these links, many of which appear to be disposable and hosted on potentially untrusted domains.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://oniceh.ru/uplcv?utm_term=car+for+gta+sa+android PDF link annotation
    • http://sigmabhp.pl/userfiles/file/2708489484.pdfIn PDF document text
    • http://loca-granderoue-montaletang.com/ckfinder/userfiles/files/dekevew.pdfIn PDF document text
    • https://pecsikult.hu/files/file/18033514910.pdfIn PDF document text
    • http://zjleiou.com/images/upload/File/86270085853.pdfIn PDF document text
    • http://miet-boot.ch/images/uploadedimages/file/66795238356.pdfIn PDF document text
    • http://iccarrentals.com/files/file/64742770024.pdfIn PDF document text
    • http://lpsa.cz/userfiles/file/litusolinegafamufi.pdfIn PDF document text
    • http://ednak.com/wp-content/plugins/formcraft/file-upload/server/content/files/16151ecb5b95bc---kotavarexekasul.pdfIn PDF document text
    • https://loppisidjupdalen.se/images/uploaded/file/rezadesitad.pdfIn PDF document text
    • http://www.expo-hotel.com/english/wp-content/plugins/formcraft/file-upload/server/content/files/1614197fa6f4eb---71113532159.pdfIn PDF document text
    • https://valkexclusief.reviewz.eu/app/webroot/files/userfiles/files/37240757607.pdfIn PDF document text
    • http://orthodoxnews.us/file/sususi.pdfIn PDF document text
    • https://lecormier-menuiserie.com/www/upload/files/titem.pdfIn PDF document text
    • http://easternhoteljeju.com/FileData/ckfinder/files/20210906_EDCBD88CA4FB70A9.pdfIn PDF document text
    • http://staceyasp.com/UserFiles/file/gawixubuse.pdfIn PDF document text
    • http://grupomarsamo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613a375551890---luvekesuxiruzelegux.pdfIn PDF document text
    • http://www.anapharmata.hu/ckfinder/core/connector/php/files/31768770153.pdfIn PDF document text
    • http://ryukatsu.com/userData/board/file/14337595224.pdfIn PDF document text
    • http://a-aqua.fr/ressource/site-image/files/94485155502.pdfIn PDF document text
    • http://imobilestore.de/userfiles/file/furodig.pdfIn PDF document text
    • http://ues-rb.ru/themes/ues-rb.ru/files/debelij.pdfIn PDF document text
    • http://sendedianqi.com/upload_fck/file/2021-9-12/20210912124334594042.pdfIn PDF document text
    • http://webs123.com/userfiles/file/21581097867.pdfIn PDF document text
    • http://hlqh.net/userfiles/file/20210921055206_465769027.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/97086473195.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_off0000b0a6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0A6 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8BD 10380 bytes
SHA-256: 3dae7472be49f0ae7116ade015ef0eea4d155678980eb26aeb88eaba097c77a8
font_02_sfnt_off0000e021.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE021 15988 bytes
SHA-256: 69d05866f76a8e3988817140f9a7111f3c091a88089b9e65475373d1b8395c24