Malicious PDF — malware analysis report

Static analysis result for SHA-256 8eb1527380121c72…

MALICIOUS

PDF

82.0 KB Created: 2021-09-18 22:46:50 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 57abd34690132926d5a8b3e28f11ad15 SHA-1: c4763dfa77023b786b2f67ae0027767efc527393 SHA-256: 8eb1527380121c72ee2dc6bd2f7b7edc2eec79f53bb92b07028ffae743711263
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The presence of numerous external URIs, many of which are part of a link farm hosted on disposable domains, suggests a phishing or malware distribution campaign. Although no scripts were explicitly extracted, the PDF structure and URI patterns are consistent with techniques used to redirect users to malicious sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9964

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://coretry.ru/uplcv?utm_term=game+ppsspp+bola+2021 PDF link annotation
    • http://naoshima-habitant.com/images/blog/file/surezasuruka.pdfIn PDF document text
    • http://domingo.hu/ckfinder/userfiles/files/barubepujuwepixodex.pdfIn PDF document text
    • http://banglenhospital.com/UserFiles/File/genopute.pdfIn PDF document text
    • http://cnhhgj.com/upfiles/userfiles/file/duguka.pdfIn PDF document text
    • https://ichapps.com/ichapps/ckeditor-ckfinder-integration/uploads/files/27643683953.pdfIn PDF document text
    • http://lynxauto.ru/userfiles/file/xamisanividijulu.pdfIn PDF document text
    • https://www.karelo.com/uploads/File/mitopejorupafuveke.pdfIn PDF document text
    • http://simkoongschool.com/uploads/editer/files/nefadixidomiwunutuveze.pdfIn PDF document text
    • http://goksirkrupskimlyn.pl/img/upload/files/papuveta.pdfIn PDF document text
    • https://orderpoet.com/ckfinder/userfiles/files/datejepu.pdfIn PDF document text
    • https://bank-kredit.at/ckfinder/userfiles/files/widakukeguv.pdfIn PDF document text
    • https://sanaspinler.net/calisma2/files/uploads/75184263726.pdfIn PDF document text
    • http://sashtraayurveda.com/ckfinder/userfiles/files/70943823159.pdfIn PDF document text
    • https://yesilkoyluleriz.biz/resimler/files/lipifibi.pdfIn PDF document text
    • https://hargagila.com/uploads/image/files/xomejo.pdfIn PDF document text
    • https://apartmani-mestrovic-krk.hr/files/worivegozug.pdfIn PDF document text
    • http://snookerfootball.eu/wp-content/plugins/formcraft/file-upload/server/content/files/16144bcd7920c6---60005568435.pdfIn PDF document text
    • https://inlandautorepairmurrietaca.com/wp-content/plugins/super-forms/uploads/php/files/b312974fbb3a8faf99180807bd4e7250/4083377312.pdfIn PDF document text
    • http://yuanjen.com/ckfinder/userfiles/files/5789389343.pdfIn PDF document text
    • https://pgprojekt.pl/Upload/file/ketulupesirusowiliz.pdfIn PDF document text
    • http://mh-gartengestaltung.de/userfiles/file/jigisogezuzugoxit.pdfIn PDF document text
    • https://morganmethod.tuesdaytrader.com/ci/userfiles/files/kikisajibus.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_off0000d5de.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD5DE 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000edf5.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEDF5 10492 bytes
SHA-256: ec0e8ef998cc5b4acaa4a1bef8285393de12bcc5ff5b2996d8aad353c7fc601c
font_02_sfnt_off000105af.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x105AF 20336 bytes
SHA-256: 59691c5b714ef097c810a23e36d04c93e2806917dcf9023300229d5191fa3a20

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