Malicious PDF — malware analysis report

Static analysis result for SHA-256 952f22f568484ef6…

MALICIOUS

PDF

81.2 KB Created: 2021-09-17 20:26:27 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: e834fc2dbb3f669ce0953f23337a7cd6 SHA-1: 1b7f306fdaef56d12d4d61385edded0f03fe7bc8 SHA-256: 952f22f568484ef67c202324cec496f6feee7a59eabbc2143f852c0f66d20b75
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF file contains numerous embedded URLs, many of which point to disposable domains and are likely used for phishing or to redirect to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent. Although no scripts were explicitly extracted, the PDF structure and embedded URIs suggest it functions as a lure to external malicious sites, potentially leading to further exploitation.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9975

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://inwebjor.ru/uplcv?utm_term=skate+it+apk PDF link annotation
    • http://cukorbetegshop.hu/files/tifuwudefowapevimanolepo.pdfIn PDF document text
    • http://huyminhplastic.com/upload/files/86485743456.pdfIn PDF document text
    • https://damsindia.org/admin/uploads/file/87397165595.pdfIn PDF document text
    • http://www.vljainandco.com/userfiles/files/18173169116.pdfIn PDF document text
    • https://bravo-hk.com/userfiles/file/21987292727.pdfIn PDF document text
    • http://www.tecnologycenter.com/admin/uploaded/fck/file/somuwuzusekilemelewegide.pdfIn PDF document text
    • http://cesishotel.com/res/wysiwyg/file/57126096356.pdfIn PDF document text
    • http://kronospan-mofa-hungary.hu/editor_up/51686280835.pdfIn PDF document text
    • http://321eastern-thailand.com/userfiles/files/54294523306.pdfIn PDF document text
    • http://bjbtrh.com/files/pic/file/32207473591.pdfIn PDF document text
    • http://dabaizhongxue.com/upload_fck/file/2021-9-7/20210907164612473831.pdfIn PDF document text
    • http://linhkienhunganh.vn/luutru/files/zagofidaku.pdfIn PDF document text
    • http://test.uebersetzungen-nesselberger.de/wp-content/plugins/formcraft/file-upload/server/content/files/1613bb0e2e547d---negerizarijuwuf.pdfIn PDF document text
    • http://www.fsnn.se/wp-content/plugins/formcraft/file-upload/server/content/files/16144ab548664d---vafipugumijexijiwupi.pdfIn PDF document text
    • http://gjbbang.com/userData/board/file/dopoxidejet.pdfIn PDF document text
    • https://clarkfamilybuilders.com/home/clark/public_html/ckfinder/userfiles/files/nirudiwif.pdfIn PDF document text
    • http://biplano.eu/userfiles/files/82371056438.pdfIn PDF document text
    • http://bacsiha.com/public/ckfinder/userfiles/files/towaxezamimukodetukefozaf.pdfIn PDF document text
    • http://www.jokilaaksonratsastajat.fi/file/91607000656.pdfIn PDF document text
    • https://refakatci.net/userfiles/file/27195265837.pdfIn PDF document text
    • http://nowyhotelik.pl/userfiles/file/pejorafujo.pdfIn PDF document text
    • https://techinnsrl.com/writable/public/userfiles/file/kamewujo.pdfIn PDF document text
    • http://fishngrill.iorderfoods.com/uploads/files/fipejizojozu.pdfIn PDF document text
    • http://xn--80aagkbrca3apkgkee0a1bi.xn--p1ai/ckfinder/userfiles/files/suvefopaxebivasun.pdfIn PDF document text
    • https://htcpost.vn/vietpost.vn/img_content/file/segukag.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_off0000d3d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD3D7 19588 bytes
SHA-256: ee4a396736bd0d7e3d5d03770edbf4e73ff9ff16004794347ce2e4b7884fa42c
font_01_sfnt_off000107c3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x107C3 9872 bytes
SHA-256: 9c5d8382897ee9e9d8ebf7f883ee19c222f5ba23637f27856e23a173fc71884c
font_02_sfnt_off00011db1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11DB1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1