Malicious PDF — malware analysis report

Static analysis result for SHA-256 83354f7a578667a4…

MALICIOUS

PDF

75.8 KB Created: 2021-09-18 16:37:58 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 5bc0d8469fdda725509de6e465de19b3 SHA-1: 9ab982deedec403362aaf1ecd75d6ca14c3c6c4e SHA-256: 83354f7a578667a4adcc7098d096b3d393aa421c370abecd6760f5d2170ca15f
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous external URIs, many of which are part of a link farm, suggesting a phishing or malware distribution lure. The presence of embedded URLs and the PDF structure point towards an attempt to redirect users to potentially harmful content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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://huntic.ru/uplcv?utm_term=terraria+mobile+free+apk PDF link annotation
    • https://www.scmsgroup.org/ckfinder/userfiles/files/56525278370.pdfIn PDF document text
    • http://mrpennarak.com/user_file/file/23177857151.pdfIn PDF document text
    • https://highlander-inn.com/assets/userfiles/files/dobabadinaxidurirumel.pdfIn PDF document text
    • http://johnmichaelharrisonlaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/gunefofamu.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/genoturow.pdfIn PDF document text
    • http://worldwidestationeryholdings.com/files/file/nomojejik.pdfIn PDF document text
    • https://skywaytravelandholidays.com/ckfinder/userfiles/files/mizugupedojoxegitu.pdfIn PDF document text
    • https://samirkumarpaul.com/ckfinder/userfiles/files/lexasosof.pdfIn PDF document text
    • http://sinners-party.de/media/file/20365338020.pdfIn PDF document text
    • https://idd.no/ckfinder/userfiles/files/42506884876.pdfIn PDF document text
    • http://krishikhabar.net/assets/ckfinder/core/connector/php/uploads/files/kamodasorage.pdfIn PDF document text
    • http://domario.ru/userfiles/file/99806922936.pdfIn PDF document text
    • https://lordoptika.hu/files/files/22428981163.pdfIn PDF document text
    • http://around-sicily.net/userfiles/file/90557527942.pdfIn PDF document text
    • http://www.santamyoga.be/images/file/94409077714.pdfIn PDF document text
    • https://nordavril.com/userfiles/file/34036395778.pdfIn PDF document text
    • http://rockhouseschool.com/rockhouse/uploads/files/supelulat.pdfIn PDF document text
    • http://www.ncstarim.com.tr/wp-content/plugins/super-forms/uploads/php/files/lhc1ltce4ilvil3f9atklgkuh4/30711838779.pdfIn PDF document text
    • http://cuacuonductudong.com/upload/files/bokusezorejevubifogurip.pdfIn PDF document text
    • http://trans-serwis.com/userfiles/file/83638825942.pdfIn PDF document text
    • https://geloracinta.com/contents/files/zelos.pdfIn PDF document text
    • http://amoy-art.com/Upload/file/38664785055.pdfIn PDF document text
    • http://csc020.com/userfiles/file/20210918183624_vhgulw.pdfIn PDF document text
    • http://cinstech-inspect-survey.com/fckeditor_userfiles/file/46526268094.pdfIn PDF document text
    • http://zaintik.org/files/galeria/files/texefubaburobokofujuna.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_off0000c8ec.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8EC 10344 bytes
SHA-256: bc8468f8598a8cf99538239f89ca287abeaa30e25be7e087f4bbb64402e4b999
font_01_sfnt_off0000dffe.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDFFE 16164 bytes
SHA-256: 71cc9da1cddfca0e882bb7aab789f20c67a7e72be1c1fbb48f304b0bfae3c9ee
font_02_sfnt_off0001095a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1095A 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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