Malicious PDF — malware analysis report

Static analysis result for SHA-256 73a69a1b05b27af5…

MALICIOUS

PDF

84.0 KB Created: 2021-09-09 22:43:49 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: 882f1293102b8ca3ca585b186da44949 SHA-1: 4a946e5ec067e44df793ee112ac6565a8bdf65ee SHA-256: 73a69a1b05b27af5b70f1df019283fafe560665ab143ea100ffa693d87d70dd5
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript and multiple external URIs, indicating it is designed to redirect users to potentially malicious websites. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or malware delivery. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' further supports the malicious nature by identifying the PDF as a link farm on disposable hosting.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • 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.
  • 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://philabc.ru/uplcv?utm_term=latest+telugu+songs+2020 PDF link annotation
    • http://tomasmrazek.cz/userfiles/file/juwetumigiwejudi.pdfIn PDF document text
    • http://sbnjl.com/userfiles/files/fofevew.pdfIn PDF document text
    • http://vietsonplastic.com/uploads/userfiles/file/26707501487.pdfIn PDF document text
    • http://silver.jo/ckfinder/blanc/files/fizifafapowojuka.pdfIn PDF document text
    • http://wjvanderheidedienstverlening.nl/uploads/file/27583338604.pdfIn PDF document text
    • https://zd-zeta.com/uploads/files/202108312026071030.pdfIn PDF document text
    • http://pomelieagency.com/userfiles/files/52498242545.pdfIn PDF document text
    • http://makassitools.com/userfiles/file///somaxunogirijunoxajosifen.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/diludodudap.pdfIn PDF document text
    • http://www.sloepverhuur-debiesbosch.nl/upload/files/76920373368.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/iio0hgvhkdgaod2di8dimvsui3/budetugabi.pdfIn PDF document text
    • http://aliancegroup.su/wp-content/plugins/formcraft/file-upload/server/content/files/16139082aac689---95644267757.pdfIn PDF document text
    • https://cairparavel.ro/app/webroot/files/userfiles/files/mitoj.pdfIn PDF document text
    • https://soudurelausiere.ca/upload/editor/file/furax.pdfIn PDF document text
    • http://posicert.com/upload_fck/file/2021-9-5/20210905065835725563.pdfIn PDF document text
    • http://dogomanhnghia.com/uploads/files/96492368539.pdfIn PDF document text
    • http://yomamasushitogo.com/uploads/files/46961373584.pdfIn PDF document text
    • https://photopoligrafic.ru/ckfinder/userfiles/files/jefapi.pdfIn PDF document text
    • http://labotinnghia.com/img/files/sibewaxetutudafopobok.pdfIn PDF document text
    • http://inewbus.com/wp-content/plugins/super-forms/uploads/php/files/e3416ngjglmu604160pek330d7/70348178714.pdfIn PDF document text
    • http://youngshiny.com/userfiles/file/1631189331.pdfIn PDF document text
    • http://thuocnam.xyz/images/files/38586376375.pdfIn PDF document text
    • http://poiskvod.ru/images/file/petebirubupuwomelapadaja.pdfIn PDF document text
    • http://www.leads-bd.org/app/webroot/js/ckfinder/userfiles/files/gibokanokuru.pdfIn PDF document text
    • http://grgct.com/ckfinder/userfiles/files/betepewelixe.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_off0000e5a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE5A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000fdb3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFDB3 17444 bytes
SHA-256: 8c8092a22f3baef3d32c601f737acdcbd646c2933ecb40cfc8e6bcc8bbff1ce7
font_02_sfnt_off00012ab1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12AB1 10392 bytes
SHA-256: aca2fc18217c6094794139ee02710e348ab71276492bed52f5850427c9c24d62