Malicious PDF — malware analysis report

Static analysis result for SHA-256 44d711a2dafe0b7b…

MALICIOUS

PDF

69.4 KB Created: 2021-10-01 18:45:35 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-27
MD5: bb7a094ee9213b3225d0d9d8c63edb30 SHA-1: c0bea9ba32673850244cdbb59f38b9da1bbdda4f SHA-256: 44d711a2dafe0b7b7a6f244c76ca92d9889db78bd3bb1ae489bc31f00f3b2903
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF document was flagged by multiple heuristics, including ML and ClamAV, indicating malicious content. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm on disposable hosting, likely to obscure the true destination or distribute malware. While no scripts were explicitly extracted, the presence of numerous embedded URLs points towards a phishing or malware distribution attempt, potentially leveraging JavaScript for execution within the PDF viewer.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://beautydent.hu/editor_up/18821537881.pdf In PDF document text
    • http://rajhansnursery.com/userfiles/file/27895435942.pdfIn PDF document text
    • http://holdemigny.fr/ckfinder/userfiles/files/tawudubugim.pdfIn PDF document text
    • http://buyo-g.net/userfiles/file/74550705719.pdfIn PDF document text
    • http://sor1310.com/userfiles/file/92490908068.pdfIn PDF document text
    • http://bhk-aindling.com/userfiles/files/32148373125.pdfIn PDF document text
    • http://studiosiciliani.eu/userfiles/files/botetinexomuxazotima.pdfIn PDF document text
    • http://doorsatyrau.com/ckfinder/userfiles/files/48077588192.pdfIn PDF document text
    • https://j26clean.com/upload/files/8057739024.pdfIn PDF document text
    • https://dongciao.com/uploads/files/202109091056597042.pdfIn PDF document text
    • https://webdatedepot.com/userfiles/file/70828359758.pdfIn PDF document text
    • https://www.gml.de/wp-content/plugins/formcraft/file-upload/server/content/files/16130ffed02dcd---pefunu.pdfIn PDF document text
    • http://www.me.ntou.edu.tw/ckfinder/userfiles/files/20210917_074948.pdfIn PDF document text
    • https://www.brunosistemi.com/wp-content/plugins/formcraft/file-upload/server/content/files/16132e6ce50d3d---77880654881.pdfIn PDF document text
    • http://vevo.keresztessyoptika.hu/elemek/file/lason.pdfIn PDF document text
    • https://dienmayminhchau.vn/uploads/news_file/pawoti.pdfIn PDF document text
    • http://fratellibeninca.com/images/file/29006506972.pdfIn PDF document text
    • http://nuklearmedizin-amro.de/userfiles/file/71854383314.pdfIn PDF document text
    • https://wct.goldcrownresort.com/magazine_files/files/gezixazexapaba.pdfIn PDF document text
    • http://niengrangchuyensau.com/upload/contentFile/file/85059896901.pdfIn PDF document text
    • http://kayamedbursa.com/userfiles/file/87960099368.pdfIn PDF document text
    • https://iwanbim.iwan.co/userfiles/files/15261467993.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/fzgW7-mxBc0/uplcv?utm_term=american+english+file+4+student+book+answer+key+pdfPDF 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_off0000b071.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB071 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000c888.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xC888 11656 bytes
SHA-256: ff3304b42ac0a3d10a948568ec2e17f12bb0a7ba9c7b523a73cd114a762918c3
font_02_sfnt_off0000e3c1.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE3C1 14232 bytes
SHA-256: 32075d3178e675dd4e215de7f4ed34a41660b21d8814f292a56e3b32e4e6a97b

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