Malicious PDF — malware analysis report

Static analysis result for SHA-256 571a3eb7e12e1842…

MALICIOUS

PDF

85.9 KB Created: 2021-09-24 05:23:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: eed3246653a2217b2163d5c6274a7513 SHA-1: dff58888dbce1f17d8240286f8b2bf307fdecf2d SHA-256: 571a3eb7e12e184270d96a6a63f030d84b5e6e090cd8b1cb1f87504e425db45e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs, many of which are part of a link farm hosted on disposable domains, indicating a phishing or malware distribution attempt. 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 malicious document designed to redirect users to potentially harmful sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9980

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://catamma.ru/uplcv?utm_term=elementos+del+curriculo+pdf PDF link annotation
    • http://aburobocon2019.mnb.mn/uploads/files/kababibof.pdfIn PDF document text
    • http://bayernglobal.de/userVZ/file/19363250599.pdfIn PDF document text
    • https://allegypttours.net/userfiles/files/92929233703.pdfIn PDF document text
    • http://hcstonetw.com/uploads/files/202109021108081219.pdfIn PDF document text
    • https://www.playitdirect.ca/ckfinder/uploadfiles/files/bidorozogosilumekisopa.pdfIn PDF document text
    • http://copy2d.com/ftp/image/file/94677021049.pdfIn PDF document text
    • https://mycocoa.org/images/upload/files/ferolebiladas.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/23631786987.pdfIn PDF document text
    • https://xuantruongtech.com/images/ckeditor/files/54686790022.pdfIn PDF document text
    • http://satit.nrru.ac.th/satit/_Adminis/ckfinder/userfiles/files/56865797945.pdfIn PDF document text
    • http://falegnameriacastiglione.it/userfiles/files/99191705851.pdfIn PDF document text
    • https://el-tall.pl/pics/file/9954850258.pdfIn PDF document text
    • http://lubrifianti-auto.ro/files/file/galaful.pdfIn PDF document text
    • https://foodvellythailand.com/upload/files/dejupidolek.pdfIn PDF document text
    • http://sunmoon-glory.com/web/upload/files/30132883100.pdfIn PDF document text
    • http://conservationenergy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614b9021bec35---remitaz.pdfIn PDF document text
    • https://www.cukoyem.com.tr/wp-content/plugins/super-forms/uploads/php/files/cbg5hk600p5cd3mlrkduup46c2/lovizixoberotanifigefipa.pdfIn PDF document text
    • http://qishuochem.com/siicea/userfiles/file/pozek.pdfIn PDF document text
    • https://hotelmitrutarija.com/uploaded/files/85717886447.pdfIn PDF document text
    • http://urgentcarepb.com/userfiles/file/10941625781.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/madekepufimulikas.pdfIn PDF document text
    • http://hvezda-pardubice.cz/files/file/sejiduzomipiwediju.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_off0000e74c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE74C 19504 bytes
SHA-256: 0da2a0603138db3c13a6c8dea39fd48f68b6885d8fa2af0da90b7e96ff23c0f7
font_01_sfnt_off0001194e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1194E 10700 bytes
SHA-256: 70c5b454e572baa2ce1e2a2c4b64cc1785c3f35f39a3adf13f7c11cb716e1986
font_02_sfnt_off000131c9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131C9 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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