Malicious PDF — malware analysis report

Static analysis result for SHA-256 2876eceed0e45cb2…

MALICIOUS

PDF

82.8 KB Created: 2021-09-18 12:11:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 513db582f2e790e02366b091923e7afa SHA-1: e2e5dac56902f526009c1da78cc39c02118068a3 SHA-256: 2876eceed0e45cb2c600c8fc80eb3573c6dbe1dbed3c371ddda21a4217444645
126 Risk Score

Malware Insights

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

The file is identified as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. The PDF contains numerous embedded URLs, many pointing to suspicious domains, and one heuristic specifically flags it as a link farm on disposable hosting. While no scripts were directly extracted, the PDF structure and the presence of external URIs suggest it's designed to redirect users to potentially harmful content, aligning with phishing or malware distribution tactics.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9981

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 http://mateuszkucharski.pl/admin/file/lanisalewunaxitug.pdf In PDF document text
    • http://bora.su/ckfinder/userfiles/files/27431621786.pdfIn PDF document text
    • http://2222.netsociality.com/upload/files/tilolivixezeru.pdfIn PDF document text
    • http://kkagro.com/media/images/upload/file/lanulijogolageguniweruvu.pdfIn PDF document text
    • http://noithatachau.vn/webroot/img/files/jenatugunapubepamaridub.pdfIn PDF document text
    • http://21cedu.com/pds/userfiles/files/daparedorafuvojorepenol.pdfIn PDF document text
    • https://kristaldicarlo.com/userfiles/file/8800728806.pdfIn PDF document text
    • http://a2kat.ru/userfiles/file/lopogujepaz.pdfIn PDF document text
    • http://www.pattyn360.com/upload/forum/files/dojonitupidos.pdfIn PDF document text
    • http://mail-ex.net/userfiles/file/febemokoraxo.pdfIn PDF document text
    • http://ty6600.com/userfiles/file/retakudape.pdfIn PDF document text
    • http://trips-in.com/ckupload/files/laropun.pdfIn PDF document text
    • http://snft.ro/media/file/60182080736.pdfIn PDF document text
    • https://binarbaidservices.com/public_html/userfiles/file/98310172118.pdfIn PDF document text
    • https://totspotdaynursery.co.uk/ckfinder/userfiles/files/sujowejixuwotekagenebijan.pdfIn PDF document text
    • http://gadkowski.pl/repository/filemanager/file/24742433879.pdfIn PDF document text
    • http://easyhypermarket.com/userfiles/file/83291359372.pdfIn PDF document text
    • https://alpinismbihor.ro/app/webroot/files/userfiles/files/paxowepozavibejuzamoso.pdfIn PDF document text
    • https://lifesmart.ro/ckfinder/userfiles/files/nabodeti.pdfIn PDF document text
    • http://aumnat2car.com/ckfinder/core/connector/php/upload/files/repolowinobomoko.pdfIn PDF document text
    • http://reguitti-engineering.it/userfiles/files/juwedigunolakep.pdfIn PDF document text
    • https://macroedunet.com/userfiles/file/kagus.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/1xuhb7AK25c/uplcv?utm_term=how+hide+app+in+androidPDF 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_off0000de10.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDE10 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f627.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF627 10252 bytes
SHA-256: 9369c4b36a495ecbbb7118c8acee281e485e49d5dda23e8eaa3cd21211495acc
font_02_sfnt_off00010d13.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x10D13 18812 bytes
SHA-256: 68c08d195d7423c630daaa9c89e0098d550d4c1a7277b0f0d59e62af2163aa9a

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