Malicious PDF — malware analysis report

Static analysis result for SHA-256 ef09be68a0a65286…

MALICIOUS

PDF

74.1 KB Created: 2021-09-10 10:45:59 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: f1a85705c99e23497010afe81304227a SHA-1: 80d254becc32f62f3fade695c37759e9a20e1129 SHA-256: ef09be68a0a652868be4b75614b43e7376a885e24b2be9bacd59be07d479a4e7
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links pointing to various domains, many of which are hosted on disposable or potentially compromised sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. Although no scripts were explicitly extracted, the PDF structure and numerous external links suggest an attempt to redirect the user to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

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 https://manpowernepal.net/ckfinder/userfiles/files/zasawapozawexedeluvudivu.pdf In PDF document text
    • https://gadesign52.com/uploads/files/202108312014244381.pdfIn PDF document text
    • http://www.elmundodelapiscina.com/ckfinder/userfiles/files/59019757803.pdfIn PDF document text
    • https://perfumes.dropship-tracking.com/userfiles/files/51569961292.pdfIn PDF document text
    • http://3dtechgroup.com/uploads/image/files/jipobeworir.pdfIn PDF document text
    • http://apartamentykunickiego.pl/architekci/public/upload/ckfinder/userfiles/files/88555325174.pdfIn PDF document text
    • https://skvacations.com/userfiles/file/mupoka.pdfIn PDF document text
    • http://hellnocancershow.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132c72f2b8d9---33172289117.pdfIn PDF document text
    • http://www.insight-assessment.com/ckfinder/userfiles/files/lutoxavabiwemo.pdfIn PDF document text
    • http://macierz-grodziec.org/files/file/51800001429.pdfIn PDF document text
    • http://www.donboscovizag.org/images/files/xoxirabutere.pdfIn PDF document text
    • http://hitplus.eu/userfiles/file/43485766409.pdfIn PDF document text
    • https://lingchuanfloor.com/app/webroot/userfiles/files/25497222237.pdfIn PDF document text
    • https://euronuts2009.ge/files/files/16982466889.pdfIn PDF document text
    • http://thekitchendesignstudio.org/uploads/files/68883594168.pdfIn PDF document text
    • http://mygotour.com/FileData/ckfinder/files/20210906_DCE7F45EFC5C3C47.pdfIn PDF document text
    • http://kleinschaden-expert.com/userfiles/file/26168327640.pdfIn PDF document text
    • http://mwbright.com/upload_fck/file/2021-9-7/20210907041930171497.pdfIn PDF document text
    • http://embeddedhr.com/ckfinder/userfiles/files/94869341717.pdfIn PDF document text
    • http://architettorobertafasola.eu/userfiles/files/natuzejununawakivewiwa.pdfIn PDF document text
    • http://rydelko.pl/userfiles/file/tekenajemudavidatapeto.pdfIn PDF document text
    • http://madiagranitosilano.it/userfiles/files/54001378437.pdfIn PDF document text
    • https://aslplastic.com/ckfinder/userfiles/files/buralala.pdfIn PDF document text
    • http://dobrejaja.com/Upload/file/33040824632.pdfIn PDF document text
    • http://mutitar.com/user_img/files/26731093118.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/PmAiG5ZyT-k/uplcv?utm_term=megumin+live+wallpaperPDF 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_off0000bde8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xBDE8 17500 bytes
SHA-256: def6915a5145ada51c8f98afb631bff07c49cd02e5489331701b215ff65ba5d8
font_01_sfnt_off0000eb72.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB72 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010389.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10389 10452 bytes
SHA-256: b366624c57ab3918d80e7a82f52344e6c9630231bcf51534d961ef4a718b2bb9