Malicious PDF — malware analysis report

Static analysis result for SHA-256 303ddf44e4d724c7…

MALICIOUS

PDF

71.1 KB Created: 2021-09-27 09:37:02 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 006d795a0cc6bd8d7679fb4718a28ced SHA-1: 126aacf57b12e99b59e3184efe136a2070fce8e3 SHA-256: 303ddf44e4d724c760fa2d89ca34279008b3c11ad6b4afb936facd7d3f7e8e34
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was detected as a malicious PDF by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs and is identified as a link farm on disposable hosting, suggesting it's used to redirect users to potentially malicious sites. The presence of embedded URLs further supports this attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9959

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://intertexmedical.com/userfiles/files/widewolikusajaviwemivuvu.pdf In PDF document text
    • https://aryaayur.com/wp-content/plugins/formcraft/file-upload/server/content/files/16146275e71cba---46113697309.pdfIn PDF document text
    • http://old.bgk-meshkova.com/ckeditor/ckfinder/userfiles/files/voguramukasevasafolix.pdfIn PDF document text
    • http://bellezaeimagen.com.mx/wp-content/plugins/formcraft/file-upload/server/content/files/16147d7e92527d---95415296479.pdfIn PDF document text
    • https://leifs-auto.dk/images/file/xukipinafujedekojafal.pdfIn PDF document text
    • http://phuketdriveschool.com/userfiles/file/wonunalota.pdfIn PDF document text
    • http://oguzlarotomatiksanziman.com/depo/sayfaresim/file/87132509780.pdfIn PDF document text
    • https://alpinashop.rudy-ra.com/files/49509300602.pdfIn PDF document text
    • http://deaprogettazioni.it/userfiles/files/tivepal.pdfIn PDF document text
    • http://antonio-pelella.eu/userfiles/files/15878135592.pdfIn PDF document text
    • https://palezieux.com/ckfinder/userfiles/files/tigokenikagipisazomu.pdfIn PDF document text
    • http://teplospectr.ru/images/files/59735632154.pdfIn PDF document text
    • https://lederstuehle-shop.de/ckfinder/userfiles/files/komufifumusivinena.pdfIn PDF document text
    • http://masan315.net/board/imagefile/file/44726885548.pdfIn PDF document text
    • http://marathon-gexin.com/Uploadfiles/files/najizenavapufavutede.pdfIn PDF document text
    • https://grouptm2.com/contents/files/59774041625.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/pekopunexuvetazanoxig.pdfIn PDF document text
    • http://www.multigacos.com/admin/uploaded/fck/file/33103173023.pdfIn PDF document text
    • http://yearbookplus.com/uploads/ckfinder/files/nolix.pdfIn PDF document text
    • https://heureka-cz.eu/files/34840956957.pdfIn PDF document text
    • http://benetalent.com/upload/files/94662605147.pdfIn PDF document text
    • https://zohopinler.com/calisma2/files/uploads/91416866151.pdfIn PDF document text
    • http://lsmtrontractor.com/upfiles/file/20210919213802.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=afinador+de+viol%C3%A3o+para+celular+androidPDF 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_off0000b1ab.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB1AB 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c9bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9BD 16968 bytes
SHA-256: e79a5ab4b1c58e1b42c2363804ea24c405a59e8c28d6bb0f9c5ded9e0beb916a
font_02_sfnt_off0000f457.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF457 10760 bytes
SHA-256: f36d410982bb5897f2f6b76d647dac4304f7394c3a98fbfd491b1f36accd5321

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