Malicious PDF — malware analysis report

Static analysis result for SHA-256 f5f0abf9e5a5d8f5…

MALICIOUS

PDF

74.6 KB Created: 2021-09-10 17:25:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: c27c49b286a7afb5082e80cb1bc02e69 SHA-1: 4e8e379f94d33af9371bf7838aa6bcd5350bdf18 SHA-256: f5f0abf9e5a5d8f5d532a9d6c4133db79ee6dc12b45281fc881c22c205426bec
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1204.002 Malicious Link

The sample is a PDF containing embedded JavaScript, which is a common technique for exploiting PDF vulnerabilities or delivering malicious content. It also contains numerous external URIs, including one pointing to a raw IP address, suggesting it's part of a link farm designed to redirect users to malicious sites. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or malware distribution.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9840

Heuristics 7

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Clickable URI points to raw IP address medium PDF_URI_IP_LITERAL
    PDF contains a clickable HTTP(S) action whose host is a literal IPv4 address. Legitimate documents normally link to named domains; raw-IP destinations are common in disposable phishing and malware-delivery infrastructure.
  • 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.
  • Embedded JS stream low PDF_JS
    PDF references a /JS stream. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://pixomot.ru/uplcv?utm_term=high+speed+download+sites+movies PDF link annotation
    • https://tiguan-wiki.ru/file/15701917227.pdfIn PDF document text
    • http://www.artefuoricentro.it/js/lib/ckfinder/userfiles/files/96085873255.pdfIn PDF document text
    • http://sinocelltech.com/filespath/files/20210902184306.pdfIn PDF document text
    • https://drakbera.com/ckeditor/ckfinder/userfiles/files/vodudasedafesotilufor.pdfIn PDF document text
    • http://sahcarpets.com/userfiles/file/98577511029.pdfIn PDF document text
    • http://camel-republic.com/media/userfiles/files/48202371267.pdfIn PDF document text
    • https://artsketch.ru/wp-content/plugins/super-forms/uploads/php/files/1db6285c32069ec41b5a819db9d605f2/18645620018.pdfIn PDF document text
    • http://studiochiodo.eu/userfiles/files/32790174648.pdfIn PDF document text
    • https://stmpallet.com/ckfinder/userfiles/files/kuvir.pdfIn PDF document text
    • https://trickapotisk.cz/webpagebuilder/ckfinder/userfiles/files/pexosipanewizugewaxalu.pdfIn PDF document text
    • http://tajesink.com/Uploadfiles/files/posaravotanojizuxokusiw.pdfIn PDF document text
    • http://miyagi.chi-kara.net/Upload/files/35284921065.pdfIn PDF document text
    • http://phongkhamthienhoa.vn/images/files/minulapinokogoguwuvoti.pdfIn PDF document text
    • http://myrbacken.se/login/ckfinder/userfiles/files/wolusinopuno.pdfIn PDF document text
    • http://cleanking.net/userData/board/file/45622973780.pdfIn PDF document text
    • http://www.ebsjosepirosamaria.com/wp-content/plugins/formcraft/file-upload/server/content/files/161399c291901c---73206956380.pdfIn PDF document text
    • http://perfectionistpaintingnj.com/ckfinder/userfiles/files/60399093232.pdfIn PDF document text
    • http://beauty214.com/uploads/files/202109021858205854.pdfIn PDF document text
    • https://sudhirsachdevaclasses.com/ci/userfiles/files/83884966549.pdfIn PDF document text
    • http://bc-arman.kz/ckfinder/userfiles/files/42470663187.pdfIn PDF document text
    • http://www.childofafrica.org/media/userfiles/file/joritududeborubil.pdfIn PDF document text
    • http://185.33.116.145/~acus01/upload/files/viganifamoxarajuzirud.pdfPDF link annotation
    • http://fitsiluet.cz/data/file/37064098235.pdfIn PDF document text
    • https://mahanakhon.pacedev.com/ckupload/files/dovepewanetuxizasuvu.pdfIn PDF document text
    • http://christ-china.com/filespath/files/20210910182152.pdfIn PDF document text
    • http://rapet.hu/files/92855212140.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_off0000c049.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC049 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000d85b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD85B 16960 bytes
SHA-256: 475168f8997e294a1bae453d135b0c193e489af8e5b4d1325649d765c841d47e
font_02_sfnt_off0001040b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1040B 10884 bytes
SHA-256: 36017d59db1817198f7129b03248a472d126bd27df0c5c07a7806c5bc27d9eba

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