Malicious PDF — malware analysis report

Static analysis result for SHA-256 e73b95563e121cd2…

MALICIOUS

PDF

82.5 KB Created: 2021-10-09 14:07:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 18c827b332a0b4c9d8cd65e2ec9def4e SHA-1: dd45219eab0d46f72d4595e0796284ead88894ec SHA-256: e73b95563e121cd28a5598763613fa944d2311fcb70a7831f793dbb72b30e920
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' indicates the document is designed to host numerous links on disposable domains, suggesting a phishing or malware distribution scheme. While no scripts were explicitly extracted, the PDF structure and numerous embedded URLs point towards an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

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 http://balone.net/_upload/file///34451251778.pdf In PDF document text
    • https://tourgardan.com/basefile/tourgardancom/files/bupumotulavaravona.pdfIn PDF document text
    • http://aa-nusd.jp/2599390486.pdfIn PDF document text
    • https://www.digitalsofts.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140797f638a3---23194494506.pdfIn PDF document text
    • https://www.pietri-automobiles.com/wp-content/plugins/super-forms/uploads/php/files/3o9tfhb450hokqcd27rgflkha3/jexemesijovexiki.pdfIn PDF document text
    • https://duproject.com/uploadEditor/files/27426755791.pdfIn PDF document text
    • http://jongauger.com/userfiles/file/zuxezefapixipexe.pdfIn PDF document text
    • http://www.frank-diagn.hu/userfiles/files/854596237.pdfIn PDF document text
    • http://massimobertoarchitetto.com/userfiles/files/zujonoziwukadoguwomenuz.pdfIn PDF document text
    • http://eros-arena-reutlingen.de/eros/userfiles/file/25571023007.pdfIn PDF document text
    • https://infiniteprospects.com/FCKeditor/file/13988117221.pdfIn PDF document text
    • https://www.pactforfamilies.org/ckfinder/userfiles/files/powuv.pdfIn PDF document text
    • https://inmasa.com/imatges/file/fekagixegibosopamitixe.pdfIn PDF document text
    • https://postele-z-masivu.sk/ckfinder/userfiles/files/61831724564.pdfIn PDF document text
    • http://ildongwire.com/userfiles/file/xejodaxujep.pdfIn PDF document text
    • http://geodavidepini.it/userfiles/files/94610507782.pdfIn PDF document text
    • http://dent-pro.cz/pic/file/89948461471.pdfIn PDF document text
    • https://hotelindigha.com/FCKeditor/file/50542243756.pdfIn PDF document text
    • https://tucarrorentacar.co/ckfinder/userfiles/files/61853944475.pdfIn PDF document text
    • http://dichvuhieuchuan.com/upload/files/51779621772.pdfIn PDF document text
    • https://aldaserwis.pl/ckfinder/userfiles/files/woregemibuga.pdfIn PDF document text
    • http://manchetenewsms.com.br/ckfinder/userfiles/files/zinenipitakisirirep.pdfIn PDF document text
    • http://nemeckystrakac.sk/editor_uploads/files/kevavopefidikezo.pdfIn PDF document text
    • http://soupworld.de/upload/file/tazakufoxutavaronur.pdfIn PDF document text
    • http://an-professional.ru/img/files/file/geves.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/3vuEKuznOb8/uplcv?utm_term=lymphatic+system+in+human+bodyPDF link annotation
    • 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_off0000dbdf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDBDF 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f3f6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF3F6 10944 bytes
SHA-256: a6458a277234fd211a75b3f6d83fe3b6b2d8ae0ee77677034d1426c7ec363104
font_02_sfnt_off00010cfa.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10CFA 18352 bytes
SHA-256: c1affa04d0fe357c182811357d859381c5b8ad11e1d1ce7465376695e1f7d33c