Malicious PDF — malware analysis report

Static analysis result for SHA-256 db531662e23c8f56…

MALICIOUS

PDF

77.8 KB Created: 2021-09-22 12:52:52 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: 7cfd57358e71fb985348a53e1c51c820 SHA-1: 9dd2e3b063b3698a321ce8de23d697f175c94a4b SHA-256: db531662e23c8f562477d6c97ffc19a54cb0f319e6b41b7c92dd2d6459f969bb
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and numerous external URIs, many of which point to a link farm hosted on disposable domains. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. The presence of embedded JavaScript suggests an attempt to execute malicious code within the user's browser or PDF reader.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

Heuristics 6

  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://chia4kids.ru/ckfinder/userfiles/files/85706497719.pdf In PDF document text
    • http://platcometals.com/images/file/20690781856.pdfIn PDF document text
    • https://ojazzdance.fr/userfiles/file/nariw.pdfIn PDF document text
    • http://www.sosonomo.com/ckfinder/userfiles/files/79580890095.pdfIn PDF document text
    • http://matonaklawfirm.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/pujadiran.pdfIn PDF document text
    • http://digifast.cz/userfiles/migofegosusozebu.pdfIn PDF document text
    • http://elskup.pl/images/assets/file/paxuwaxe.pdfIn PDF document text
    • http://tid.vn/upload/files/61712199643.pdfIn PDF document text
    • https://dennismaloney.ca/upload/editor/file/12839322040.pdfIn PDF document text
    • http://huonglonghotel.com/uploads/image/files/51085991753.pdfIn PDF document text
    • https://ctcitsupport.com/media/files/zevimososuxeju.pdfIn PDF document text
    • http://ibrahimalsada.com/pics/file/xijat.pdfIn PDF document text
    • https://thehouseproduction.net/file/likatopas.pdfIn PDF document text
    • http://khaskhaan.mn/uploads/userfiles/files/keredemawexebojugabefum.pdfIn PDF document text
    • http://canadianartistic.com/userfiles/file/sobamezutajo.pdfIn PDF document text
    • https://independentmusicleague.com/wp-content/plugins/super-forms/uploads/php/files/4334f9d7f971770f1ccc55cec7b9a866/3760265166.pdfIn PDF document text
    • http://remproekt-m.ru/admin/ckfinder/userfiles/files/pezekatadozonowebo.pdfIn PDF document text
    • http://czpohledavky.cz/userfiles/files/nubuzara.pdfIn PDF document text
    • http://np-laser.com/upload_fck/file/2021-9-5/20210905000152253608.pdfIn PDF document text
    • http://ieltsadd.ir/cache/fck_files/file/76828436413.pdfIn PDF document text
    • http://huzatfokozo.hu/editor_up/3841217808.pdfIn PDF document text
    • http://parbatsamajjapan.com/img/files/files/gazegiparoridovifipepug.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/202195447279416.pdfIn PDF document text
    • http://due.pt/js/ckfinder/userfiles/files/xidexuvunadarokexafovusoz.pdfIn PDF document text
    • https://vibingvibes.com/userfiles/files/lopefefixeker.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/Om9ozkHLxGw/uplcv?utm_term=watch+dragonball+super+dubPDF 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_off0000ce70.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCE70 10936 bytes
SHA-256: 4cc4e2eb4789d09e9ca051477b02d632c3250ebcda1890787e7cb401a1e0ab58
font_01_sfnt_off0000e759.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE759 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000ff6b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFF6B 16232 bytes
SHA-256: 31aee62bf4cca5fa93b01fc1883d55c77bf7403d0440c5cae400f32cd6637ae0