Malicious PDF — malware analysis report

Static analysis result for SHA-256 cd5ccbfd69b9b68a…

MALICIOUS

PDF

80.8 KB Created: 2021-09-10 23:59:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 2721afae9ead11892f0c625c5db8fb23 SHA-1: 31c3a04a265ca496b343e66f38a50b86647c8345 SHA-256: cd5ccbfd69b9b68a18be205e3bdaa32ca0b59ae557eb85d3fa888f4438dc23da
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. It contains numerous embedded URLs pointing to disposable domains, suggesting a link farm designed to redirect users to malicious sites. The heuristic PDF_SEO_DISPOSABLE_LINK_FARM specifically identifies this pattern, and the presence of external URIs further supports this. While no scripts were explicitly extracted, the nature of the embedded URLs and the detection names suggest a phishing or malware distribution scheme.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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://pistant.ru/uplcv?utm_term=how+to+mirror+from+my+phone+to+my+tv PDF link annotation
    • http://shannonlakeestates.org/fck_images/file/33860342735.pdfIn PDF document text
    • https://argentinaproduct.com/ckfinder/userfiles/files/penolosikifes.pdfIn PDF document text
    • http://3e3i.com/UserFiles/file///fifisezop.pdfIn PDF document text
    • https://linkevicius.com/upload/galery/file/18441718309.pdfIn PDF document text
    • https://fenicia.uy/fenicia.com.uy/uploads/files/tomiwojasalutowo.pdfIn PDF document text
    • https://manage3.realtourvision.com/rtv/ckfinder/userfiles/images/files/sogeritemazogiwaxu.pdfIn PDF document text
    • http://vagtteam.com/userfiles/Files/19020723128.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/10867379718.pdfIn PDF document text
    • http://btsoft.vn/uploads/files/60651832182.pdfIn PDF document text
    • http://www.gulbaharsigorta.com/contentData/file/20228221744.pdfIn PDF document text
    • http://templeton.sk/userfiles/file/96706421494.pdfIn PDF document text
    • https://www.barrau-philippe-sedeco.fr/ckfinder/userfiles/files/nusisaxutila.pdfIn PDF document text
    • http://xn--b1adbbbaeqjtsflbfms0e.xn--p1ai/pict/file/sidukaruwanuj.pdfIn PDF document text
    • http://dambi.pl/userfiles/file/novosileneto.pdfIn PDF document text
    • http://baaningdoi.com/file_media/file_image/file/lazizuparujuranedetos.pdfIn PDF document text
    • http://getampedmag.com/ckfinder/userfiles/files/xoxixewixixojojuwuzi.pdfIn PDF document text
    • https://prestinieurope.ch/userfiles/files/73243078204.pdfIn PDF document text
    • http://jcbcharpentebois.com/ressource/site-image/files/vitulebuwisutob.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/5320108970.pdfIn PDF document text
    • http://pressvaluation.net/FCKeditor/editor/filemanager/connectors/userfiles/file/19942819235.pdfIn PDF document text
    • https://hsdinstruments.nl/uploads/files/gejuvanako.pdfIn PDF document text
    • http://www.belladermeestetica.com.br/wp-content/plugins/formcraft/file-upload/server/content/files/1613238a2b8048---gorixoxulezazopuzololig.pdfIn PDF document text
    • http://dralituncer.net/userfiles/file/ximugina.pdfIn PDF document text
    • http://nage-z.com/ckfinder/userfiles/files/11347452698.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_off0000d821.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD821 10504 bytes
SHA-256: 32e6942b097539447ed0b86b53f45f78cf8307db1b9d1b25b040fb3f6bf1d9e8
font_01_sfnt_off0000efd4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEFD4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000107e6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107E6 17792 bytes
SHA-256: a85911e266ca691006f9a2d1d477f543fc1c762f77f8126bcae06ce1ba2006d7