Malicious PDF — malware analysis report

Static analysis result for SHA-256 54d20e4131810065…

MALICIOUS

PDF

77.1 KB Created: 2021-09-20 10:45:39 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: 559fb600fd3d1f20b7a85d84db66138d SHA-1: 3c898df929e66969d2f0bf64512f539adf2ac634 SHA-256: 54d20e41318100650ab7bbbfc189e7c35f247fe930a614e0dd5704cd02324042
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is a PDF identified as malicious by ML classifiers and ClamAV. It contains numerous embedded URLs pointing to potentially malicious domains, indicating a link farm or phishing attempt. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic further supports this, suggesting the document is designed to host many links on disposable hosting. No scripts were extracted, but the presence of external URIs and the link farm nature strongly suggest an attempt to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9973

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=achartengine+android+example PDF link annotation
    • http://gongotour.com/FileData/ckfinder/files/20210912_697B2598360333D3.pdfIn PDF document text
    • https://thic.net/plugin/ce1/ckfinder/userfiles/files/94468826745.pdfIn PDF document text
    • http://grubstreet.ca/ckfinder/userfiles/files/bixoxijosuketisupexaw.pdfIn PDF document text
    • https://bienenaktuell.com/sites/bienenaktuell.com/files/file/berubakilavipu.pdfIn PDF document text
    • http://xpeedon.net/userfiles/file/20210920070917.pdfIn PDF document text
    • https://atlastoursntravels.com/userfiles/file/52329556584.pdfIn PDF document text
    • http://lucchetta.net/userfiles/files/tuzosuvogidagiwowujawu.pdfIn PDF document text
    • https://mobilpetrol.olajpark.hu/files/files/58354719969.pdfIn PDF document text
    • https://macauroommate.com/ckfinder/userfiles/files/wakabalibowilolu.pdfIn PDF document text
    • http://www.anclupnapoli.it/userfiles/file/29524496005.pdfIn PDF document text
    • https://ladangmimpi.com/contents/files/xesaxazelodudomuj.pdfIn PDF document text
    • http://daimarconstrucciones.com/images/admin/file/xosapegozoluradaduzatidev.pdfIn PDF document text
    • http://www.cemeba.com/uploads/ckfinder/files/53696335072.pdfIn PDF document text
    • http://argyleliquidations.com/userfiles/files/63016631656.pdfIn PDF document text
    • http://tuzy.pl/Upload/file/vudoruwofiretudi.pdfIn PDF document text
    • https://episcopiaoradiei.ro/files/jonigukefeveruwevavas.pdfIn PDF document text
    • https://mimpishio1.com/contents/files/7923248641.pdfIn PDF document text
    • https://rjiminfra.com/wp-content/plugins/super-forms/uploads/php/files/e08dd2cf005313dd48c2f857139a6996/25010287476.pdfIn PDF document text
    • http://chi-kara.net/Upload/files/6296414706.pdfIn PDF document text
    • https://oncetrabzon.com/resimler/files/43267815545.pdfIn PDF document text
    • https://vivekanandbawwa.com/userfiles/file/bofotobujozopadubusin.pdfIn PDF document text
    • https://anukulagrotech.com/ci/userfiles/files/neseso.pdfIn PDF document text
    • http://medob.org/SITE/files/editor/file/bulosaxikinisakosifilodun.pdfIn PDF document text
    • http://0851gay.org/userfiles/202109file/2021090313480270554.pdfIn PDF document text
    • https://titishop.co/upload/files/73879960317.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_off0000c2a1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC2A1 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000dab3.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDAB3 19528 bytes
SHA-256: 9e3bd9a3a6409b2c9b5916161bc38b8d3202bb0596c6efaf46db03e5427b0319
font_02_sfnt_off00010da0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10DA0 10876 bytes
SHA-256: 09f745128477aa212843365d741719508aef2c56961730001e3d184c57dff387