Malicious PDF — malware analysis report

Static analysis result for SHA-256 e94b06f8f939bb13…

MALICIOUS

PDF

70.1 KB Created: 2021-09-09 15:32:00 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-11
MD5: ba085670b42465b528ff07e995365e1d SHA-1: 1d8a7006803778b003ea789420723f3caf8294bd SHA-256: e94b06f8f939bb13464c85b3fdb36e96b9252a6ae622c999f706a5f9ba8a611c
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The sample was flagged by ML classifiers and ClamAV as malicious. It contains numerous embedded URLs, many of which point to PDF files hosted on potentially disposable domains, suggesting a link farm or phishing lure. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic indicates a high number of distinct hosts and links, reinforcing the malicious intent. While no scripts were explicitly extracted, the nature of the embedded URLs and the PDF structure strongly suggest it's designed to redirect users to malicious content.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9982

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://www.hotel-margherita.com/wp-content/plugins/formcraft/file-upload/server/content/files/161393fc61471a---lowikeniv.pdf In PDF document text
    • https://hongmao.tw/uploads/files/202108311856259324.pdfIn PDF document text
    • https://lorus.rs/files/kebovaxu.pdfIn PDF document text
    • http://hytechplus.com/userfiles/file/sisarojubifodavafefaw.pdfIn PDF document text
    • https://www.tctnanotech.com/wp-content/plugins/super-forms/uploads/php/files/fbf8cf9bfb01aa44442a3afac16d70e5/4447580131.pdfIn PDF document text
    • https://mayxaydungthienlong.com/uploads/files/files/murugitug.pdfIn PDF document text
    • http://hunicorn.hu/userfiles/file/32954451012.pdfIn PDF document text
    • http://uptownherndon.com/uploads/files/fafatizusebunasabikifenit.pdfIn PDF document text
    • http://tjsyjdq.com/v15/Upload/file/202194412475710.pdfIn PDF document text
    • http://vector-luczak.pl/new/fck_user_files/file/bavelotufajifupinuxeboli.pdfIn PDF document text
    • http://cybernet-ap.com/UserFiles/File/waweb.pdfIn PDF document text
    • http://www.vegagastro.pl/upload/file/47100847807.pdfIn PDF document text
    • http://christschoolblr.in/userfiles/file/xebujodovuveluwoluzag.pdfIn PDF document text
    • http://lt101shop.com/userfiles/files/kisalenixomererudew.pdfIn PDF document text
    • https://centrorevisionimonregalese.it/file/budopakukunivup.pdfIn PDF document text
    • https://skinrepublic.vn/webroot/img/files/wotagu.pdfIn PDF document text
    • http://villahetzwartepaard.nl/survey/userfiles/files/bupeta.pdfIn PDF document text
    • http://strap.sk/uploads/files/88225251731.pdfIn PDF document text
    • http://aisne.proximeo.com/ckfinder/userfiles/files/87666376757.pdfIn PDF document text
    • http://okna-dvere-online.cz/media/upload/upload/file/zifejirofofer.pdfIn PDF document text
    • http://educasters.co/ckfinder/userfiles/files/48610815089.pdfIn PDF document text
    • http://grafiport.com/userfiles/file/63947514545.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/LPIa9PGmDLg/uplcv?utm_term=pubg+kr+32+bit+mod+apkPDF 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_off0000b27e.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xB27E 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000ca90.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCA90 15476 bytes
SHA-256: 41a2407bd2e9f9a324dd1f8cc48b53001ce23c4f4deff1a601e39a7216593d42
font_02_sfnt_off0000f247.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF247 10908 bytes
SHA-256: 31fb350daa2b0a4f8441b6f39dcc23c48eee24d85c5988bab97072c756701e60

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