Malicious PDF — malware analysis report

Static analysis result for SHA-256 7f7cc909ce20631c…

MALICIOUS

PDF

68.3 KB Created: 2021-09-26 19:45:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: fd04681941a96afc0c0fab4ae2ad8053 SHA-1: ff684ab6571483874f003f05535d07877f34e5c2 SHA-256: 7f7cc909ce20631c3c64e4326f1f5a5662f45e37d8f71c010538db8e3a5daf4f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains numerous embedded URLs pointing to disposable domains, indicative of a link farm designed to host malicious content or phishing pages. Heuristics indicate it's a link farm on disposable hosting, and ClamAV detected it as a phishing trojan. While no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it's designed to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9957

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://inwebjor.ru/uplcv?utm_term=donna+tartt+the+secret+history+pdf PDF link annotation
    • https://messianic.live/wp-content/plugins/super-forms/uploads/php/files/22418c2a453bfbc352049b2e01175dfc/leteza.pdfIn PDF document text
    • http://108shiva.com/userfiles/file/In PDF document text
    • http://xn--80aikni6a0b.xn--p1ai/images/file/buxunoputazano.pdfIn PDF document text
    • http://pkynfe.net/userfiles/file/53817199909.pdfIn PDF document text
    • http://ansatrans.ru/admin/ckfinder/userfiles/files/31724178325.pdfIn PDF document text
    • https://hamzsabegi60szallo.hu/UserFiles/File/jisurolipobokunufudid.pdfIn PDF document text
    • https://sunnyrosesschool.com/userfiles/file/19144517477.pdfIn PDF document text
    • https://ijacr.net/assets_admin/ckfinder/core/connector/php/uploads/files/setifiboxexoduvagezebosef.pdfIn PDF document text
    • http://borisovhlebprom.by/var/upload/file/xirusoxadutenap.pdfIn PDF document text
    • http://saint-party.com/media/file/6074651285.pdfIn PDF document text
    • https://bold-iot.com/uploads/files/202109081727068344.pdfIn PDF document text
    • https://matraci.info/UserFiles/File/52780736870.pdfIn PDF document text
    • http://ziconiavip.com/uploadfck/file/38566525344.pdfIn PDF document text
    • https://www.auto-ecole-rive-droite.fr/ckfinder/userfiles/files/bolinagem.pdfIn PDF document text
    • http://ibnuaffan.com/ckfinder/userfiles/files/fezogawepafuduvidogukugo.pdfIn PDF document text
    • https://webbsoil.com/home/webb/public_html/ckfinder/userfiles/files/gorokusejudaporomepisag.pdfIn PDF document text
    • http://h-n-s.net/userfiles/file/14344408454.pdfIn PDF document text
    • http://osoboebludo.com/ckfinder/userfiles/files/62686487946.pdfIn PDF document text
    • http://montagnobozzone.it/userfiles/files/78310708103.pdfIn PDF document text
    • http://xn--90afqerdlt1f.xn--p1ai/admin/ckfinder/userfiles/files/vujolosanunujufokopototi.pdfIn PDF document text
    • http://taxfreepoint.com/file/10557567027.pdfIn PDF document text
    • https://regenerativetherapyforpain.com/wp-content/plugins/super-forms/uploads/php/files/1f58b53db2a824c2e735825d7006a98f/gisisodofazudobebetino.pdfIn PDF document text
    • https://houstoncoinclub.org/FCKeditor/file/wemofotu.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_off0000ad99.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD99 10784 bytes
SHA-256: 28556fd4bdd8f3a54d22733f7d47ceb8b67d49141835213c91b881220fbbef6f
font_01_sfnt_off0000c666.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC666 14896 bytes
SHA-256: 31b45db99d28aef8185da1d6e1614b785eb4077745842f4318e13bb8408cfea2
font_02_sfnt_off0000eb80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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