Malicious PDF — malware analysis report

Static analysis result for SHA-256 f62f1a0307ed59bd…

MALICIOUS

PDF

94.2 KB Created: 2021-09-16 20:58:29 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 3880b672aced62c99dcc16531699a3fc SHA-1: 3399734a4a5175b5c04b4aa79cd990f553eeeada SHA-256: f62f1a0307ed59bd2c6204571a9e31ceb66680b687ad4174da60f1e5bef05b60
66 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous external URLs, with one heuristic specifically identifying it as a link farm hosted on disposable domains. The ML classifier strongly indicates maliciousness. While no scripts were extracted, the presence of many external links suggests an attempt to redirect users to malicious sites, likely as part of a phishing or malware distribution campaign.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9820

Heuristics 4

  • 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://pistant.ru/uplcv?utm_term=redmi+note+8+pro+vr+mode PDF link annotation
    • http://metabolit.ru/files/file/31513107906.pdfIn PDF document text
    • http://khautrangkhangviet.com/upload/img/files/puwizobojigotupir.pdfIn PDF document text
    • https://tallerescarrion.com/uploads/file/69009110897.pdfIn PDF document text
    • http://a-mega.ua/images/uploads/file/45533796548.pdfIn PDF document text
    • https://ekoelprom.pl/public/images/editor/file/59985067736.pdfIn PDF document text
    • https://kidneystonetreatment.in/userfiles/files/lefikameda.pdfIn PDF document text
    • https://nada70.org/userfiles/file/10583489779.pdfIn PDF document text
    • http://form4concrete.ru/pics/cont/file/tizovizesujirigusavave.pdfIn PDF document text
    • http://ziepniekkalns.lv/wp-content/plugins/formcraft/file-upload/server/content/files/161351063c3c33---56478861607.pdfIn PDF document text
    • https://santa.sg/images/users/00000000/files/88272128516.pdfIn PDF document text
    • http://qtjdb.com/UploadFile/2021/09/12/file/20210912_035719_116.pdfIn PDF document text
    • http://lisaarkinlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/parutisudotufiz.pdfIn PDF document text
    • http://dpnovelty.com/upload/files/lumewomov.pdfIn PDF document text
    • https://textmakareknutsson.se/upload/image/filetalatibu.pdfIn PDF document text
    • http://kiddeefire.com/media/userfiles/files/49087220145.pdfIn PDF document text
    • http://maslatalaia.com/userfiles/file/55466195906.pdfIn PDF document text
    • https://kfmaccounting.com/webroot/img/content/files/rubowunavim.pdfIn PDF document text
    • http://americasbestwingspa.iorderfoods.com/uploads/files/49355598947.pdfIn PDF document text
    • http://okna-kurska.ru/page_edit/_samples/userfiles/files/86769304778.pdfIn PDF document text
    • http://taemyung.com/data/upload/file/98494634746.pdfIn PDF document text
    • http://startent.ru/SITE/files/editor/file/gunumizinojevef.pdfIn PDF document text
    • https://poldercuptrofee.nl/site/admin/ckfinder/userfilesfiles/56724358431.pdfIn PDF document text
    • https://www.sudoku-cool.com/ckfinder/userfiles/files/73965438740.pdfIn PDF document text
    • https://www.crossfitparamaribo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613ae766c1303---redugifitazejesudife.pdfIn PDF document text
    • https://piphoto.tw/uploads/files/202109120750081236.pdfIn PDF document text
    • http://globalfeedindustry.com/upload/files/tuwagamisajir.pdfIn PDF document text
    • 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_off0001015e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1015E 22300 bytes
SHA-256: 2ba6725dfde09486edd58bbbb1c81c3d105904d0a24e6ac097f97097a90e530c
font_01_sfnt_off00013b6f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13B6F 10496 bytes
SHA-256: 2bc3d7c735bb351d1ef7f558dfd858c244cd8eed26934f187fdaf53bfbfdb46a
font_02_sfnt_off00015345.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x15345 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1