Malicious PDF — malware analysis report

Static analysis result for SHA-256 05a5075f643e41a7…

MALICIOUS

PDF

82.7 KB Created: 2021-09-16 08:48:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-07
MD5: dac4ca2e67e588a3af4967e6e8c82a4c SHA-1: b4b82c350587b123298230842b30a9a751228f11 SHA-256: 05a5075f643e41a72971e3fe7737f74b31fe8935bd9165914f7b3c53b1d73671
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample is a PDF file flagged by ML classifiers and ClamAV as malicious. It contains embedded JavaScript, which is often used to exploit vulnerabilities or redirect users. The PDF also features a large number of URLs, many of which are hosted on disposable domains, indicating a potential phishing or credential harvesting attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9944

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://durimawar.com/contents/files/3398937207.pdf In PDF document text
    • http://tourister.kr/userfiles/file/36585594161.pdfIn PDF document text
    • http://ssss-sangam.com/userfiles/file/wituwatejetegareriz.pdfIn PDF document text
    • https://funbugs.ie/files/file/towalibenijupupadazuvifab.pdfIn PDF document text
    • http://eot.mn/uploads/userfiles/files/gixibuvisa.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/62316903417.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/kazalazimanekexudu.pdfIn PDF document text
    • http://shopcode.ru/uploads/file/3437880800.pdfIn PDF document text
    • http://ttfi.org/app/webroot/userfiles/file/95217392940.pdfIn PDF document text
    • http://flirdining.com/uploads/files/59830467512.pdfIn PDF document text
    • http://terapie-psi.ro/wp-content/plugins/formcraft/file-upload/server/content/files/1613f81720501b---rubidaxajagefutenokina.pdfIn PDF document text
    • http://www.mbk-montage.nl/ckfinder/userfiles/files/zumujomaradel.pdfIn PDF document text
    • http://t-eamplus.de/web/editor/files/guzebolito.pdfIn PDF document text
    • http://jingluo.net/uploadfiles/files/janarewimefogitugeputez.pdfIn PDF document text
    • http://maezawa-jidousha.com/js/upload/files/duripuwizu.pdfIn PDF document text
    • http://szyqjsj.com/UploadFile/file/20210902203900227.pdfIn PDF document text
    • http://golden-candies.ru/webroot/files/files/46205020834.pdfIn PDF document text
    • http://juentai.com/userfiles/files/xiwosak.pdfIn PDF document text
    • http://stardentalcare.org/userfiles/file/69115097262.pdfIn PDF document text
    • http://cl-metalparts.com/d/files/pikesarom.pdfIn PDF document text
    • http://sccsfz.org/upload/2021-09/rezaguvofirem.pdfIn PDF document text
    • http://www.sunarozlem.com.tr/wp-content/plugins/super-forms/uploads/php/files/n6he5e9h6to2cur4gidt263nq4/zikexik.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/Om9ozkHLxGw/uplcv?utm_term=android+studio+linux+mintPDF 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 4

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d49e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD49E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ecab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xECAB 1948 bytes
SHA-256: b033f7fcbcd390b2cb396fbb5f03ef01f7ca9afc151f9d9df21604321f961cfa
font_02_sfnt_off0000f5aa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF5AA 18716 bytes
SHA-256: 598190aa7f1bba7f6c6d28a36e856cc9789887135f1abf4784fe8554c39272b0
font_03_sfnt_off00012614.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12614 10300 bytes
SHA-256: 7a8717a2c95ba66318a7c8eccb00f1836a2803bb3c0b99b97b1639e38a3a740c

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