Malicious PDF — malware analysis report

Static analysis result for SHA-256 31e56cc37dd76b84…

MALICIOUS

PDF

85.0 KB Created: 2021-09-20 04:53:40 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: e3a52fdcc55b8d19fa93ca3b13c54e45 SHA-1: c55f05a104bd0f6db5eb9a96f438a3f17164bfb0 SHA-256: 31e56cc37dd76b846f8ec9930456419849111be7b7d069e1f5a17ffe9fd9504d
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The file was detected by ClamAV as Pdf.Phishing.Trojan and flagged by an ML classifier, indicating malicious intent. The PDF contains numerous embedded links to external PDF files, suggesting a link farm or redirection mechanism. The presence of a 'download button' heuristic further supports a phishing or social engineering attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://pribatu.lamilagrosaimport.com/images/files/43456806510.pdf In PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/wesuzabelapirukubaf.pdfIn PDF document text
    • http://traktorpulling.de/ablage/userfiles/files/92432138437.pdfIn PDF document text
    • https://reniuved.it/file/20167246987.pdfIn PDF document text
    • http://www.village-gaulois.org/gestion/ckfinder/userfiles/files/zulidaripawovoxaponoxosi.pdfIn PDF document text
    • http://studiotecnicobonoli.com/userfiles/files/nawekagupafumesakevalo.pdfIn PDF document text
    • http://ducnhua.com/upload/files/litiguf.pdfIn PDF document text
    • http://wjcopy.com/upload/files/95672341538.pdfIn PDF document text
    • http://terezszilvia.com/images/uploaded/file/legulinovezarenawovo.pdfIn PDF document text
    • http://www.casasemio.com.br/ckfinder/userfiles/files/zanumiwipejubar.pdfIn PDF document text
    • http://mamnonsaokhue.vn/app/webroot/files/ckfinder/files/nitanerukaweve.pdfIn PDF document text
    • https://2b3la571ga-70p.com/contents/files/duwapekajalikogomuton.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/62385418178.pdfIn PDF document text
    • https://activsport.ro/userfiles/file/zenelako.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/porap.pdfIn PDF document text
    • https://akrmedia.no/ckfinder/userfiles/files/83783520692.pdfIn PDF document text
    • https://maharajganjtimes.com/assets/ckfinder/core/connector/php/uploads/files/mamugozujeluxusi.pdfIn PDF document text
    • http://plantessentialoil.com/upload/files/70512900915.pdfIn PDF document text
    • http://www.oe.com.tw/ezadmin/ckfinder/userfiles/files/22280068060.pdfIn PDF document text
    • http://www.oschouston.com/osc/wp-content/plugins/formcraft/file-upload/server/content/files/16137c3fbafe45---24860788363.pdfIn PDF document text
    • http://sanitaerprofi.ch/fckeditor/editor/images/file/91144574362.pdfIn PDF document text
    • http://ladispensadicampagna.it/uploads/assets/file/nuvap.pdfIn PDF document text
    • http://highdesertrent.com/newsite/images/uploads/file/66588542024.pdfIn PDF document text
    • https://bbpartner.cz/userfiles/file/vuzewu.pdfIn PDF document text
    • http://www.vinoplaza.nl/img/upload/files/losijixijoto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=best+likes+mod+apkPDF 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_off0000e7f5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7F5 18260 bytes
SHA-256: 6a3cb0fe843e605bb167f70dc4a38245dc3fa00734e63e280c36367a88a76124
font_01_sfnt_off000116d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x116D9 10496 bytes
SHA-256: 95d47830721cc707b6be1595428ba4443928c6a709410dfe9d3e9515d697f9cc
font_02_sfnt_off00012ec5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12EC5 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1