Malicious PDF — malware analysis report

Static analysis result for SHA-256 02cd9273b35af3b1…

MALICIOUS

PDF

79.3 KB Created: 2021-09-09 01:08:01 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-23
MD5: 894780dbaef40eef016dfe06f5bb34c2 SHA-1: 8fd5e9ecd251e11806d25ab3645f5e0be9cebd75 SHA-256: 02cd9273b35af3b1218c3f2364363ea4b4ab8cb84d2cdab7d14590950ea188dc
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF file was flagged by multiple heuristics, including a critical ClamAV detection and an ML classifier, indicating malicious intent. The PDF_SEO_DISPOSABLE_LINK_FARM heuristic suggests it functions as a link farm, directing users to numerous distinct hosts, which is a common tactic for phishing or malware distribution. Although no scripts were explicitly extracted, the presence of embedded URLs and the overall structure point towards a malicious document, likely delivered via spearphishing.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9968

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://shreenathtechnologies.com/userfiles/file/21300955845.pdf In PDF document text
    • http://factblogs.com/uploaded_files/userfiles/files/sejaluzoku.pdfIn PDF document text
    • http://turbotechnik24.de/userfiles/file/lufuguvanesij.pdfIn PDF document text
    • http://casier-a-bouteilles.com/file/rigasujutimupebaxufiral.pdfIn PDF document text
    • https://www.baust.edu.bd/app/webroot/ckfinder/userfiles/files/bikexodulig.pdfIn PDF document text
    • https://korankertas.com/contents/files/22574822118.pdfIn PDF document text
    • https://pointwebhost.com/calisma2/files/uploads/81963172390.pdfIn PDF document text
    • http://ingpiazza.eu/userfiles/files/98717813708.pdfIn PDF document text
    • https://thuaphatlaihanoi.net/uploads/files/muverimez.pdfIn PDF document text
    • https://yellowstonewildlife.com/23435653315.pdfIn PDF document text
    • http://tumwebthailand.com/ckfinder/userfiles/files/taradawesuzuburiw.pdfIn PDF document text
    • http://china-hold.com/UploadFile/file/20210907184853655.pdfIn PDF document text
    • http://air-con.ru/upload/files/kenisowajovut.pdfIn PDF document text
    • https://aksusu.com/upload/files/49914923268.pdfIn PDF document text
    • http://35ju.21tg.cn/uploadfile/ckeditor/files/97309822258.pdfIn PDF document text
    • http://ellenia3.eu/userfiles/files/33654387466.pdfIn PDF document text
    • http://labonscafe.com/userfiles/siriwivofexomegolisodu.pdfIn PDF document text
    • https://nhatngudongkinh.com/upload/ckupload/files/fojakik.pdfIn PDF document text
    • https://markapin.com/calisma2/files/uploads/noronubexewotajodo.pdfIn PDF document text
    • http://johnlillylaw.com/customer/3/d/9/3d947ad6ce2568d98b832ccf5548371bFile/62127614949.pdfIn PDF document text
    • http://ppfi-online.com/userfiles/file/10703383576.pdfIn PDF document text
    • https://wonwon.taipei/photo/file/batanosawenolovad.pdfIn PDF document text
    • https://feedproxy.google.com/~r/Uplcv/~3/BvfzZFkJO3s/uplcv?utm_term=star+wars+a+new+hope+putlockerPDF 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_off0000d234.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xD234 10732 bytes
SHA-256: 79706ce99d8ded1ee38a04f9af32f7af971238d834d4d415500886caa620fdea
font_01_sfnt_off0000eae0.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xEAE0 17416 bytes
SHA-256: f4e518a6526dff85457754c1ac418765374a7658828191eb78f784977e59cf2a
font_02_sfnt_off00011801.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11801 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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