Malicious PDF — malware analysis report

Static analysis result for SHA-256 deceda7117d81e09…

MALICIOUS

PDF

82.4 KB Created: 2021-09-19 06:20:55 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-24
MD5: 9ec7c678edf922f0bd2c5a96ac8336ac SHA-1: d2fbf1496848081fdf2958a25aebc902d77e9f00 SHA-256: deceda7117d81e09caeb6b85f3027c5feef8702032d365b87e7e86dc7257aed0
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous embedded URLs pointing to suspicious domains, many of which are structured as link farms. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for distributing further malware or phishing content. The document body is heavily obfuscated, preventing a clear understanding of its direct textual lure, but the overall structure and URL distribution suggest a malicious link farm.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9977

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://catamma.ru/uplcv?utm_term=pdf+software+for+pc+windows+10 PDF link annotation
    • https://thai-airpark.com/ckfinder/userfiles/files/jekositu.pdfIn PDF document text
    • http://muacuoi.vn/Pictures/files/73504425561.pdfIn PDF document text
    • http://ghinelliarchitettura.it/userfiles/files/13054992343.pdfIn PDF document text
    • http://kimura-shihoshoshi.com/userfiles/file/xowuwexewises.pdfIn PDF document text
    • http://sterenstein.ru/userfiles/file/61985696734.pdfIn PDF document text
    • http://diversecityuk.com/userfiles/file/79455101645.pdfIn PDF document text
    • http://marinaxaraes.com.br/ckfinder/userfiles/files/59827994902.pdfIn PDF document text
    • https://gad-elhak.com/userfiles/file/rebafavexewesamidakibura.pdfIn PDF document text
    • http://uat2.hkha.com.hk/ckfinder/userfiles/files/2779969020.pdfIn PDF document text
    • http://xutricolor.com/uploadfile/files/dosifezox.pdfIn PDF document text
    • http://studiomarazzi.eu/userfiles/files/56080801656.pdfIn PDF document text
    • https://esportenerd.com/app/webroot/ckfinder/userfiles/files/54401592862.pdfIn PDF document text
    • http://pjteam.hu/uploads/zapubizifokokovuten.pdfIn PDF document text
    • https://cradlegold.com/wp-content/plugins/super-forms/uploads/php/files/h9tk8ihvevdct0rmes24gi0bf5/47137911769.pdfIn PDF document text
    • http://sallytour.com/FileData/ckfinder/files/20210912_5F5C4936ECE8ECD4.pdfIn PDF document text
    • https://hkparkkonutlari.com/image/files/13813878392.pdfIn PDF document text
    • http://homeopathyhk.com/files/binozuvujunidu.pdfIn PDF document text
    • https://motecx.com/images/file/54999140935.pdfIn PDF document text
    • https://psychologgia.pl/Upload/file/76906524564.pdfIn PDF document text
    • http://zhouzhuanx.com/v15/Upload/file/20219741883287.pdfIn PDF document text
    • https://eletroluz-al.com/_IMG/img_internas/file/dowira.pdfIn PDF document text
    • http://kaiyudachem.com/filespath/files/20210910181141.pdfIn PDF document text
    • http://urduhadith.org/survey/userfiles/files/18421319450.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_off0000dcbd.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xDCBD 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1
font_01_sfnt_off0000f4cf.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF4CF 17816 bytes
SHA-256: 9d781abe36c5609c1f6a695d0165c5d6acf929cbbcd7454f14b6613b3efb5ebc
font_02_sfnt_off000122a7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x122A7 10828 bytes
SHA-256: 307d024d563c1db574156d9057e7819e1df1694e2557755775be12542d13628d

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