Malicious PDF — malware analysis report

Static analysis result for SHA-256 b89ac1df8f9771b0…

MALICIOUS

PDF

76.0 KB Created: 2021-09-21 00:46:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: bcded048be22e600005b5c79c42c68b5 SHA-1: 8a0e381a6a62bda1e4f9ed16dbf8ca2836d6e9ae SHA-256: b89ac1df8f9771b06e3ef8e17b0cf17d60c3c527f3391ae163c276a056438a35
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF was flagged by ML and ClamAV as malicious, exhibiting characteristics of a link farm with numerous disposable domains. The presence of embedded URIs and the PDF's structure suggest it is designed to redirect users to potentially harmful websites, likely for phishing or malware delivery. No scripts were extracted, but the PDF structure itself facilitates the attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • 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.
  • 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://izyskately.ru/foto/ck/files/xexegimogox.pdf In PDF document text
    • http://auvergne.annuaire-regional.com/ckfinder/userfiles/files/11941962261.pdfIn PDF document text
    • http://www.iqubz.com/wp-content/plugins/formcraft/file-upload/server/content/files/1613b12c3e49bb---89710209818.pdfIn PDF document text
    • http://tehnicgaz.eu/files/file/87540836648.pdfIn PDF document text
    • http://cs-web-design.de/ablage/userfiles/files/mewoliwenijitete.pdfIn PDF document text
    • http://ceramicaartisticamarsalese.it/userfiles/files/radudujedu.pdfIn PDF document text
    • http://konferencii.org/web/uploads/assets/file/valen.pdfIn PDF document text
    • http://aodaibooking.com/FileData/ckfinder/files/20210917_27B1D7490B34EA95.pdfIn PDF document text
    • http://s2group.pl/userfiles/file/50066648373.pdfIn PDF document text
    • http://www.rajpuc.pl/pics/file/juwilozuwizukelanalezed.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/13667783415.pdfIn PDF document text
    • http://paitoonbox.com/userfiles/files/98210240301.pdfIn PDF document text
    • http://cga82.com/admin/File/jogifanodisaparutugupu.pdfIn PDF document text
    • http://debeight.net/UserFiles/File/velolaliminiverekasawob.pdfIn PDF document text
    • http://oipipleszno.pl/userfiles/file/zazejelube.pdfIn PDF document text
    • http://ecohort.com/userfiles/files/koserilevuzoxena.pdfIn PDF document text
    • http://gaia-onlus.org/userfiles/file/bupibade.pdfIn PDF document text
    • https://x-software.cz/data/file/botelasasukanonenu.pdfIn PDF document text
    • https://etevent.itweald.com/uploads/files/6135ce5e0020d.pdfIn PDF document text
    • http://jiangsutravel.kr/userfiles/files/20210908_085037.pdfIn PDF document text
    • http://gerastar.com/userfiles/file/vumusi.pdfIn PDF document text
    • https://es21sys.com/userfiles/file/92200974832.pdfIn PDF document text
    • https://okud-istra.hr/userfiles/file/18569980155.pdfIn PDF document text
    • https://www.cir.cloud/wp-content/plugins/formcraft/file-upload/server/content/files/1614808558bb2c---vekatozibuw.pdfIn PDF document text
    • http://toptoptraining.ru/img/upload/file/24324940090.pdfIn PDF document text
    • https://feedproxy.google.com/~r/skout/mBVl/~3/Om9ozkHLxGw/uplcv?utm_term=decompile+and+recompile+apkPDF 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_off0000c49d.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC49D 17712 bytes
SHA-256: 7a24bccbe0752ac593d11a29baf755b8e47f9fbb960ef5007d9c20e689a3224f
font_01_sfnt_off0000f2bd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF2BD 10500 bytes
SHA-256: f7a4b25122587c2e9ceed24d1d785315aa2629c449d80a19fd4e11e6879df6a8
font_02_sfnt_off00010a80.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10A80 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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