Malicious PDF — malware analysis report

Static analysis result for SHA-256 2c4bbdf4fb15d112…

MALICIOUS

PDF

105.7 KB Created: 2021-10-06 06:04:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-11-25
MD5: ec27c5bddea744d3e889db21a288ba2a SHA-1: ce78e44f8982a168afa41d5296dd81e1c01616ed SHA-256: 2c4bbdf4fb15d1128b10f2ccebbdb563db855105980ce3354f97edd9a0725c98
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file was detected as malicious by ClamAV and an ML classifier, indicating a high likelihood of malicious intent. It contains numerous external URLs, many of which are part of a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. Although no scripts were explicitly extracted, the PDF structure and heuristic firings point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9986

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://synerhu.ru/uplcv?utm_term=substring+in+pyspark PDF link annotation
    • http://seoulgreeter.com/userData/board/file/xaliko.pdfIn PDF document text
    • https://anpheatingandac.net/nbloom/fckuploads/file/95325262909.pdfIn PDF document text
    • http://vasilii-orlov.fun/wp-content/plugins/super-forms/uploads/php/files/981375b26f465541720d2f0ac965683c/3760910765.pdfIn PDF document text
    • https://maryamghiasi.com/images/upload/files/tunawikajebudelo.pdfIn PDF document text
    • http://www.slenderclub.cz/ckfinder/userfiles/files/32714707999.pdfIn PDF document text
    • http://uralinteh.com/uploads/files/20737240910.pdfIn PDF document text
    • http://ehomerealestate.org/images/file/81125933459.pdfIn PDF document text
    • http://malifer.hu/upload/file/gujotunejetuguja.pdfIn PDF document text
    • http://gardatrans.com/content/Files/53553833525.pdfIn PDF document text
    • http://cassotech.nl/site/data/ws/files/66270788485.pdfIn PDF document text
    • http://www.scea.edu.mn/ckfinder/userfiles/files/tetuganavirazakegi.pdfIn PDF document text
    • http://viral-list-monster.com/ckfinder/userfiles/publics/files/27171933676.pdfIn PDF document text
    • http://nessium.fr/userfiles/file/getak.pdfIn PDF document text
    • http://kepco-group.com/uploaded_files/userfiles/files/80589124691.pdfIn PDF document text
    • http://gaytonfa.com/upload/files/2131276476.pdfIn PDF document text
    • http://orsini-blasioli.it/userfiles/files/7669316121.pdfIn PDF document text
    • http://parikshitconstruction.com/uploads/dizolamadijuzi.pdfIn PDF document text
    • http://www.aragonemprendedor.com/userfiles/files/vubugorakewawirukoja.pdfIn PDF document text
    • http://xn--9w3b270a7kf.kr/data/editor/file/serokedelu.pdfIn PDF document text
    • http://chaireyes.com/v15/Upload/file/2021929143117141.pdfIn PDF document text
    • http://erex.hu/upload/file/wutegepipobosel.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_off0001336e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x1336E 10648 bytes
SHA-256: 79031a5222e441ba3df56cd38cfcd5b5d84220fec442af628d00ae40648e3798
font_01_sfnt_off00014bbc.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14BBC 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off000163ce.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x163CE 20548 bytes
SHA-256: 1014a5c6e76dbcdc263932ce832b38a271ab9638d7427d1c91844ef7d5a54610

Open this report in the interactive analyzer, or submit your own file for analysis.