Malicious PDF — malware analysis report

Static analysis result for SHA-256 d5ec0d511595ed6b…

MALICIOUS

PDF

78.1 KB Created: 2021-09-20 16:29:26 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 0fe6421b81c83a3c1beaaecc249d036b SHA-1: 65ea7eb5922459623226a42ce5ab50a6b7661b8f SHA-256: d5ec0d511595ed6b4f79237eef0c35468896fed7f05345a91a3f47ad90d3c0d5
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier indicating maliciousness. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates the document is a link farm hosted on disposable domains, with numerous embedded URLs pointing to potentially malicious content. The presence of many external URIs suggests an attempt to redirect users to phishing or malware download sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9949

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://irlanc.ru/uplcv?utm_term=png+image+apk+download PDF link annotation
    • https://studioconcept-stand.com/fck_userfiles/file/pomipodaxoramotoba.pdfIn PDF document text
    • http://fredericjean.net/oplusco/file/68955030533.pdfIn PDF document text
    • http://www.commandinglife.com/wp-content/plugins/formcraft/file-upload/server/content/files/16137bc8bcff75---nukukasese.pdfIn PDF document text
    • https://moscreen.in/cmsfiles/file/xoduxonavo.pdfIn PDF document text
    • https://aromamarketing.md/img/files/wopugu.pdfIn PDF document text
    • http://thainightjob.com/ckfinder/userfiles/files/13944306186.pdfIn PDF document text
    • http://damosushipleasanthill.com/uploads/files/nagaxetiveva.pdfIn PDF document text
    • https://skywaynepal.com/userfiles/file/73677134033.pdfIn PDF document text
    • http://e-sportis.com/images/upload/romaxexilajidit.pdfIn PDF document text
    • http://parcroyale.hk/userfiles/55077774870.pdfIn PDF document text
    • http://naturestuff.nl/siteimages/file/56360480964.pdfIn PDF document text
    • https://cartolmania.it/file/xoxamiridapikapofilanoga.pdfIn PDF document text
    • http://vedepcuaem.com/luutru/files/44185253406.pdfIn PDF document text
    • https://habrit.tw/ckfinder/userfiles/files/barevesaje.pdfIn PDF document text
    • http://hoitruyengiaocodocvietnam.com/uploads/image/files/kesunabujuxetodagilepu.pdfIn PDF document text
    • http://jedwines.com/cmsCart/upload/file/19593823597.pdfIn PDF document text
    • http://bijverhoeven.nl/uploads/files/koradavifoze.pdfIn PDF document text
    • http://alacarte-husum.de/userfiles/file/5025229183.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/97340842466.pdfIn PDF document text
    • http://pphjako.pl/userfiles/file/garemuporug.pdfIn PDF document text
    • http://hhoasis.org/app/webroot/img/fck/file/76446861492.pdfIn PDF document text
    • https://istanajpdua.com/contents/files/ruvoxerunupixi.pdfIn PDF document text
    • http://sarahscupcakery.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613e0e10c070b---76894233621.pdfIn PDF document text
    • https://dacola.com/upload/files/2092339347.pdfIn PDF document text
    • http://hotdeals24x7.com/ci/userfiles/files/67701931693.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_off0000cae4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCAE4 10548 bytes
SHA-256: 275db24106d010eb195e8a440eeda8fbc7cc72de894fee8efb90e408eb42fe8f
font_01_sfnt_off0000e2b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE2B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000fac2.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFAC2 18420 bytes
SHA-256: 0fe0fba7ac4fb251f0f21b7a3885cf88254ca5f7aec5b552ac50b19349c2a139

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