Malicious PDF — malware analysis report

Static analysis result for SHA-256 4b3da68f7efc4859…

MALICIOUS

PDF

83.3 KB Created: 2021-09-11 16:15:18 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 4a07a0b1889c526fdc772c1099ee48dc SHA-1: a494a69fe6c098bc3c5415a6666b79789226b53d SHA-256: 4b3da68f7efc485905e604c6db6b8b164bf780b37307722bafa24dd07aa4edfe
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a phishing or trojan payload. It contains embedded JavaScript and numerous external URIs, many pointing to disposable domains, suggesting it functions as a link farm to distribute malicious content or phish for credentials. The presence of embedded JavaScript indicates an attempt to execute code within the user's browser.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9974

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • 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://smidgel.ru/uplcv?utm_term=john+wick+2014+full+movie+english PDF link annotation
    • https://loan-financial.com/wp-content/plugins/super-forms/uploads/php/files/e5fb199545185b7754ada7637ac1bb17/xetofiwebasuputukukakopeb.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/95161754922.pdfIn PDF document text
    • http://studiotipaldo.com/userfiles/files/basebusaxosagev.pdfIn PDF document text
    • https://basisnomor.com/contents/files/wibofoxawadixol.pdfIn PDF document text
    • http://alfavit.tv/userfiles/file/wifijexikukab.pdfIn PDF document text
    • http://twsl.mingann.info/upload/ckfinder_temp/files/20210910044450.pdfIn PDF document text
    • http://bestapp4u.com/admin/uploadedfiles/file/60330778454.pdfIn PDF document text
    • http://kqcme.yiaiwang.com.cn/upload/files/bazokexisapejesirur.pdfIn PDF document text
    • http://nppgursaraijhansi.in/ckfinder/userfiles/files/76335352097.pdfIn PDF document text
    • https://driftwoodcc.com/userfiles/files/suzadow.pdfIn PDF document text
    • http://www.juniorcollege.cl/ckfinder/userfiles/files/64176557238.pdfIn PDF document text
    • https://banderlogclub.ru/Files/file/vebakefujaruvozaxivatomuf.pdfIn PDF document text
    • http://ffarchitettura.it/userfiles/files/82727241200.pdfIn PDF document text
    • http://www.pro9apps.com/app/webroot/files/uploadimagesfile/navafaxuwep.pdfIn PDF document text
    • https://dafelia.com/files/41863638617.pdfIn PDF document text
    • http://nfraccon.org/userfiles/file/wukewakimufigumenofa.pdfIn PDF document text
    • http://jmvlpslimited.com/ci/userfiles/files/85713359250.pdfIn PDF document text
    • https://sensormaticltd.com/app/templates/js/ckfinder/userfiles/files/rotomufuniku.pdfIn PDF document text
    • http://yuemeism.com/uploadfiles/files/8971981828.pdfIn PDF document text
    • https://qfse.co/images/uploaded_files/ckfinder/files/1630558181_adfd47d574.pdfIn PDF document text
    • https://harpethvalleypto.org/wp-content/plugins/super-forms/uploads/php/files/1048dd1bead6c05d0538786aacdf6460/filotubigamuf.pdfIn PDF document text
    • https://alate.org/admin/fckeditor/editorfile/11968174091.pdfIn PDF document text
    • http://clinical-pain.com/pds/userfiles/files/pemovig.pdfIn PDF document text
    • http://sostrevalli.it/userfiles/files/63996402797.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_off0000da40.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDA40 11132 bytes
SHA-256: 59357c1bf4bf37445cf45a7da3d8cda6cd95fcdc6dbd056ca04ef05b577f16fd
font_01_sfnt_off0000f439.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF439 20528 bytes
SHA-256: 706b2ea5bdd5ea0c26cd5af39e53507cec7efe3c6877a9de0a3c5693f4eee6cc
font_02_sfnt_off0001271e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1271E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1