Malicious PDF — malware analysis report

Static analysis result for SHA-256 9733c82115797fa1…

MALICIOUS

PDF

72.1 KB Created: 2021-09-29 02:49:04 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 3adf74530365702fd286ca63c404e92c SHA-1: b68196432f386fe990d7b896e9c5818b869ad5f1 SHA-256: 9733c82115797fa1816ffd2b0480b67541745611232bc2e79a5c394408c1f81a
142 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The PDF contains embedded JavaScript and numerous external URIs, indicating an attempt to redirect the user to malicious websites. The 'PDF_SEO_DISPOSABLE_LINK_FARM' heuristic suggests a link farm on disposable hosting, reinforcing the phishing or malware distribution intent. The ML classifier and ClamAV detection strongly indicate malicious behavior.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9971

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
  • 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.
  • JavaScript action low 1 related finding PDF_JAVASCRIPT
    PDF contains a /JavaScript action. Generic JavaScript is common in benign forms; specific dangerous APIs are scored by separate rules.
  • 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://irlanc.ru/uplcv?utm_term=how+to+check+android+phone+gpu PDF link annotation
    • http://denis-lefebvre-services.com/fichiers/file/dozon.pdfIn PDF document text
    • http://opusbiz.kr/data/editor/file/150925070761318d2c5c301.pdfIn PDF document text
    • https://inprovitparaguay.com/ckfinder/userfiles/files/76930678539.pdfIn PDF document text
    • http://jawarakreasi.com/file/mimakid.pdfIn PDF document text
    • http://gaishachuukobuhin.com/js/upload/files/fonefumewavipexeniruv.pdfIn PDF document text
    • http://avision-italia.com/userfiles/files/77130341582.pdfIn PDF document text
    • http://belloverde.net/emailer/file/25757425575.pdfIn PDF document text
    • http://meubelenindex.nl/images/uploads/66601754475.pdfIn PDF document text
    • http://fundacjaproartis.pl/javascript/ckfinder/userfiles/files/39483953892.pdfIn PDF document text
    • http://nhadatv.com/webroot/img/files/tegoxetaxoxesoran.pdfIn PDF document text
    • https://girisimhaber.com/uploads/file/3918057363.pdfIn PDF document text
    • http://shopcloud.cloud/ckfinder/userfiles/files/37499036276.pdfIn PDF document text
    • http://ljjxmining.com/uploadfile/file///2021091216301022.pdfIn PDF document text
    • http://myxroad.net/upload/userfiles/file///72736044390.pdfIn PDF document text
    • https://travelsafeway.com/userfiles/file/61567022385.pdfIn PDF document text
    • http://lycee-elm.com/userfiles/file/77001187861.pdfIn PDF document text
    • https://mobilaide.com/upload/editor/file/zatiruguvopetikonepiv.pdfIn PDF document text
    • http://www.mostenpo.jp/userfiles/files/98374448594.pdfIn PDF document text
    • http://automyjka.pl/automyjka.pl/userfiles/file/75979323484.pdfIn PDF document text
    • http://belly.bpv.su/content/files/files/fipuv.pdfIn PDF document text
    • http://cellesekorea.com/ckupload/files/fatibudimod.pdfIn PDF document text
    • http://eia-edu.com/userfiles/file/1628541664.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/78f4e870b502865553d94f9906ce2543/59537705329.pdfIn PDF document text
    • http://j1medical.com/uploaded/file/20298259607.pdfIn PDF document text
    • https://ecosolar-energy.com/piceditor/file/74597248870.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_off0000b4a4.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB4A4 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ccb6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCCB6 17204 bytes
SHA-256: 9eb9787415839389b23368c67d58323dfda84accadaa21306301fcdde79a3972
font_02_sfnt_off0000f94d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF94D 10848 bytes
SHA-256: 1577b255a85fdc2f7f3b981ef38ae68dda0596ef83a250520406df7aac31f371