Malicious PDF — malware analysis report

Static analysis result for SHA-256 d8a9a6ae95dc78ac…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 01:11:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-20
MD5: 204dbfdb057662ba7d949957cf7ebeed SHA-1: a6bdfd50736617585bdd90064be89a93c945f873 SHA-256: d8a9a6ae95dc78ac9251d9fb5172aa50ec3bbc41268f39f4bff01086edfec8f4
154 Risk Score

Malware Insights

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

This PDF document exhibits characteristics of a phishing lure, employing an image-only interface to conceal a clickable action that redirects to external URLs. The presence of embedded JavaScript and the ML classifier's high confidence score further indicate malicious intent. The document likely serves to download and execute a second-stage payload or direct users to a phishing site.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

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
  • Image-only document with action trigger (screenshot lure) medium PDF_IMAGE_LURE
    PDF has 1 image(s), only 0 text block(s), carries a click-outward action, and is only 68 KB — typical shape of a phishing lure where a full-page screenshot hides a clickable button that launches or submits to an attacker URL.
  • 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://allytemp.ru/uplcv?utm_term=canelo+vs+saunders+watch+online PDF link annotation
    • http://longchimvac.net/app/webroot/uploads/files/57997722769.pdfIn PDF document text
    • http://bantinnhadat.com/users/files/52508521531.pdfIn PDF document text
    • http://www.77ice.com/upload/files/nirikisenozimir.pdfIn PDF document text
    • http://xatrbio.com/userfiles/file/bamakojoxinowogikasusazu.pdfIn PDF document text
    • https://ngonluathan.vn/images/ckeditor/files/18000427967.pdfIn PDF document text
    • http://cuanhuaabshanquoc.vn/files/22643472747.pdfIn PDF document text
    • http://thietkewebbacninh.com/webroot/img/files/58780954558.pdfIn PDF document text
    • https://lawtutors.co.uk/js/ckfinder/userfiles/files/xejivazifokiforamexamife.pdfIn PDF document text
    • https://www.grandiosa.is/wp-content/plugins/super-forms/uploads/php/files/fpl6vrcu0g9c4juo3shk05bct4/rawobufesobomadoforewodis.pdfIn PDF document text
    • http://turskazka.ru/ckfinder/userfiles/files/52259345142.pdfIn PDF document text
    • http://www.mondzorgvesa-voorschoten.nl/wp-content/plugins/formcraft/file-upload/server/content/files/16146ea7f695ce---sukeko.pdfIn PDF document text
    • http://kfbma.org/files/fck/file/nuzima.pdfIn PDF document text
    • http://vejwun.cz/images/59772602084.pdfIn PDF document text
    • http://kadh.kr/bobod/upload/file/25422285348.pdfIn PDF document text
    • http://enricobarraco.com/files/tiwidikavudivowezakoz.pdfIn PDF document text
    • http://1night2daytour.com/ckupload/files/44321985413.pdfIn PDF document text
    • http://suliaok.com/v15/Upload/file/2021951334342263.pdfIn PDF document text
    • https://hanyauntuktesting.com/contents/files/12282441299.pdfIn PDF document text
    • https://bakwanudang.com/contents/files/41067964392.pdfIn PDF document text
    • http://bjqyms.com/filespath/files/20210906030954.pdfIn PDF document text
    • http://letresorellebio.it/userfiles/files/vabirimidewusewitezap.pdfIn PDF document text
    • https://www.jnvhardoi.org/ckfinder/userfiles/files/9068842455.pdfIn PDF document text
    • http://koszyczarek.pl/userfiles/file/virelodakupunuperebok.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_off0000b0b0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB0B0 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c8c7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC8C7 10752 bytes
SHA-256: 52266d355f36a4a605d450c7f60b8b6b2a347b382537457cab9d2623eb9d8674
font_02_sfnt_off0000e184.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE184 13816 bytes
SHA-256: f2a153c5b4ecfd8b74fc0fe4dbfedd1d5111eb2dc204660ff9eaff0bdf391468