Malicious PDF — malware analysis report

Static analysis result for SHA-256 e8115a7864952884…

MALICIOUS

PDF

67.6 KB Created: 2021-09-13 10:33:34 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: f8f5086497a23c7c87b0bc5d9d56b40a SHA-1: 1608b0c92d5161a3d9a82c2d1a30724d87d89362 SHA-256: e8115a78649528849934cf0fa3ea633939f1764c50bf48d1d02310a225622c73
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically flagged it as a link farm on disposable hosting. While no scripts were extracted, the presence of external URIs and the link farm characteristic suggest the document's purpose is to redirect users to potentially harmful websites, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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 http://siamsnail.com/media/userfiles/files/velekurujebo.pdf In PDF document text
    • http://fusen-es.info/yamituki-n/uploads/files/gegafijir.pdfIn PDF document text
    • http://top-rubber.com/admin/fckeditor/editor/filemanager/connectors/upload/file/14532058929.pdfIn PDF document text
    • http://agataklimowska.pl/userfiles/file/pojose.pdfIn PDF document text
    • https://rgcsmt.org/ckfinder/userfiles/files/supekuwexitasikajemile.pdfIn PDF document text
    • http://santamariamikado.com/uploads/files/70183542498.pdfIn PDF document text
    • http://vocal.bpv.su/content/files/files/99713770275.pdfIn PDF document text
    • http://yogaschoolofkerala.com/photos/editor/files/75098312796.pdfIn PDF document text
    • http://tmkb.org.tr/ckfinder/userfiles/files/77768745617.pdfIn PDF document text
    • https://grnca.org/img/files/files/pelapirikuvofemodisuwise.pdfIn PDF document text
    • http://riverside-plaza.com/upload/userfile/files/nugux.pdfIn PDF document text
    • https://textosl.com/upload/editor/file/48780316245.pdfIn PDF document text
    • http://feuerwehrobrigheim.de/upload/files/tidetizanarubapa.pdfIn PDF document text
    • http://videocycling.info/files/file/63868294301.pdfIn PDF document text
    • http://lutechmed.com/Images_upload/files/53926083085.pdfIn PDF document text
    • http://ipceurope.eu/assets/file/24044119781.pdfIn PDF document text
    • http://ainut.fi/userfiles/file/berajesenurexijizez.pdfIn PDF document text
    • http://ergakiland.ru/files/files/84379604631.pdfIn PDF document text
    • http://maulich.vn/attachment/files/pogem.pdfIn PDF document text
    • http://pactolous.hu/upload/file/4029162594.pdfIn PDF document text
    • https://ddshower.com/ckfinder/userfiles/files/pesuzalexakirolator.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/6naE_Nh8_CY/uplcv?utm_term=itop+vpn+apk+modPDF 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_off0000aeda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAEDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6F1 10124 bytes
SHA-256: 11c8211f98c3aaee175ab5ae52e772dba4ca8b534a974c696a5c683c407be49a
font_02_sfnt_off0000dd88.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD88 14320 bytes
SHA-256: 6987a4549ceca74c622611f9a16326f2bcdd67947bb8e7b5d9ddc28a1363f04f

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