Malicious PDF — malware analysis report

Static analysis result for SHA-256 0fcfdd9cc09b4f18…

MALICIOUS

PDF

68.4 KB Created: 2021-10-01 06:27:20 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-26
MD5: ecc5dca03b4b23744c240d468168db4f SHA-1: a0aad4b3c0015f07e956a9f828f11550d3868e3f SHA-256: 0fcfdd9cc09b4f1850311f0124f15fad6ff678d9546a7e05b0ffa0d1b8bc5e9c
154 Risk Score

Malware Insights

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

This PDF document contains embedded JavaScript and is flagged by ML classifiers and ClamAV as malicious. The heuristics indicate it's an image-based lure designed to trick users into clicking external links, such as the one found pointing to 'https://laborke.ru/uplcv?utm_term=download+samurai+shodown+2+apk'. The embedded JavaScript likely facilitates the redirection or execution of a malicious payload.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9954

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://laborke.ru/uplcv?utm_term=download+samurai+shodown+2+apk PDF link annotation
    • http://soldearenales.com/galeria/files/wesivagakewenebanekagawo.pdfIn PDF document text
    • http://china-engine.net/ckfinder/userfiles/files/gipazigilubisusijef.pdfIn PDF document text
    • http://lica.plovdivweek.com/js/ckfinder/userfiles/files/78759044515.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ecrbgtt5b66es3s01kbe1b5ds4/54341971181.pdfIn PDF document text
    • http://cameradungphat.com/uploads/files/11295471325.pdfIn PDF document text
    • http://gsoam.ge/wp-content/plugins/formcraft/file-upload/server/content/files/1613e9d578d36e---fabeze.pdfIn PDF document text
    • https://www.gryf-wet.pl/ckfinder/userfiles/files/zijugefubetu.pdfIn PDF document text
    • https://tectrongim.com/uploads/files/xikaropo.pdfIn PDF document text
    • http://asacnfservices.com/ckfinder/userfiles/files/wekasogonapiben.pdfIn PDF document text
    • http://tehla.eu/userfiles/file/20789479395.pdfIn PDF document text
    • http://dangkykinhdoanhkiengiang.com/upload/ck/files/letoxukurubomujepiximerik.pdfIn PDF document text
    • http://mrcookie.tw/upload/editor/file/182252204632.pdfIn PDF document text
    • http://www.olympussverige.se/wp-content/plugins/super-forms/uploads/php/files/ml82l7b71e11v2lcvmlrn899nk/vesodogiwebixuwulodugo.pdfIn PDF document text
    • http://haciogullari.com/depo/sayfaresim/file/13662624368.pdfIn PDF document text
    • http://domesticsolutionsagency.com/userfiles/file/81321170113.pdfIn PDF document text
    • http://improntediteatro.it/userfiles/files/36882940172.pdfIn PDF document text
    • http://purofirstli.net/userfiles/file/19953388620.pdfIn PDF document text
    • http://stsaischoolamritsar.com/slbdavbatala/userfiles/file/jabovimizuxo.pdfIn PDF document text
    • https://everywheregenes.com/uploadfile/qu26_qu106_com/files/45115087001.pdfIn PDF document text
    • https://cosmopolitanhotel.eu/uploads/wysiwyg/files/99274584936.pdfIn PDF document text
    • http://sententtech.com/file_media/file_image/file/bifofibesivumu.pdfIn PDF document text
    • https://jmtours.co/aym_image/files/tanaberoxodafadukabes.pdfIn PDF document text
    • http://rooptex.com/uploads/49396337286.pdfIn PDF document text
    • https://athenaeumchessclub.com/ckfinder/userfiles/files/riselojevovogonuv.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_off0000ae9f.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xAE9F 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c6b6.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC6B6 10828 bytes
SHA-256: d741509c2deb904dfb3709f13b4de8070de4c542d692969f0dd6659a8cd5cdcf
font_02_sfnt_off0000df82.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDF82 14104 bytes
SHA-256: 495ec27bcb0a3a6f0f2e9a9c2db3652fc1197b01e9e4e8e62292c321f49a1a70