Malicious PDF — malware analysis report

Static analysis result for SHA-256 426618d0ff39b9f6…

MALICIOUS

PDF

80.3 KB Created: 2021-09-17 04:08:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 515e19c3b2168d917ec54ee6c80f337f SHA-1: b2ff0eee3c514f689238e05b0a218b06b915d296 SHA-256: 426618d0ff39b9f65f09dfe644d93ce4bee5a4e8237c01c09439115313f7ed03
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF contains numerous external URIs and is flagged by ML and ClamAV as malicious, indicating a phishing or malware distribution attempt. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' suggests a large number of links pointing to disposable hosting, likely to obscure the true malicious destination. While no scripts were explicitly extracted, the nature of PDF exploits often involves embedded JavaScript to facilitate the redirection to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://cructi.ru/uplcv?utm_term=uninstall+app+updates+android PDF link annotation
    • http://azbuka-d.ru/ckfinder/userfiles/files/77048000239.pdfIn PDF document text
    • https://lockerova.eu/admin/upload/documents/8631856986.pdfIn PDF document text
    • https://szemvidito.hu/sfwkr/feltoltesek/Images/Image/bexakufiwetosigobonoz.pdfIn PDF document text
    • http://maxitelt.no/wp-content/plugins/formcraft/file-upload/server/content/files/1613f316693999---nikufabuzemoju.pdfIn PDF document text
    • http://sakurahoaanhdao.com/webroot/img/files/mawokexixuxipolovafojitul.pdfIn PDF document text
    • https://topinsolventa.ro/userfiles/file/25449012566.pdfIn PDF document text
    • https://burlingame.com/wysiwygfiles/file/77883358215.pdfIn PDF document text
    • http://61kidsclub.com/userfiles/file/8499580283.pdfIn PDF document text
    • http://www.bash.cl/media/file/buzovipulitifufipusezisi.pdfIn PDF document text
    • http://batterseataxi.com/survey/userfiles/files/89963412544.pdfIn PDF document text
    • https://biographiewerkstatt-singer.de/userfiles/file/miluk.pdfIn PDF document text
    • http://whitedwarf.ru/public/images/ckfinder/files/tefuvifinotugigakopapi.pdfIn PDF document text
    • https://retentionstudentexperience.com/wp-content/plugins/formcraft/file-upload/server/content/files/161314de9bf8f8---redufudilibesopirinu.pdfIn PDF document text
    • http://annassteen.com/ckfinder/userfiles/files/82828350646.pdfIn PDF document text
    • http://1utilaje.ro/mm/file/71803627023.pdfIn PDF document text
    • http://grimastone.ru/files/tidedizevagexofekaduwi.pdfIn PDF document text
    • https://tlproduct.com/userfiles/file/49908045241.pdfIn PDF document text
    • https://dynasty888.com/image/files/20210916_190457.pdfIn PDF document text
    • https://expobar.vn/app/webroot/files/images/pages/files/puzufotejonezobifoj.pdfIn PDF document text
    • http://mygiftltd.com/userfiles/file/jiluwalokajikurexifolutep.pdfIn PDF document text
    • http://artdental.hu/editor_up/30182152468.pdfIn PDF document text
    • http://fotostudiovaccari.it/userfiles/files/24210025516.pdfIn PDF document text
    • http://artepcb.com/upload/files/nipuw.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_off0000d531.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD531 10492 bytes
SHA-256: d5e2a59ce07bd6086892e41ce87b8e15a82829936bee83f41202d96b8dc6541e
font_01_sfnt_off0000ed22.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xED22 17932 bytes
SHA-256: 8ec35c47a6b805b6ccafebc23efc113e338dea7f508be954a91ceca265c87cbe
font_02_sfnt_off00011b6e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B6E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.