Malicious PDF — malware analysis report

Static analysis result for SHA-256 676d975eb737bef1…

MALICIOUS

PDF

85.5 KB Created: 2021-09-16 21:42:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 5edd9fb721379f1ce2e289ea049cd35d SHA-1: 3d1b9c2c8313563903235bb03a7d7885ff627007 SHA-256: 676d975eb737bef12fefb696fe2e055652d21ddd6b8aae025087bc3dcbf6533a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to disposable domains, a common tactic for phishing or distributing further malware. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic indicates a deliberate attempt to create a link farm on potentially untrusted hosting. ClamAV detection and ML classification strongly suggest malicious intent, likely related to phishing or malware delivery via the embedded links.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://allytemp.ru/uplcv?utm_term=hypercam+android+10 PDF link annotation
    • https://regiefranchet.fr/userfiles/files/48654334094.pdfIn PDF document text
    • https://27061010.com/uploads/files/202109090816378512.pdfIn PDF document text
    • http://longarmacademy.net/fckeditor/userfiles/file/24913355363.pdfIn PDF document text
    • http://mxag.com/upload/browse/file/kazexegumun.pdfIn PDF document text
    • https://diarch.in/WYSIWYGImage/file/sefunixawivil.pdfIn PDF document text
    • https://study-go.info/wp-content/plugins/super-forms/uploads/php/files/c16437283deeb58a86fad6fd6cd8f3a8/83918886122.pdfIn PDF document text
    • https://greenlandpark.com/uploads/files/vibukozeka.pdfIn PDF document text
    • https://torgradio.ru/new/files/file/paxuxulipadixabe.pdfIn PDF document text
    • http://biosafety.biz/ckfinder/userfiles/files/39427107119.pdfIn PDF document text
    • http://elard-group.com/ckfinder/userfiles/files/xifobi.pdfIn PDF document text
    • http://hacsbathtarntaran.org/~/userfiles/file/ninofokajezoroxumo.pdfIn PDF document text
    • https://www.dogandemir.av.tr/paketler/ckfinder/dosyalar/files/29684222133.pdfIn PDF document text
    • https://astoraccessories.com/uploads/ckfinder/files/10149835692.pdfIn PDF document text
    • http://xn----7sbbgprpk7biiq.xn--p1ai/admin/ckfinder/userfiles/files/7985531541.pdfIn PDF document text
    • https://istocdukkan.com/userfiles/files/tazijezifurutizadogaguxe.pdfIn PDF document text
    • http://drcleancenter.com/uploads/files/202109050622474654.pdfIn PDF document text
    • https://eric-parnes.com/ckfinder/userfiles/files/xanik.pdfIn PDF document text
    • http://aow.infogestnet.it/ckfinder/userfiles/files/88290805500.pdfIn PDF document text
    • https://aslimitada.com/userfiles/file/supix.pdfIn PDF document text
    • http://ch-bovi.com/upload/files/29101093257.pdfIn PDF document text
    • http://qdsenfeng.com/data/files/50925388620.pdfIn PDF document text
    • http://geology.ie/wp-content/plugins/formcraft/file-upload/server/content/files/16138655b89242---zakumaxizepixoluve.pdfIn PDF document text
    • http://korealabels.com/ckfinder/userfiles/files/4180309848.pdfIn PDF document text
    • http://massimosusto.eu/userfiles/files/15023159203.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_off0000e792.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE792 18720 bytes
SHA-256: b25d8139ed1e180f6733a023cf372b823257857e60a19f9bd21b3a5e41e2d116
font_01_sfnt_off000117fe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x117FE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00013015.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x13015 10644 bytes
SHA-256: a12db63ab529ca7a7047b7e88c6a112f55bb1cd5f4cba867daba790bb3a7a13d