Malicious PDF — malware analysis report

Static analysis result for SHA-256 f1e700d258f0a01e…

MALICIOUS

PDF

72.5 KB Created: 2021-09-20 09:48:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 0503022e1eccc81a1d8b59b5b003751b SHA-1: ab7fa2839e85462fc4937b9f5ff7b66b5785ace3 SHA-256: f1e700d258f0a01e0b462785f2404569116c0469483aca89e74f28f8293bc9ac
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by a machine learning classifier and ClamAV as malicious, indicating a phishing or trojan threat. It contains numerous embedded URLs, many of which are associated with link farms or disposable hosting, suggesting an attempt to redirect users to malicious sites. The presence of external URIs and the overall structure point towards a spearphishing attachment delivery method.

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://granitnet.hu/editor_up/dokazasafisuwolize.pdf In PDF document text
    • https://lakecountyoralsurgery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614719e845165---50704117049.pdfIn PDF document text
    • http://kvarkeno56.ru/userfiles/file/texosoz.pdfIn PDF document text
    • http://thegioichuyendong.info/app/webroot/upload/files/towakuzej.pdfIn PDF document text
    • http://emke.hu/uploads/ckfinder/userfiles/files/12350206862.pdfIn PDF document text
    • https://sportsht.com/userfiles/file/gejoguboriziji.pdfIn PDF document text
    • http://ricoconsultingattorney.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/92420657301.pdfIn PDF document text
    • https://giridhareye.org/ckfinder/userfiles/files/zasorazutekopogovasipa.pdfIn PDF document text
    • http://architettoseneca.com/userfiles/files/85529583558.pdfIn PDF document text
    • https://alquimia.in/admin/fckeditor/editorfile/79298340194.pdfIn PDF document text
    • http://juentai.com/userfiles/files/39569194147.pdfIn PDF document text
    • http://korea-labels.com/ckfinder/userfiles/files/fowunax.pdfIn PDF document text
    • http://nc2e.fr/wp-content/plugins/formcraft/file-upload/server/content/files/1614385a78340c---27979181631.pdfIn PDF document text
    • http://xn--hazrdner-r4a10d.com/alisveris/yollanan_resimler/file/kudizovajaxiturar.pdfIn PDF document text
    • https://onhimalayas.com/ckfinder/userfiles/files/gusod.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/zufabav.pdfIn PDF document text
    • https://cliniquemyo.com/userfiles/file/jinatuxotuzamefeladika.pdfIn PDF document text
    • http://veoguidecostarica.com/ci/userfiles/files/78238944369.pdfIn PDF document text
    • http://aftp.bg/userfiles/file/lumamumusojalozagogifupe.pdfIn PDF document text
    • http://trieuduong.com/images/Download/95743677822.pdfIn PDF document text
    • https://reha.bg/content/upload/file/lujidibaraxapupegijew.pdfIn PDF document text
    • http://xn--76-6kca8aqc6c.xn--p1ai/pic/userfile/mageb.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/S30rS-6n6vg/uplcv?utm_term=run+movie+torrentPDF 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_off0000b917.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB917 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d12e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD12E 10104 bytes
SHA-256: 625ce26083ec4d16f63c22e2c0ea75c597d384998d5a96cf052a7aa8fbb88db0
font_02_sfnt_off0000e7af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7AF 17320 bytes
SHA-256: b0d94390810a2cb3784e9e2444a1b47f005a0b9ce98e038640712ef92f8e757c

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