Malicious PDF — malware analysis report

Static analysis result for SHA-256 b72002af2370ef5a…

MALICIOUS

PDF

75.2 KB Created: 2021-09-18 01:26:19 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-12
MD5: 59c0bef56b281dd00b94379e26986f53 SHA-1: 8901887ae0185bae08da4097736bb4bccc7f26e8 SHA-256: b72002af2370ef5aaf6efa94e17f7cb603a7b05b090be86d33f455e4765dea65
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to external domains, indicating it functions as a link farm. The ML classifier and ClamAV detection strongly suggest malicious intent, likely phishing or malware distribution. The heuristic 'PDF_SEO_DISPOSABLE_LINK_FARM' confirms the nature of the PDF, and the presence of external URIs further supports this. No scripts were extracted, but the overall structure and URL distribution are indicative of a malicious lure.

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=how+to+send+video+to+tv+from+android PDF link annotation
    • https://bwawarszawa.pl/upload/file/54010765410.pdfIn PDF document text
    • https://monyetmesum.com/contents/files/86014413318.pdfIn PDF document text
    • http://newgrids.com/userfiles/file/1346234713.pdfIn PDF document text
    • http://slkuang.com/v15/Upload/file/20219151611173136.pdfIn PDF document text
    • http://burelomdo.com/ckfinder/userfiles/files/75866319258.pdfIn PDF document text
    • http://anapro.com/ckfinder/userfiles/files/xosibotenagasugel.pdfIn PDF document text
    • https://dalycity.com/wysiwygfiles/file/xotanaponufoliwerarulolu.pdfIn PDF document text
    • https://adamant54.ru/userfiles/files/madafajezelipudenik.pdfIn PDF document text
    • https://icon-studios.com/userfiles/file/11079675198.pdfIn PDF document text
    • https://superpackeg.com/userfiles/file/73715968191.pdfIn PDF document text
    • http://iglozawiercie.pl/zdjecia/file/zepixuzukepozoketukezodow.pdfIn PDF document text
    • http://konberdbio.com/upload/files/17671861119.pdfIn PDF document text
    • https://proetcontra.hu/userfiles/file/dopikeximanev.pdfIn PDF document text
    • http://workcoop.org/fckeditor/userimages/file/20210903054545.pdfIn PDF document text
    • https://ateliersmq.com/pevron/www/img/file/53996699929.pdfIn PDF document text
    • http://les-dvorik.ru/userfiles/file/nafalesiwetodakife.pdfIn PDF document text
    • https://airbays.com/userfiles/file/24627694358.pdfIn PDF document text
    • http://alvasari.com/wp-content/plugins/formcraft/file-upload/server/content/files/16140daf7c5fab---potevufozatukisoguj.pdfIn PDF document text
    • http://dwornawodzie.pl/userfiles/file/valasesomaxewumufozumetix.pdfIn PDF document text
    • http://kameleonhastanc.hu/files/file/51926594545.pdfIn PDF document text
    • http://knipia.com/userfiles/file/82462500855.pdfIn PDF document text
    • http://supermarketdv.ru/files/file/13671038480.pdfIn PDF document text
    • http://studiogiovannone.com/userfiles/files/jatasafumuluxi.pdfIn PDF document text
    • https://bomberosdenavarra.com/userfiles_nexo/files/66523645672.pdfIn PDF document text
    • https://grandegroup.net/files/darixosumitar.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_off0000c4ba.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC4BA 10612 bytes
SHA-256: 3c4eb9278a75302f113994031948f9dbc16e0826e555d97b5ebba6ef96e43606
font_01_sfnt_off0000dd03.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDD03 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_02_sfnt_off0000f515.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF515 16308 bytes
SHA-256: af2b12a9d2e6d857599c6d5078b2afd1be46f704dc90d86ac49fde63c8429859

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