Malicious PDF — malware analysis report

Static analysis result for SHA-256 e5ca396ffbf54f89…

MALICIOUS

PDF

84.1 KB Created: 2021-09-16 05:24:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: e41a1cbb81e62ff5d16ad977390674e8 SHA-1: 2ed16bcdb0e49eadf5dfeb0ef1b83eecfb71d525 SHA-256: e5ca396ffbf54f89f3e622265a5d313ef2876019f43d29608eaac4cf2f180147
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document contains numerous links to disposable hosting, suggesting an attempt to obscure the true malicious destination. While no scripts were explicitly extracted, the presence of embedded URLs and the nature of the heuristics point towards 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://www.booster-p.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613942d42a14a---4219100580.pdf In PDF document text
    • http://entone.es/wp-content/plugins/super-forms/uploads/php/files/070800bd279a509896db55143b4f8365/refafufejok.pdfIn PDF document text
    • http://www.temaricerca.com/entry2013/admin/ckfinder/userfiles/files/jafunimidibogad.pdfIn PDF document text
    • https://mjrspot.com/fckimages/file/pexifi.pdfIn PDF document text
    • https://smwebtechnology.com/arishayurveda.com/userfiles/file/jinusu.pdfIn PDF document text
    • https://electroagro.es/pub/files/66538060395.pdfIn PDF document text
    • http://immopolignano.lu/images/bidoxegumonugeragoxiwuzux.pdfIn PDF document text
    • http://1night2day.com/ckupload/files/diwizituzifut.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/88788498722.pdfIn PDF document text
    • http://gomsuhoangminh.com/app/webroot/uploads/files/35344163042.pdfIn PDF document text
    • http://gdfsztal.com/uploadfile/files/pojitekijojefe.pdfIn PDF document text
    • http://sisparts.pl/zdjecia/fck/file/16385345724.pdfIn PDF document text
    • http://i-p-p-c.com/ckfinder/userfiles/files/63107410374.pdfIn PDF document text
    • http://czerwoneiczarne.pl/files/file/61475719502.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/velanatejanozolavuwane.pdfIn PDF document text
    • http://balashixa.inhome360.ru/admin/ckfinder/userfiles/files/botunuxadewipoxobejunepo.pdfIn PDF document text
    • http://ccforum.kr/uploads/file/1631640738.pdfIn PDF document text
    • http://muntepa.com/userfiles/files/jufedojukozuraped.pdfIn PDF document text
    • https://giant-nano.com/app/webroot/userfiles/files/femasepofesalusozokilo.pdfIn PDF document text
    • http://clinicaveterinariaalbese.eu/userfiles/files/62270116441.pdfIn PDF document text
    • https://alice-immo.com/userfiles/file/97347565506.pdfIn PDF document text
    • https://faktxeber.com/resimler/files/xubebuto.pdfIn PDF document text
    • https://peusch.lu/userfiles/files/kapesizoketoxelupu.pdfIn PDF document text
    • http://85560891.com/upfolder/e/files/20210912135205.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/BvfzZFkJO3s/uplcv?utm_term=android+play+store+gamesPDF 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_off0000e432.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE432 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fc49.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFC49 10828 bytes
SHA-256: 6506ce4e1962487dbba940215ea4855073ebf8c263cd3f275376f495bf85c25e
font_02_sfnt_off00011515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11515 17976 bytes
SHA-256: 4b9a7256894fb146f9a3bf13603ae5b05263a320024159d614edb4d93880a95b