Malicious PDF — malware analysis report

Static analysis result for SHA-256 5b6bc987857dceac…

MALICIOUS

PDF

77.3 KB Created: 2021-09-13 09:36:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-29
MD5: 5767757619b0419a4ba59554fbc3d48c SHA-1: cd5b40c183782b945d46eaa08dee7835921ad61d SHA-256: 5b6bc987857dceac5ecca9f7fc0acb2edcfe9ccc21e88917563e48925f8fff88
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs and is flagged as a link farm on disposable hosting, indicating a malicious intent to redirect users. ClamAV detection and ML classification further support its malicious nature. While no scripts were directly extracted, the structure suggests it's designed to lead users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9943

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://yung-shun.com/userfiles/file/84639965540.pdf In PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/99b1df3d4bf07d734ca1611497d5e49e/87912505739.pdfIn PDF document text
    • http://euroear.eu/ckfinder/userfiles/files/82803187352.pdfIn PDF document text
    • http://sochi-vitrazhi.ru/ckfinder/userfiles/files/810117669.pdfIn PDF document text
    • http://karaokejdi.com/ckfinder/core/connector/php/upload/files/jovitadatetatotu.pdfIn PDF document text
    • http://ttc-investco.com/img/files/rejifotozowozuvokikuvako.pdfIn PDF document text
    • https://xn--fct5g39pjpo.tw/upload/leakstop/files/1436403008.pdfIn PDF document text
    • http://diennuocdanang.com/uploads/image/files/96166526123.pdfIn PDF document text
    • http://vijyaiprismcrm.com/userfiles/files/titikininiwobamuvug.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/navanosesubudoto.pdfIn PDF document text
    • http://bastola.org/userfiles/file/tufexomusapijowusedimo.pdfIn PDF document text
    • http://djpress.pl/Image/files/zidusefijowuzugef.pdfIn PDF document text
    • https://tskrea.com/userfiles/file/515594384.pdfIn PDF document text
    • https://agrocare.ro/ckfinder/userfiles/files/jevanoxexefewonaximu.pdfIn PDF document text
    • http://kirks-pool.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ea1152e0a1---legakepobuza.pdfIn PDF document text
    • http://brucemayrockinstitute.com/assets/ckfinder/core/connector/php/uploads/files/24148806820.pdfIn PDF document text
    • http://kaies.net/upfiles/file/bikenarapuredutiguze.pdfIn PDF document text
    • https://cahayamimpi1.com/contents/files/vibafadowomajom.pdfIn PDF document text
    • https://pavillonwohlen.ch/userfiles/files/situworonoxosajugesa.pdfIn PDF document text
    • http://caratow.nl/userfiles/file/pikasep.pdfIn PDF document text
    • https://art-gallery.mn/uploads/files/gowubotoroguvet.pdfIn PDF document text
    • http://msdoubrava.cz/foto/images/file/kaxetuled.pdfIn PDF document text
    • https://almondzwealth.com/administrator/imagetemp/file/lapapepikubolusevijate.pdfIn PDF document text
    • http://iccarrentals.com/files/file/99322519035.pdfIn PDF document text
    • https://i-try.tw/upfile/files/2021/09/10/xigopipuw.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/zMnd8XtcwSM/uplcv?utm_term=space+launcher+simulator+mod+apkPDF 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_off0000c9c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC9C3 17160 bytes
SHA-256: 4ce306c074dc7d26504552b0de04eacf63ea392c5cf5a174c9d83e1e5a6f2d0e
font_01_sfnt_off0000f618.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF618 11044 bytes
SHA-256: 9981658a5457add0b81f1d083377d0284a5f4739792ca87c27ffde3419a8470d
font_02_sfnt_off00010f93.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F93 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1