Malicious PDF — malware analysis report

Static analysis result for SHA-256 cdb1bb550e4e37f4…

MALICIOUS

PDF

85.1 KB Created: 2021-09-20 23:14:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: e8ddc1fe3490a6a569f36f9c70bdadbd SHA-1: acbae07087eddff6508593dfa648487dc86b7416 SHA-256: cdb1bb550e4e37f41da793c49b90f06cfea58ac80ba1cce42028ab276ea47a9d
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a large number of embedded URIs, many of which point to disposable hosting, indicating a link farm or phishing lure. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were explicitly extracted, the PDF structure and embedded URIs are indicative of a phishing or malware distribution campaign, likely initiated via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://archism.ru/uplcv?utm_term=el+gesticulador+pdf PDF link annotation
    • https://gujaratisamajparis.org/upload/files/barenofowazi.pdfIn PDF document text
    • http://www.laterveer-biesenbeek.nl/ckfinder/userfiles/files/binupawubilarofiji.pdfIn PDF document text
    • http://haki.vn/uploads/files/zabakekeze.pdfIn PDF document text
    • http://regcureguide.com/files/files/sogifarirut.pdfIn PDF document text
    • http://xn--m1age8bh.xn--p1ai/files/file/xumamosixariletawugabo.pdfIn PDF document text
    • https://marathonroller.com/userfiles/files/gelima.pdfIn PDF document text
    • http://trust-law-firm.com/userfiles/file/20210910222910_1723615655.pdfIn PDF document text
    • https://yaofangpeixun.com/upload/files/libewakomexanebovo.pdfIn PDF document text
    • http://amandamaitland.com/images/file/23596787734.pdfIn PDF document text
    • https://energiadirect.pl/application/resources/ckfinder/userfiles/files/gejinozarope.pdfIn PDF document text
    • http://curry-box-deluxe.de/userfiles/file/bojugojafabi.pdfIn PDF document text
    • http://bachova-terapia.sk/images/file/kokeriputufa.pdfIn PDF document text
    • http://bestbuyfromindia.com/userfiles/file/72381881795.pdfIn PDF document text
    • http://www.sospapa24.com/lib/ckfinder/imgupload/files/29498727250.pdfIn PDF document text
    • https://resttour.com/images/userfiles/files/wukobofixudawovori.pdfIn PDF document text
    • http://allefrgycg.news-read.com/upload/files/lazil.pdfIn PDF document text
    • http://utuin.net/files/fckeditor/file/11257258074.pdfIn PDF document text
    • http://gddfboiler.com/uploads/files/10179636261.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/zufenusisum.pdfIn PDF document text
    • http://gildiamasterov.ru/userfiles/file/diropesux.pdfIn PDF document text
    • https://siphouse96.com/wp-content/plugins/super-forms/uploads/php/files/7505595b76879dbeeca5477eb84f0654/bujujesagosijivawokevipek.pdfIn PDF document text
    • http://nhatrangpalace.vn/app/webroot/upload/files/82068220881.pdfIn PDF document text
    • http://e-store-sys.com/userfiles/file/takagi.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_off0000e306.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE306 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fb1d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFB1D 10772 bytes
SHA-256: 2a9e1e63ae8e9a2765a6bb17269a0803685d1fb88e9e2ee27bdf264aef6570da
font_02_sfnt_off000113d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x113D2 19996 bytes
SHA-256: 4c3c53e796458815d2851e00785a0963050649c7e4e952961f464bb7f4782bbb

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