Malicious PDF — malware analysis report

Static analysis result for SHA-256 ca33504e90780650…

MALICIOUS

PDF

72.6 KB Created: 2021-10-08 15:58:36 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 48bd98ed249152f19b7f9c3327d1d099 SHA-1: 87f5f5902719e24722c8ea739b467087409bdbab SHA-256: ca33504e9078065041382ec3e2a47de3ed0bd86410e6d5f7eb30adf87dd4006e
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests the document is designed to host numerous links on disposable domains, a common tactic for phishing or distributing further malware. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards an attack pattern involving redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

Heuristics 5

  • 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.
  • 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://ottopianos.nl/files/wigokoratujonozoro.pdf In PDF document text
    • http://boschvietnam.vn/files/usersfiles/files/65128477333.pdfIn PDF document text
    • http://khamtribacninh.com/images/files/53605630959.pdfIn PDF document text
    • http://zulassungsservice4you.de/bilder/file/sodifus.pdfIn PDF document text
    • https://vilnius.cvzona.lt/resources/img/files/nukezolasowo.pdfIn PDF document text
    • http://crystaltrade.hu/data/file/56450488662.pdfIn PDF document text
    • http://bsa.by/ckfinder/userfiles/files/44352166312.pdfIn PDF document text
    • http://alternativefitness.com.au/wp-content/plugins/formcraft/file-upload/server/content/files/1614afc9bb4ce0---17463541375.pdfIn PDF document text
    • http://rheinmotel.com/userfiles/file/90344435038.pdfIn PDF document text
    • https://ms01bet.net/contents/files/48207493158.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/lawedabiwulawodolid.pdfIn PDF document text
    • http://dongbanja.com/userData/ebizro_board/file/jawudowopateziguredo.pdfIn PDF document text
    • https://cardion.dk/gfx/fckimages/file/9673250440.pdfIn PDF document text
    • https://1000families.eu/userfiles/file/sizaw.pdfIn PDF document text
    • http://mentaplywood.com/images_upload/files/ronenalitoluwedofexefise.pdfIn PDF document text
    • https://phr4u.com/files/43248462865.pdfIn PDF document text
    • http://www.phonefixcomo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614f51a1765dc---zivorajirutateralusi.pdfIn PDF document text
    • http://hoaisonland.vn/upload/files/99589542789.pdfIn PDF document text
    • https://il-gusto.com/images/file/bunoda.pdfIn PDF document text
    • http://mikomisushiwc.com/uploads/files/pupeb.pdfIn PDF document text
    • http://giteduguedesboires.com/userfiles/file/tujar.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=who+uses+sign+languagePDF 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_off0000ba2f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBA2F 10280 bytes
SHA-256: b4970c2af982896c6aadbf073a5c912ee6eb1676620d5c0a383aa78fe3798a60
font_01_sfnt_off0000d14b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD14B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e95d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE95D 17024 bytes
SHA-256: e422d194a462c0d5ee7b9cab7777337dfcb1c98367ff424d8446ee9d5c9cadbc

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