Malicious PDF — malware analysis report

Static analysis result for SHA-256 b79266f73e623634…

MALICIOUS

PDF

72.5 KB Created: 2021-09-15 09:50:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 994677ba8dcb03be655693e787b06882 SHA-1: ccffc799f9e85b1ec5208d108b07bcafd3f49f1f SHA-256: b79266f73e6236340a80dd2efff8a0bea07ad128c5f81dbf8f6acb5587261e27
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ClamAV as Pdf.Phishing.Trojan and an ML classifier indicated a high probability of maliciousness. It contains numerous embedded URLs, many of which point to disposable hosting and are likely used for phishing or distributing further malware. The PDF structure itself appears to be a link farm, designed to redirect users to various external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

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://queure.ru/uplcv?utm_term=recyclerview+example+in+kotlin PDF link annotation
    • http://anhuizpyy.com/upload_fck/file/2021-9-10/20210910174354444530.pdfIn PDF document text
    • http://totoquynhhuong.com/upload/files/kapisejemumej.pdfIn PDF document text
    • http://baby-daycare.com/uploads/files/202109012337508570.pdfIn PDF document text
    • http://birons.net/wp-content/plugins/super-forms/uploads/php/files/648ab7dac63ea2b60d7b335c21a761aa/vebepalubom.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210909_DF41A0A1A0E51909.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/46634585160.pdfIn PDF document text
    • https://kham.vn/userfiles/file/sogabagesowesoxizibo.pdfIn PDF document text
    • http://botaierpharm.com/upload/files/pemafamalemimuk.pdfIn PDF document text
    • http://agro-partner.com/Image/files/lidimopikepewurufekuri.pdfIn PDF document text
    • http://aaz.sk/editor_uploads/files/58524694749.pdfIn PDF document text
    • https://podimercrm.com/img/files/70888935099.pdfIn PDF document text
    • http://nofatrans-int.com/userfiles/file/gasazikegabafofobawa.pdfIn PDF document text
    • https://tiemhoahaibara.com/data/dulieu/files/50458409896.pdfIn PDF document text
    • http://codienlanhminhquang.com/upload/files/kipiwot.pdfIn PDF document text
    • https://navoloki.mebel18.com/uploads/files/55501653494.pdfIn PDF document text
    • https://www.geya99.com/ckfinder/userfiles/files/famedavirudizefowapibud.pdfIn PDF document text
    • https://dascalita.ro/app/webroot/files/userfiles/files/lukukat.pdfIn PDF document text
    • http://icltindia.in/userfiles/file/verefetugesu.pdfIn PDF document text
    • https://czus-lukasa.sk/userfiles/file/jasajumelezipeduxaje.pdfIn PDF document text
    • https://office-agglo-larochelle.fr/userfiles/file/22166276782.pdfIn PDF document text
    • http://glassick.com/userfiles/file/faxakife.pdfIn PDF document text
    • http://iraneto.com/basefile/iranetocom/files/niwekuzoj.pdfIn PDF document text
    • http://tecs4.com/intranet/ckfinder/userfiles/files/74430750741.pdfIn PDF document text
    • http://pradakshinam.com/fck_uploads/file/10335527672.pdfIn PDF document text
    • http://www.heksan.com.pl/file/fabenixedogugojuzilu.pdfIn PDF document text
    • http://claudiamelchior.it/images/file/87101447615.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_off0000b761.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB761 10872 bytes
SHA-256: 23af57b80c2c3b7dfa492ef6d70895c90ce646783ab7bc9eb3752b2f857693f8
font_01_sfnt_off0000d08c.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD08C 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000e89e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE89E 16820 bytes
SHA-256: cf313d1de03a389307f4fe88689d68c703372dc419b2cf00dcbc909043e4283a

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