Malicious PDF — malware analysis report

Static analysis result for SHA-256 7ffe451089d11947…

MALICIOUS

PDF

70.1 KB Created: 2021-09-25 20:15:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 742f38649eeba1eefe8f34a1a69ee049 SHA-1: 0428ed5400446a5b7472cb9d2111ed8a57fda55d SHA-256: 7ffe451089d1194764aaf3c6d90251445ecaa97787a116d99b8b83afe881b4a9
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, with one specifically pointing to 'infrive.ru' and another being a link farm hosted on 'benthanhsgfarm.net'. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' strongly suggests the document's purpose is to host a collection of links, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the presence of embedded URLs and the nature of the link farm heuristic suggest potential for JavaScript execution or redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9965

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://infrive.ru/uplcv?utm_term=how+to+screen+share+my+phone+to+tv PDF link annotation
    • http://benthanhsgfarm.net/images/uploads/files/89492573134.pdfIn PDF document text
    • https://hrmconsulting.biz/upload/files/7652322304.pdfIn PDF document text
    • http://cuspsurgeons.com/userfiles/file/87922401417.pdfIn PDF document text
    • http://styrexon.cz/userfiles/file/85703046241.pdfIn PDF document text
    • https://emotionalgift.com/ckfinder/userfiles/files/48272298325.pdfIn PDF document text
    • https://www.glasswindowequipment.com/wp-content/plugins/super-forms/uploads/php/files/0f8eb027b0f5e3492f5e1f42ae2347ea/22530113785.pdfIn PDF document text
    • http://ikkosushi.com/uploads/files/73898685247.pdfIn PDF document text
    • http://constantemails.com/userfiles/file/1632417299xebigitef.pdfIn PDF document text
    • http://architects-desk.com/uploadsfile/52931910499.pdfIn PDF document text
    • http://dulichtantai.com/files/uploaded/files/gujigojumelera.pdfIn PDF document text
    • https://campfun.myhost888.com/upload/ckeditor/files/60175353317.pdfIn PDF document text
    • http://hrjok.com/uploadfile/file/nopibimopoguwo.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/seref.pdfIn PDF document text
    • http://marklaliberte.com/fckupload/file/falagelap.pdfIn PDF document text
    • http://www.allatpatikapecs.hu/images/file/najexofujoxe.pdfIn PDF document text
    • https://immsac.pe/sgi_userfiles/userfiles/files/noturixiritebifotik.pdfIn PDF document text
    • http://lisaarkin.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/13278964861.pdfIn PDF document text
    • http://movitecnic.fr/ressource/site-image/files/39277656441.pdfIn PDF document text
    • http://italy-ex.com/images/blog/file/rexudovu.pdfIn PDF document text
    • http://konditsionery-zheleznodorozhnyi.ru/upload_picture/file/56730591209.pdfIn PDF document text
    • https://akdenizokullari.k12.tr/wp-content/plugins/super-forms/uploads/php/files/8iq7a8dvk7s9vrrft4lmpvuj1q/82612297104.pdfIn PDF document text
    • http://lesen-und-schenken.de/userfiles/files/47400434755.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_off0000afda.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDA 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c7f1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC7F1 10756 bytes
SHA-256: 04ed5239d464d6f180359f692d0bf4915731a3e85868624c2f2066b4dee877e6
font_02_sfnt_off0000e094.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE094 16752 bytes
SHA-256: e311243b1e1fe20dd15369bbde24ba9b38692076fb29078be10a6bd632232165

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