Malicious PDF — malware analysis report

Static analysis result for SHA-256 4ac8e51365621cce…

MALICIOUS

PDF

67.8 KB Created: 2021-09-10 14:08:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 82d25b5b7c7e1fa8659af7aa6e4591b3 SHA-1: 2f6fdddb961e069f24b9f63a2f9c4f6dbfdb705c SHA-256: 4ac8e51365621cce20ac91577d4490e6020f33a37811fda011c3365359856e7a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. The PDF contains numerous embedded URLs, many of which point to unknown or potentially malicious domains, suggesting a link farm designed to redirect users. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports this, indicating a tactic to obscure the true destination of the links. No scripts were extracted, but the overall structure points to a phishing or malware distribution attempt.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9966

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://kammerchor-lindau.com/file/23013319292.pdf In PDF document text
    • https://datawire.gr/files/files/49110938554.pdfIn PDF document text
    • https://dcimx.com/files/divazinimedumaju.pdfIn PDF document text
    • http://yonezawanet.jp/units/24250/zcycom/files/jafux.pdfIn PDF document text
    • https://italvaping.com/file/42501229573.pdfIn PDF document text
    • http://thenikharvconsultancy.com/userfiles/file/bofologixopajenar.pdfIn PDF document text
    • http://kokocurry.gm/userfiles/file/14115600052.pdfIn PDF document text
    • https://tranduongauto.com/app/webroot/files/images/pages/files/gufimurezimarokazam.pdfIn PDF document text
    • http://wangguanhardware.com/userfiles/file/dawizexe.pdfIn PDF document text
    • http://gyn-ordi.at/myPix/file/wudax.pdfIn PDF document text
    • http://www.jobsincrete.gr/images/_user_na/file/7754767057.pdfIn PDF document text
    • http://stellarp.com/userfiles/files/18891310638.pdfIn PDF document text
    • https://leunamgroup.com/wp-content/plugins/super-forms/uploads/php/files/dfc150f3cd1c6e7015bd00ab739d547d/wivenafusivevusuwez.pdfIn PDF document text
    • http://dezis.ru/uploads/files/gamosulesozukapa.pdfIn PDF document text
    • http://vigova.vn/Images_upload/files/81370792119.pdfIn PDF document text
    • http://tamker.hu/userfiles/file/namazunenizusipixa.pdfIn PDF document text
    • http://daegyung.kr/userfiles/file/20210906231220.pdfIn PDF document text
    • http://brainbond.ro/userfiles/file/rudireralarosajekotisi.pdfIn PDF document text
    • http://cheliabinsk.realxenon.ru/uploads/files/44934753826.pdfIn PDF document text
    • http://trustycctv.com/ckfinder/userfiles/files/xubetozexuligowutunil.pdfIn PDF document text
    • http://elrey-uslugi.ru/media/file/41019007361.pdfIn PDF document text
    • http://www.1000ena.com/wp-content/plugins/formcraft/file-upload/server/content/files/16131588153c95---vexov.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/PmAiG5ZyT-k/uplcv?utm_term=set+caller+tune+app+downloadPDF 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_off0000ad32.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAD32 14580 bytes
SHA-256: 96b19fc3a2387e7e8f9e35601d0e806aa94d90a69eadc7d12d288c4e419cbd20
font_01_sfnt_off0000d1d2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD1D2 10508 bytes
SHA-256: 75b7df4a8533601b6e38ad3ea97bcd8184e68f3eca8252d2071a35bda8eb8ddd
font_02_sfnt_off0000e9ef.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE9EF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.