Malicious PDF — malware analysis report

Static analysis result for SHA-256 95b53580c4b4c803…

MALICIOUS

PDF

71.4 KB Created: 2021-09-15 01:44:07 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 87790bdf1509c37ab7a8b48c47ca56b1 SHA-1: 76746e4e44c587f5322b20d87c7e5bfb37ccfc1b SHA-256: 95b53580c4b4c803bfc8a0e12a2020520531825dc0fc98b8be58fe9b2fc28af0
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 disposable domains, indicating a link farm designed to obscure the final destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware. The embedded JavaScript is a common technique for initiating malicious actions within PDF documents.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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 https://crewmak.ru/uplcv?utm_term=android+tv+box+hardwarezone PDF link annotation
    • http://gapp.fr/medias/files/momedifilipagobuwefak.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/23238441785.pdfIn PDF document text
    • https://easy2ticket.com/upload/files/6692430221.pdfIn PDF document text
    • http://cornaredo.gattinonimondodivacanze.it/themes/userfiles/files/6722165338.pdfIn PDF document text
    • https://plasy.com/uploads/file/wofefobozejiwubanabumapev.pdfIn PDF document text
    • https://geneolock.com/locktactyuma/userfiles/file/92942270800.pdfIn PDF document text
    • http://stacjaregeneracja.pl/userfiles/file/2527228746.pdfIn PDF document text
    • http://escalierdurire.fr/ckfinder/userfiles/files/gimuvirexakuxukujawedozu.pdfIn PDF document text
    • http://abpaluso.com/upload/file/lomasulorobiv.pdfIn PDF document text
    • http://simp-q.ru/userfiles/file/defotevolisubutuborewu.pdfIn PDF document text
    • http://dogalakustik.com/depo/sayfaresim/file/waxinowewa.pdfIn PDF document text
    • https://kvgrup.com.ua/wp-content/plugins/formcraft/file-upload/server/content/files/161327d44952c2---dosidesesekesogagebomusu.pdfIn PDF document text
    • https://mercedesmazo.es/wp-content/plugins/formcraft/file-upload/server/content/files/161411445a3129---tedaruj.pdfIn PDF document text
    • http://tythb.cn/uploadfile/files/8186026852.pdfIn PDF document text
    • http://zerosquareonline.com/file/23639728494.pdfIn PDF document text
    • http://studiospazioambiente.it/userfiles/files/kifalukazegotad.pdfIn PDF document text
    • http://www.roosprommenschenckelfoundation.nl/ckfinder/files/files/newob.pdfIn PDF document text
    • http://arcenevents.nl/site/upload/files/zabavewudemon.pdfIn PDF document text
    • https://penmypoem.com/new/admin/uploadfiles/file/68182027347.pdfIn PDF document text
    • http://www.palmettoexpresslanes.com/system/js/back/ckfinder/userfiles/files/36371890584.pdfIn PDF document text
    • http://tyros-club.de/userfiles/file/14927855750.pdfIn PDF document text
    • http://ibshop.gr/uploads/_uploads/files/40813668055.pdfIn PDF document text
    • http://www.chp.pl/ckfinder/userfiles/files/dolepezozun.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_off0000b815.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB815 10564 bytes
SHA-256: 3fba3f7da92c642257fbeda67583c39338b1d3a3ba4281cd2fb65f310d077806
font_01_sfnt_off0000d03b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD03B 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e84d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE84D 15716 bytes
SHA-256: 39ed873947758c45534b6a3b8f53d19c0e11e33349e7b0c4be5825ad19e1ffc6