Malicious PDF — malware analysis report

Static analysis result for SHA-256 9c4442ef249710a4…

MALICIOUS

PDF

77.1 KB Created: 2021-09-19 05:34:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 5996939bf0b7148e74097de78b347d6c SHA-1: aadeed29f91cdb01deb2da224fd1f7a4569cbb7a SHA-256: 9c4442ef249710a4f85219f15584999bfb2bbe833aea3179df9144195162d486
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs that point to link farms, with many of them hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely to redirect users to phishing or malware sites. Although no scripts were directly extracted, the structure and URL patterns are consistent with a phishing lure designed to trick users into downloading further malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9976

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://www.enredmail.com/templates/files/idCliente_/file/fabaduwekopovuxi.pdf In PDF document text
    • http://manpukulivermore.com/uploads/files/49640518585.pdfIn PDF document text
    • http://secureyun.cn/uploadfile/file///2021091320335859.pdfIn PDF document text
    • http://1544-7419.net/upload/fckeditor/file/42887714531.pdfIn PDF document text
    • https://dol-rtknetwork.com/uploads/files/miwifimezoxaw.pdfIn PDF document text
    • http://ryanoomen.nl/uploadimages/files/dijaxumejolaxasezo.pdfIn PDF document text
    • https://inprovitargentina.com/ckfinder/userfiles/files/xamiberevufekajaf.pdfIn PDF document text
    • https://pinyardim.com/calisma2/files/uploads/takizodezanijoj.pdfIn PDF document text
    • https://studiecarriere.it/uploads/file/maxuketevi.pdfIn PDF document text
    • https://carlojans.com/cms/file/mosulivuja.pdfIn PDF document text
    • http://panda-es.tokyo/yamituki-n/uploads/files/dezusanuw.pdfIn PDF document text
    • http://emailreceptionist.net/userfiles/file/69806621163.pdfIn PDF document text
    • https://www.okcfarmersmarket.com/wp-content/plugins/super-forms/uploads/php/files/8ade247bc1b5a5849b730b793cc7a288/mulamis.pdfIn PDF document text
    • http://liweisteel.co.th/ckfinder/userfiles/files/vanegijafobutez.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/teganofapubanibisa.pdfIn PDF document text
    • https://eminencesolutions.in/resources/userfiles/file/kagejikupizuduf.pdfIn PDF document text
    • http://knshzj.com/CKEdit/upload/files/20786200565.pdfIn PDF document text
    • http://muasamhangmy.com/ckfinder/userfiles/files/nijilowore.pdfIn PDF document text
    • http://nagyberki.hu/sites/default/files/fck_uploads/file/20929578712.pdfIn PDF document text
    • http://epilia.com/upload/FCKEditorfile/42283852142.pdfIn PDF document text
    • https://newegys.egyseg.eu/ckfinder/userfiles/files/tobaxinafi.pdfIn PDF document text
    • http://labradory.pl/file/jolazadutorudakirezese.pdfIn PDF document text
    • http://askort.pl/Upload/file/bejumakefisu.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/YTWXjIUwRh0/uplcv?utm_term=assassin%27s+creed+free+android+game+downloadPDF 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_off0000c7d9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7D9 17684 bytes
SHA-256: cf6c4e76e8150ff1f34e33d1bb81e07cd77a51ee1784239e45cd85002e40f395
font_01_sfnt_off0000f56b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF56B 10824 bytes
SHA-256: 4a64c7b242035d46bfea78694eef5da49efdd03fd6f84bfb274f6ffad8ce26f3
font_02_sfnt_off00010e42.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E42 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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