Malicious PDF — malware analysis report

Static analysis result for SHA-256 38e6dceb4c22a756…

MALICIOUS

PDF

84.8 KB Created: 2021-09-12 23:24:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-14
MD5: 1565e0815af83bb73e1e960d385b6548 SHA-1: 36a7ec4840928f00eecc3f0e6a922a1ab3023fb3 SHA-256: 38e6dceb4c22a7568889730d97ae10a81b01d611ca97b27185640d7be79c4c1f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains a high number of embedded links, many pointing to potentially malicious domains, indicating a phishing or malware distribution attempt. The ML classifier and ClamAV detection strongly suggest malicious intent. While no scripts were directly extracted, the PDF structure and numerous external links are indicative of a malicious lure, likely intended to redirect users to exploit kits or phishing pages.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9951

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://learnrkb.jugalbandiresearch.com/ckfinder/userfiles/files/lotebutegesorewefu.pdf In PDF document text
    • http://dydlhx.com/upfiles/file///goguseriramadesene.pdfIn PDF document text
    • https://ngaa.org.au/application/third_party/ckfinder/userfiles/files/43914522979.pdfIn PDF document text
    • http://sperrincaravans.com/images/file/bokirokeremub.pdfIn PDF document text
    • https://vgi-vn.vn/app/webroot/img/files/keweponipu.pdfIn PDF document text
    • http://www.majbrno.cz/uploads/files/paginapumuvoniporede.pdfIn PDF document text
    • https://lose-weight.tw/upload/files/josebuzanovepezuz.pdfIn PDF document text
    • https://ipssecurityconsultants.com/ckfinder/userfiles/files/57939808779.pdfIn PDF document text
    • https://sangolongphuong.vn/longphuong/news/files/jakekime.pdfIn PDF document text
    • https://enville.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613c2932a99b1---lileze.pdfIn PDF document text
    • https://paymentor.nl/uploads/file/3126254904.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/jemanekoxivikapotabo.pdfIn PDF document text
    • http://humansharehouse.com/userData/board/file/10653001559.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910162326.pdfIn PDF document text
    • http://anindecor.pl/files/file/97007497580.pdfIn PDF document text
    • https://heureka-cz.eu/files/60660696480.pdfIn PDF document text
    • http://www.novosib-sport.ru/ckfinder/userfiles/files/febepizi.pdfIn PDF document text
    • http://clinicaveterinariabilancino.it/userfiles/files/wozugimutodavaf.pdfIn PDF document text
    • http://demkapi.com/resimler/files/wefonazu.pdfIn PDF document text
    • https://sharjahcements.com/images/bulk_images/files/dogijuxegoxavir.pdfIn PDF document text
    • http://liubeauty.com/luutru/files/34739190017.pdfIn PDF document text
    • http://www.training4thefuture.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613422020bbb9---daxuwiwepisusibofitenizi.pdfIn PDF document text
    • https://apz-arte.com/ckfinder/userfiles/files/pivemotax.pdfIn PDF document text
    • http://srtprogetti.eu/userfiles/files/44922308558.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=cleo+mod+menu+gta+saPDF 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_off0000de53.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE53 10532 bytes
SHA-256: 31531809c0edb4773688515768d9e12e3d138bf5361417311d5d63a9ff96cff3
font_01_sfnt_off0000f628.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF628 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00010e3a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10E3A 21508 bytes
SHA-256: 50a9ee6a9623b6d8e577399fa67f07064a0cca76968d204176c3b1af0f62725c