Malicious PDF — malware analysis report

Static analysis result for SHA-256 943582d62e5975b6…

MALICIOUS

PDF

79.7 KB Created: 2021-09-21 04:32:53 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 05cc768d7406aeefc5f5d9cc4b3b8e47 SHA-1: 24187308743dacbd9d4f0514016deec389ad4215 SHA-256: 943582d62e5975b6ab80dd95d080b4b0e5a5eb71f96c9b3df9e5fca268bc05ea
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains embedded JavaScript, a common technique for executing malicious code within documents. It also features a large number of external URIs, many pointing to disposable domains, indicating a link farm designed to obscure the ultimate destination. The ML classifier and ClamAV detection strongly suggest malicious intent, likely for phishing or distributing further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9985

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.
  • 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://moraure.net/js/ckfinder/userfiles/files/sutaloxurisajenivelin.pdf In PDF document text
    • https://lesartsdansmonjardin.com/userfiles/file/20210917054539.pdfIn PDF document text
    • https://maturana.cl/upload/file/xapodiradib.pdfIn PDF document text
    • http://moriefrusca.com/userfiles/files/ditonitepinilarikil.pdfIn PDF document text
    • http://pravkniga.ru/files/userfiles/files/mukafinugenetotilorazelus.pdfIn PDF document text
    • https://www.loisirs-auto-occasion.fr/ckfinder/userfiles/files/8587481573.pdfIn PDF document text
    • http://globalsublimation.net/uploadfile/files/xobezulamulawabaj.pdfIn PDF document text
    • http://aajude.pt/backoffice/ckfinder/userfiles/files/pepekoxomizolekorelesu.pdfIn PDF document text
    • http://519pf.com/userfiles/files/51147789224.pdfIn PDF document text
    • https://smartcirclegroup.com/userfiles/file/16896918653.pdfIn PDF document text
    • http://itcbeautytrainingschool.com/userfiles/file/bijajozovak.pdfIn PDF document text
    • http://28777886.com/Lpf/UPFILE/userfiles/files/77588973647.pdfIn PDF document text
    • https://bursaceviritercume.com/wp-content/plugins/formcraft/file-upload/server/content/files/1614475fa98f1d---92129042577.pdfIn PDF document text
    • http://rosg.net/sa_upload/userfiles/file/20210919045616.pdfIn PDF document text
    • https://mavachhaiphong.com/upload/files/57244976824.pdfIn PDF document text
    • http://osayit.com/images/file/81678558265.pdfIn PDF document text
    • https://renetravel.ro/images/files/lodevaj.pdfIn PDF document text
    • http://anhuishangbiao.com/upload_fck/file/2021-9-6/20210906222703305519.pdfIn PDF document text
    • https://pnvvr.ro/userfiles/file/pivogupuxijaseki.pdfIn PDF document text
    • http://ilkconstruction.com/Images/Media/files/xadodopanapa.pdfIn PDF document text
    • http://sriraghavendratemple.com/ckfinder/userfiles/files/48458976957.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/S30rS-6n6vg/uplcv?utm_term=tetris+battle+freePDF link annotation
    • 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_off0000d5f9.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5F9 17272 bytes
SHA-256: 84136f89f68c3d179e5183ebcce18d403ff982703b9a3f3dec15a9788c0a4c4a
font_01_sfnt_off000102d1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x102D1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011ae8.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11AE8 10088 bytes
SHA-256: 2bd8a79d83877eee09bcf31b8ee19ced883fb99fccd7a3d75ba3d36120615912

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