Malicious PDF — malware analysis report

Static analysis result for SHA-256 c2f00f1051774afd…

MALICIOUS

PDF

71.0 KB Created: 2021-09-26 11:52:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 95a4fc63cb54b124a05a4218d8c68878 SHA-1: b82079618fbc0804c44721f30b72924848a7522a SHA-256: c2f00f1051774afd7218af4961372dfb08581b41554587419466c552ace750ef
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file containing embedded JavaScript, which is a common technique for executing malicious code. It also hosts a large number of external URIs, many of which are linked to disposable domains and appear to be part of a link farm designed to redirect users. The ClamAV detection and ML classifier strongly indicate malicious intent, likely phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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=latest+hd+streamz+apk+download PDF link annotation
    • http://dc-8aaac82755d3.breakthroughwell.com/userfiles/files/ramelujoto.pdfIn PDF document text
    • https://xn--90aweabvm.xn--p1ai/ckfinder/userfiles/files/77049521332.pdfIn PDF document text
    • https://personalloan2u.com/wp-content/plugins/super-forms/uploads/php/files/593b6bb686a525d9649d0c2ef40eb5a9/nifufunixaviv.pdfIn PDF document text
    • http://bankerz.in/qpic/files/rufoxizubax.pdfIn PDF document text
    • http://avon-bratislava.com/files/files/ditasuzozepig.pdfIn PDF document text
    • http://www.tlo.ntou.edu.tw/ckfinder/userfiles/files/werotivujaxetozaja.pdfIn PDF document text
    • https://mattress-leader.com/media/tewaxalova.pdfIn PDF document text
    • http://idolyokocho.com/js/ckfinder/userfiles/files/mixesumepapajez.pdfIn PDF document text
    • http://pc-driver.ru/userfiles/files/mulix.pdfIn PDF document text
    • http://falconfam.com/ckfinder/userfiles/files/61258184727.pdfIn PDF document text
    • http://fjzy18.com/image/uload/files/65564979873.pdfIn PDF document text
    • https://fzclicks.com/demo/files/editor/file/539890837.pdfIn PDF document text
    • http://artediapharma.com/upload/files/gikosimixeli.pdfIn PDF document text
    • http://mackyz7automotive.com/js/upload/files/8626819666.pdfIn PDF document text
    • http://ceomit.com/fckupload/file/28862879298.pdfIn PDF document text
    • https://ofertaromania.ro/ckfinder/userfiles/files/gepodojabixepewamasev.pdfIn PDF document text
    • http://changwontour.kr/FileData/ckfinder/files/20210901_718EE5D5E84ECAB9.pdfIn PDF document text
    • http://www.nisbd.com/wp-content/plugins/formcraft/file-upload/server/content/files/161472af7aacd0---burowovafimo.pdfIn PDF document text
    • https://apra.pl/files/file/8924802145.pdfIn PDF document text
    • http://massimomoroni.it/userfiles/files/38830142475.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/tigazi.pdfIn PDF document text
    • https://vleek.com/uploads/files/10019914619.pdfIn PDF document text
    • http://anthonyvienna.com/sites/default/files/file/walevujas.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_off0000b250.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB250 10760 bytes
SHA-256: 7f0679e4c91ff58d70643ed3526bb3ddc599d0ac1ab768254817e873218ae71a
font_01_sfnt_off0000caff.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAFF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e311.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE311 16636 bytes
SHA-256: 8422fd23934c2d66eb2bd899b7265a485a6a95875e3cdaded26f1f9e4ebab8db

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