Malicious PDF — malware analysis report

Static analysis result for SHA-256 3ac8ab7cb9a7a230…

MALICIOUS

PDF

80.1 KB Created: 2021-09-16 17:58:32 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: 51bdd1641888a2dacd0c9df83027d7a8 SHA-1: a013fd0aa2874a77102b0e70a01e42115215dc75 SHA-256: 3ac8ab7cb9a7a23044914781ba7b0f5a3ae28edba519a68a28fa0c169328bd0a
134 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF file was flagged as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains embedded JavaScript and external URIs, with one URI pointing to 'coretry.ru' which is associated with a 'change android keyboard' lure. The presence of embedded JavaScript suggests an attempt to execute malicious code within the PDF viewer, likely to facilitate further exploitation or redirection.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9953

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://coretry.ru/uplcv?utm_term=change+android+keyboard PDF link annotation
    • http://apnschool.in/singhania/downloads/file/woduzakakizezeriselejob.pdfIn PDF document text
    • https://bk.knu.ac.kr/ckfinder/userfiles/files/galuva.pdfIn PDF document text
    • https://marljivo.hr/userfiles/file/rigowopijexudujis.pdfIn PDF document text
    • https://mkserwis.pl/userfiles/file/43585155853.pdfIn PDF document text
    • http://bolt.fo/public_html/userfiles/files/7429835028.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/xevajivub.pdfIn PDF document text
    • http://turar-mussin.com/userfiles/File/jesoxileradekuwitelan.pdfIn PDF document text
    • https://www.mnogotrop.com/ckfinder/userfiles/files/norolugikeduro.pdfIn PDF document text
    • http://csc010.com/userfiles/file/20210909160657_u112le.pdfIn PDF document text
    • http://algarestofos.pnh.pt/js/ckfinder/userfiles/files/36069543290.pdfIn PDF document text
    • https://hssanesteban.cl/files/pivonorukagenovagusuk.pdfIn PDF document text
    • http://fu-xin.tw/uploads/files/202109022207228678.pdfIn PDF document text
    • https://pabausa.org/wp-content/plugins/formcraft/file-upload/server/content/files/16135c2f9c9a57---bozudaferujixa.pdfIn PDF document text
    • http://picart-personal.pl/fckupload/upload/file/mesafofabijomabovetibis.pdfIn PDF document text
    • http://andrenickels.de/ckfinder/userfiles/files/wibasutoluvube.pdfIn PDF document text
    • https://iwanbim.com/userfiles/files/bumesuwota.pdfIn PDF document text
    • http://faurau.com/luodan/images/userfiles/file/xuxenofamovokanozeze.pdfIn PDF document text
    • http://simonhoirup.dk/userfiles/file/64334844443.pdfIn PDF document text
    • http://booklandbooks.com/userfiles/file/jazuvor.pdfIn PDF document text
    • http://i-harmonics.com/upload/files/jaxunerozonapigurafub.pdfIn PDF document text
    • http://rigosarchitects.gr/userfiles/file/73652473554.pdfIn PDF document text
    • https://longislandinvestmentadvisors.com/nini/userfiles/file/biralixuf.pdfIn PDF document text
    • http://projecthouse.bg/uploads/CKfinder/files/60132677759.pdfIn PDF document text
    • http://tienhasteel.com/app/webroot/upload/files/67450244391.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_off0000d6af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD6AF 17316 bytes
SHA-256: 2904034e2ba3044121083412b726d74daaaf3a3cbe47d76f3343afcf7ec175cd
font_01_sfnt_off00010344.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10344 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off00011b5b.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11B5B 10592 bytes
SHA-256: 0f695b0bf9bb50cc8fafe7f23a27128c190522caf5b0424880e750638fcd67c9

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