Malicious PDF — malware analysis report

Static analysis result for SHA-256 98c3b719b4ba33e3…

MALICIOUS

PDF

68.8 KB Created: 2021-09-16 13:37:06 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: e1bfd7899080b96ff8ab24b78f9f4fe4 SHA-1: 57d11a6bbb1f5255b4154ec6d7b23b9ddf3356ee SHA-256: 98c3b719b4ba33e3a75901fea5106886094d9bb490820106f0dc9c50f74a6b9d
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF document exhibits characteristics of a phishing lure, employing an image-only design with a clickable action to disguise a malicious link. The embedded JavaScript stream and numerous external URLs, many hosted on disposable domains, suggest an attempt to redirect users to malicious content or download further payloads. The ClamAV detection and ML classifier further support its malicious nature.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://pistant.ru/uplcv?utm_term=kamar+teri+left+right+hale+mp3+song+download PDF link annotation
    • http://raduzhniy.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613fd1fab2e66---navixege.pdfIn PDF document text
    • http://tufaghanafc.com/js/ckfinder/userfiles/files/19267079082.pdfIn PDF document text
    • http://paroissedementon.fr/upload/files/bejodenosozedavirukutanaf.pdfIn PDF document text
    • http://laihoawedding.com/app/webroot/upload/files/20139114483.pdfIn PDF document text
    • http://www.telsercom.com/wp-content/plugins/formcraft/file-upload/server/content/files/161323aec39dc2---52159087632.pdfIn PDF document text
    • http://tageedesign.com/ssmpt/documents/file/bivaxitiwosifose.pdfIn PDF document text
    • http://quangphong.vn/uploads/image/files/lafovafikam.pdfIn PDF document text
    • https://am-system.eu/ckfinder/userfiles/files/zalolokis.pdfIn PDF document text
    • http://kamakuralosgatos.com/uploads/files/3856065239.pdfIn PDF document text
    • https://tramtron.vn/uploads/files/files/wilis.pdfIn PDF document text
    • http://eventologia.com/userfiles/files/93173293570.pdfIn PDF document text
    • https://yapluka-services.fr/userfiles/file/tofuje.pdfIn PDF document text
    • http://larben.cz/media/images/upload/file/75296121595.pdfIn PDF document text
    • http://squash-fitness.cz/userfiles/file/18121258775.pdfIn PDF document text
    • https://digireg.gr/upload/tatuzofujezatofuzov.pdfIn PDF document text
    • http://www.polni.si/Images/files/73437599255.pdfIn PDF document text
    • http://cnzhongkui.com/fckeditor/editor/filemanager/connectors/php/uploads/file/05195316337.pdfIn PDF document text
    • https://gagiongvitgiong.com/ckfinder/userfiles/files/fitug.pdfIn PDF document text
    • http://tsutae-f.com/js/upload/files/51862966327.pdfIn PDF document text
    • http://eminenceinc.com/userfiles/file/vuxoda.pdfIn PDF document text
    • https://goldenlinejsc.com/userfiles/file/jetizefivosofitanidom.pdfIn PDF document text
    • https://autohausnschmidt.de/userfiles/file/24675982055.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_off0000afdc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAFDC 14248 bytes
SHA-256: 3232bd039e13ac8bf4b6c8eb8502b834cad6a18fbb9e1b00f5a82558677c1479
font_01_sfnt_off0000d379.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD379 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000eb90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEB90 11196 bytes
SHA-256: 45f3132a464ef25d54ae18816d9adbb55fc354f4ce93f5048dc39cd97f0a501c