Malicious PDF — malware analysis report

Static analysis result for SHA-256 df6572f2056f1e3a…

MALICIOUS

PDF

79.1 KB Created: 2021-09-12 02:48:24 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bfffab14abcc39f2150138745081bbae SHA-1: 980dd65cc63566ba32f95dbcaf7d3b70ee14d8fa SHA-256: df6572f2056f1e3af403f35a968b5afc053f87206ea69e5b1e2f8c0da0743520
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by multiple heuristics, including a high-confidence ML classifier and ClamAV, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests the document is designed to host a large number of links to other PDFs, likely as part of a phishing or malware distribution campaign. While no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://egyseg.eu/ckfinder/userfiles/files/88918661530.pdf In PDF document text
    • http://training-solutions.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613d37267884b---lemef.pdfIn PDF document text
    • http://tensoinox.com/userfiles/files/7701550259.pdfIn PDF document text
    • https://mimpishio2bet.net/contents/files/11092867712.pdfIn PDF document text
    • https://www.lipca.com/ckfinder/userfiles/files/falogusunoziboxipiximub.pdfIn PDF document text
    • http://aivieksteslaivas.lv/userfiles/file/73997159298.pdfIn PDF document text
    • http://lexprikson.com/admin/style/images/userfiles/file/34314266321.pdfIn PDF document text
    • http://quiltingacademy.info/fckeditor/userfiles/file/zobivojizegetiz.pdfIn PDF document text
    • https://confeccionesruiz.cl/UserFiles/File/xewifiguditizulenaritod.pdfIn PDF document text
    • https://tonere.shop/app/webroot/files/userfiles/files/40682618232.pdfIn PDF document text
    • http://hotel-gerard-dalsace.com/upload/document/78471416223.pdfIn PDF document text
    • http://grandviewgroupresort.com/upload/files/45630375674.pdfIn PDF document text
    • http://www.dean-cpa.com/files/adminpic/file/meluragedaf.pdfIn PDF document text
    • https://bak.vn/upload/files/bifavub.pdfIn PDF document text
    • http://austral-immo.com/userfiles/files/69059589859.pdfIn PDF document text
    • http://www.xpresswedding.com/wp-content/plugins/formcraft/file-upload/server/content/files/16134fa8342b41---53177495238.pdfIn PDF document text
    • http://alconsprom.ru/ckfinder/userfiles/files/supapakedenaxunujurexa.pdfIn PDF document text
    • https://treasurehunterdetectors.solar-ovens.net/ckfinder/userfiles/files/kodimajerisufipufevunim.pdfIn PDF document text
    • https://elearning-chemistry.ro/userfiles/file/90369202214.pdfIn PDF document text
    • http://inggeo.eu/userfiles/files/retexibetaki.pdfIn PDF document text
    • https://e-ssuances.com/ckfinder/userfiles/files/kosudonelatamulaseb.pdfIn PDF document text
    • https://k85shj16h-561lt.com/contents/files/22560849743.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/A3Ryygt5BCM/uplcv?utm_term=silent+hill+juego+para+android+apkPDF 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_off0000d035.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD035 10900 bytes
SHA-256: 70a63a0a53a5ea75b314a400cdc22892bd73fa876c383b5bbfec0b7ecae95072
font_01_sfnt_off0000e918.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE918 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0001012a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1012A 17780 bytes
SHA-256: a0904ffeafff448d52f9451fbc516c4ebb47cd3876b2d28634df99dcc7511f97

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