Malicious PDF — malware analysis report

Static analysis result for SHA-256 57fe252c0aede0bf…

MALICIOUS

PDF

85.8 KB Created: 2021-09-21 07:44:14 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 77b56c61ebd92fe722170bac38ba3bf9 SHA-1: 51ea49e1789fd114cab217bdbf0337baadafc828 SHA-256: 57fe252c0aede0bfe2220dde17eb8bfbda6f079f80d9104a09523f7a693b49b5
174 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and a high number of external URIs, many of which are hosted on disposable domains, indicating a link farm. The 'SE_PASSWORD_ARCHIVE_LURE' heuristic suggests the document's purpose is to trick users into downloading a password-protected archive, a common tactic for evading gateway scanning. The ML classifier and ClamAV detection strongly indicate malicious intent, likely related to phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Password-protected archive handoff high SE_PASSWORD_ARCHIVE_LURE
    Document gives password instructions for an archive or attachment — often used to keep payloads encrypted until after gateway scanning
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://graviroz.hu/ckfinder/userfiles/files/12285901459.pdf In PDF document text
    • https://rajatotogroup4.com/contents/files/31378399398.pdfIn PDF document text
    • https://cdmsig.com/ckfinder/userfiles/files/47148510772.pdfIn PDF document text
    • http://bakoca.hu/files/file/xudapuzobotoziwi.pdfIn PDF document text
    • https://floraplant.gr/FCKeditor/userimages/file/93342615841.pdfIn PDF document text
    • http://al-bandak.com/userfiles/file/butekol.pdfIn PDF document text
    • https://www.educazionesessuale-scuola.ch/ck/ckfinder/userfiles/files/87534053374.pdfIn PDF document text
    • https://delaneyllc.cfonewsletter.com/ckfinder/userfiles/files/44867624376.pdfIn PDF document text
    • http://platypusspot.org/uploads/ckfinder/userfiles/files/50849025347.pdfIn PDF document text
    • http://mamolenasnc.it/userfiles/files/47056795269.pdfIn PDF document text
    • https://microfocus-realize2020mea.com/wp-content/plugins/super-forms/uploads/php/files/2509e9902ef92baa1697d4a7f42872d9/xamevit.pdfIn PDF document text
    • http://homokkepek.hu/editor_up/pugabegorobirixuvijosebus.pdfIn PDF document text
    • https://egyediajandekotletek.hu/mvc/userfiles/file/15654427302.pdfIn PDF document text
    • https://wroclawmodelshow.pl/ckfinder/userfiles/files/37017762005.pdfIn PDF document text
    • http://stihoplet.by/upload/editor/files/42277231903.pdfIn PDF document text
    • http://lactopad.com/uploads/files/lidulisugab.pdfIn PDF document text
    • https://aquatrustfina.com/userfiles/file/50741570837.pdfIn PDF document text
    • http://driver-jazda.pl/upload/file/risod.pdfIn PDF document text
    • http://tevukasveza.lt/ckfinder/userfiles/files/poveramesiwubajar.pdfIn PDF document text
    • http://video-cycling.de/files/file/92091860822.pdfIn PDF document text
    • https://megacook.pt/site/upload/file/91973746466.pdfIn PDF document text
    • https://cvzona.lt/resources/img/files/rixezevuvuxeneto.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/fzgW7-mxBc0/uplcv?utm_term=madness+combat+websitePDF link annotation
    • http://www.cst.rnu.tn/js/ckfinder/userfiles/files/67345704415.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_off0000ec9e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEC9E 10604 bytes
SHA-256: 90095e083517958f07ea839df1caa7ae02ba4aa43045eb96e13dc1361cc886e0
font_01_sfnt_off000104e0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x104E0 17196 bytes
SHA-256: c704aa40419c0c697ead40e3501f0c41687fbc8c0f7b79f4e4b784bc2aade87e
font_02_sfnt_off000131a2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x131A2 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1