Malicious PDF — malware analysis report

Static analysis result for SHA-256 d08e924bb06503ac…

MALICIOUS

PDF

82.5 KB Created: 2021-09-19 23:03:08 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: d2d3ad87298fe4897f9969a3db0433c8 SHA-1: 9f97e494b287d90139130c4e7f3ebe7085423fd9 SHA-256: d08e924bb06503acb5debf6559fdcca99e8c1efeee5eb10fc0cd21bf54b4eda2
134 Risk Score

Malware Insights

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

The PDF file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous embedded URLs, many of which point to disposable hosting and are part of a link farm designed to trick users into downloading further malware. The presence of a download button lure further supports this phishing-like attack pattern.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9955

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.
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • 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://laborke.ru/uplcv?utm_term=tamilrockers+new+tamil+movie+download PDF link annotation
    • https://assignmentmart.com/ckfinder/userfiles/files/23631977744.pdfIn PDF document text
    • https://kalitelivideoizle.com/resimler/files/bisitulobowawolivixuzuseg.pdfIn PDF document text
    • https://citronel.com/userfiles/files/puxuxapaxesujetesezefo.pdfIn PDF document text
    • http://for-rent-leuven.com/wp-content/plugins/formcraft/file-upload/server/content/files/161338d8dca370---nafusemo.pdfIn PDF document text
    • http://struttur-arch.it/userfiles/files/51645798338.pdfIn PDF document text
    • http://abwplazaview.com/uploads/files/fikape.pdfIn PDF document text
    • http://www.johnrealestate.in/ckeditor-ckfinder-integration/uploads/files/tozixepebejetudane.pdfIn PDF document text
    • http://tfh-filter.hu/_user/file/jemigitilewajikawuvewuv.pdfIn PDF document text
    • http://jncs.kr/page_data/file/20210906104848.pdfIn PDF document text
    • http://sbairs.com/datas/files/tometinufojosivuzekiw.pdfIn PDF document text
    • https://jamiatulbanat.in/wp-content/plugins/formcraft/file-upload/server/content/files/16145d6cbc1d92---tizutigosexoxolo.pdfIn PDF document text
    • http://thanuyentea.com/ckfinder/userfiles/files/26869529914.pdfIn PDF document text
    • https://pui-vital.ro/msg_media/file/40523815522.pdfIn PDF document text
    • https://nocnepal.org.np/ckfinder/userfiles/files/luparesutede.pdfIn PDF document text
    • https://dazhonghua1688.com/ckfinder/userfiles/files/62072344030.pdfIn PDF document text
    • http://agcslohian.com/userfiles/file/18920722980.pdfIn PDF document text
    • http://kkc1.org/htdocs/cljr/data/files/1650646683.pdfIn PDF document text
    • https://perfectsextherapy.com/public_html/userfiles/file/lavides.pdfIn PDF document text
    • https://adikkedua.com/contents/files/61167002599.pdfIn PDF document text
    • https://portugaliaimagyarok.com/ckfinder/userfiles/files/sotub.pdfIn PDF document text
    • https://makojudo.pl/zdjecia/fck/file/ronejomol.pdfIn PDF document text
    • http://www.patriarca-batiment.com/ressource/site-image/files/wanowodufuwogivulewagosag.pdfIn PDF document text
    • http://shsuorui.com/uploadfiles/fckeditor/20210910/file/16312999643759.pdfIn PDF document text
    • http://opakowania-loga.pl/zdjecia/fotki/file/5320425850.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_off0000de68.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE68 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f67f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF67F 10740 bytes
SHA-256: 24e84d8461b61302cb619ba7591ef9aaea2ba448b6e13d5ac300f0876299b51a
font_02_sfnt_off00010f39.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10F39 17944 bytes
SHA-256: 44f2b74c2de6d336ff027f25f9b8149cc19408446baec78384282a29c9c88c21