Malicious PDF — malware analysis report

Static analysis result for SHA-256 cc23b71506623a9a…

MALICIOUS

PDF

87.0 KB Created: 2021-10-12 23:04:28 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-24
MD5: 7be6332c920320e3729d22d396dd6a5c SHA-1: d769cdb90405051708da241621b608651f4f2396 SHA-256: cc23b71506623a9ae49be1a83155ffae47d1f0abbe4252a1d6eabb8c7556609a
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by ML classifiers and ClamAV as malicious, specifically as a phishing trojan. Heuristics indicate it functions as a link farm, directing users to numerous external URLs, one of which is `https://nomylo.ru/uplcv?utm_term=a+god+of+small+things+pdf`. The presence of embedded URLs and the nature of the heuristics suggest an attempt to redirect users to potentially malicious sites for phishing or malware delivery.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9948

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://nomylo.ru/uplcv?utm_term=a+god+of+small+things+pdf PDF link annotation
    • http://traslochimontalto.it/userfiles/files/64900818258.pdfIn PDF document text
    • https://rayvoltbike.tw/geektic/files/97213807248.pdfIn PDF document text
    • http://weifong.tw/fckimages/file/22575651246.pdfIn PDF document text
    • http://arrhythmiaclinic.com/userfiles/file/20210927121945.pdfIn PDF document text
    • https://vaitinhdien.com/app/webroot/upload/files/57357862506.pdfIn PDF document text
    • http://langeline.com/ckeditor/upload/files/balawokupumazazoge.pdfIn PDF document text
    • http://artpolyclinic.com/file/files/39015177716.pdfIn PDF document text
    • https://ph2020.org/ckfinder/userfiles/files/siwexolarokotelusa.pdfIn PDF document text
    • http://okna-stv.ru/userfiles/files/56692178120.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/kasebulidogepupabimiw.pdfIn PDF document text
    • http://fluitec.fr/ressource/site-image/files/vajoxekixurad.pdfIn PDF document text
    • https://dsverano.com/UserFiles/File/kuwud.pdfIn PDF document text
    • http://anhuifan.com/upload_fck/file/2021-9-4/20210904104649255708.pdfIn PDF document text
    • http://ottomaniantextile.com/userfiles/file/vamas.pdfIn PDF document text
    • http://dichvugiayphep.net/hinhanh_fckeditor/file/25675043540.pdfIn PDF document text
    • http://linpus.com/app/webroot/userfiles/files/64961100081.pdfIn PDF document text
    • https://www.numberoneporthill.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1613866ab1b796---nabukevagixurudatovojorik.pdfIn PDF document text
    • http://kpdb.org/userfiles/files/52277542588.pdfIn PDF document text
    • https://dreamscapes.ca/dream_scapes/userfiles/files/narelukodifemujupenatul.pdfIn PDF document text
    • http://rund-sro.cz/UserFiles/File/3244675753.pdfIn PDF document text
    • http://lavalnerina.com/userfiles/file/wagodonasuxi.pdfIn PDF document text
    • https://hse.tw/upload/file/xeromimejaxijosije.pdfIn PDF document text
    • http://jyjjapan.jp/files/ckeditor/files/88051037727.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_off0000ea8a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEA8A 19928 bytes
SHA-256: bb94c4cf70cd2c0d969b556d9c2d6375f665403de6f5d35050e52bbc16db5d1f
font_01_sfnt_off00011e9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11E9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000136b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x136B6 10696 bytes
SHA-256: 79c10f32f810036942b465ebb9ed8d9ee8dbaaeff9a4c1a77a478ca27d3a69fb

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