Malicious PDF — malware analysis report

Static analysis result for SHA-256 8c361801ce4600ce…

MALICIOUS

PDF

85.0 KB Created: 2021-09-18 10:16:21 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-16
MD5: 489ab845e9ed967989184834bb8ca2d9 SHA-1: a7f0aece54d616aaf28d3671a86dee46f11a1b56 SHA-256: 8c361801ce4600cef5e8423dadd8794b46a54b8f242973a9bf724d6162095f41
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to domains that host other PDF files, indicating a link farm or redirection mechanism. ClamAV and ML classifiers flagged this PDF as malicious, specifically as a phishing or trojan variant. The presence of external URIs and the structure suggest it's intended to redirect users to malicious content, likely as part of a phishing campaign or to download further malware.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

Heuristics 5

  • 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.
  • 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=best+bass+guitar+tuner+app+android PDF link annotation
    • http://hstairan.com/FCKeditor/editor/filemanager/connectors/php/userfiles/file/92987766649.pdfIn PDF document text
    • http://jjw-led.com/userfiles/file/44302211814.pdfIn PDF document text
    • http://auburn-companies.com/userfiles/files/21103255118.pdfIn PDF document text
    • https://qpshouse.com/upload/image/file/sorovutubezeromizipefa.pdfIn PDF document text
    • http://numere-mopede.ro/mm/file/36474461430.pdfIn PDF document text
    • http://giovanniseneca.eu/userfiles/files/turidisavobivifolarava.pdfIn PDF document text
    • https://cortopolis.ar/userfiles/file/24577583679.pdfIn PDF document text
    • https://democv.associasuite.com/imagenes/contenidos/files/74514577436.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/51481603032.pdfIn PDF document text
    • http://noxsun.com/jingkelun/userfiles/files/20210916050841.pdfIn PDF document text
    • http://bibliotekaszamocin.pl/img/upload/files/sajabunijuw.pdfIn PDF document text
    • http://greenworx.eu/images/uploads/files/filuguroxijax.pdfIn PDF document text
    • https://tenhucchi.com/upload/files/zutugakisozuduvezenavema.pdfIn PDF document text
    • http://www.bash.cl/media/file/24021754012.pdfIn PDF document text
    • https://stratasphere.online/userfiles/file/vixunetetekupugu.pdfIn PDF document text
    • http://bjerkelunden.org/content/files/userfiles/file///22392070457.pdfIn PDF document text
    • http://millecolori.it/images/file/jugoxarewedeb.pdfIn PDF document text
    • https://bloomland.com/sites/bloomland.com/files/mifegilunevujenaxunip.pdfIn PDF document text
    • http://koreanhotpot.com/uploads/files/fitolikasotafipirif.pdfIn PDF document text
    • http://wenyanchem.com/upload/files/terinizopivuvovikirewu.pdfIn PDF document text
    • http://kuppersbusch.hu/userfiles/files/70601949538.pdfIn PDF document text
    • http://www.slappedtogether.com/editoruploadfiles/file/xuxirifunisepixefuv.pdfIn PDF document text
    • http://xn--knstlerische-biografie-arbeit-lbd.ch/userfiles/files/tokebotibulasexi.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_off0000e7a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE7A7 17684 bytes
SHA-256: 9491d38e24ab2ba3878b8116c9d73545432e3e4435a20c8b6bf896e7ce1b9af6
font_01_sfnt_off0001155a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1155A 10816 bytes
SHA-256: 8c7eb67d8d963f0d267169cd29f0948f31b0d3d9d31acb6a6e6d44b3f770773a
font_02_sfnt_off00012e08.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12E08 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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